E85 compression ratio boost. Static compression ratio is a fixed value.

E85 compression ratio boost 5*/LB of boost after 10psi and up. 27 -164. My goal was 11:1 compression N/A, but it looks like it will be higher given my chamber Aug 28, 2023 · A blower at a fixed speed ratio should not make more boost if the engine is flowing more with the larger cam. The 15: engine was a EFI car, the other is a carbed car. 3684 (Boost/14. 3:1 compression ratio and boost? Supercharging you can see huge gains with forced induction and high compression. The engine is 12:1. For moderate-boost applications, compression ratio increases actually reduce peak power output at 29. if you run pump gas in your car, the higher compression you go the lower boost you will have to run and less timing. 1 compression, E85,Thitek Heads. Timing is going to have to be pulled regardless to be safe. Jun 2, 2007 · It uses E85 Ethanol that gets squirted directly into the chamber via direct-fuel-injection, thus fooling the engine into behaving as if it's burning 150-octane fuel. 4:1. Has anyone done this before and found a happy medium in compression ratio? I've already purchased the CES kit . Compression shrinks the tuning window and provides very small power gains. It definitely is affected by boost or nitrous. 5:1 compression with 35 psi of boost made max power at about 11. higher compression and lower boost of higher boost and lower compression? ? Reason I ask this is bc I'v read like 10. 0:1. Nov 7, 2021 · Would tuning things be easier if I kept a slightly higher compression ratio and employed lower turbo boost? Let's say this combination wouldn't necessarily be for attaining the biggest hp numbers possible, but rather for keeping the flattest power curve possible from idle to redline even going from Los Angeles to Denver. 1. Jan 26, 2018 · E85 pump fuel offers an anti-knock index (AKI) rating of roughly 100 octane, which is far better than any pump gasoline. 0 x . E85 give or take is 105 octane. I can tell you this much though, there are a number of people running 13:1 static compression ratios on it with cams sizes all over the place. The math says dynamic is 19. Now as some of you may know with road racing you don't want tons of boost hence why my max is going to be 30lbs. 200? I cant believe with that cube and compression you wasnt higher boost. Pump E85. The LT4 boasts a high 10:1 compression ratio, which is nearly a full point higher than the LS9's 9. 18 bar NMEP. 4 liter, 590 hp on e85 dynamic compression, boost pressure, i dunno Jan 24, 2013 · For instance, I currently have a later model car with a 364 CID (6. 8 block is Sep 15, 2008 · Dark Mode; Light Mode; Menu Log in Apr 27, 2010 · compression ratio e-85 + boost. Goals for the car will be around 750-800. There are a ton of guys out there above 9:1. 7)) or 8. 8:1 91 octane and 16psi of boost. 5:1 CR. 5lb lower - RR Manual Belt Tensioner - Metco Idlers - Spec Stage 3+ Clutch - Spec Steel Flywheel - DJWBC Mar 3, 2017 · Will be a e85 street/M1 track. but running 91 and torco. ” Oct 8, 2015 · Our small block used 10:1 static compression and the blower produced roughly 8 psi of boost. Oct 31, 2011 · Who is running boost with upwards of 10. I don't think 10. I was planning on making my next build specific to E85 and was looking to go 12:1 with 25lbs of boost. 5 to 1 static compression. The e85 runs so much cooler you could get away with running a higher compression even with boost. 1 / 13. 2 The Role of Boost in Performance; 1. This might encourage you to raise the static compression ratio, which will make more power. 7 PSI x 9. I was curious what the highest compression ratio I could get away with would be on a pump gas street car. Jul 13, 2019 · on e85 you might get away with it. The car made 1000/1000 on the dyno without meth/water on a 65 degree day this spring. Plugs looked perfect. How much boost/compression are you guys getting away with on e85? Oct 31, 2015 · 455, edelbrock heads, turbo . 4 (16lbs) - Boss 5. It is to be used as a guideline in determining the proper maximum boost level for a specific application. Feb 28, 2011 · You should see if you can find a chart that shows dynamic compression in relation to static compression and boost. 5:1 was ideal. I decked it and milled the head to get 11. 555 BBC profiler 174x heads. This will give you an idea of what happens under boost and also how you should plan your motor for your target altitude whether it is for racing or day to Sep 22, 2016 · Question 1 - What do you think would be a safe street driven compression ratio for pump E85 with the given boost and details? Question 2 - 2618 or 4032 pistons? Any and all help is greatly appreciated! Apr 8, 2012 · I have a 671 and some parts for the build already: a 4-bolt 468cu block, forged rods, crank, blower pistons, Edelbrock aluminum heads, MSD6 w/Boost Retard, compression ratio will be just a shade under 8:1, double cut crank, and I spoke with the guys at Don Hampton Blowers who referred me to Engle cams. To summarize, 10. 150 bar. 1 Optimizing Engine Performance. Upvote 0 Oct 16, 2014 · I am running e85 99% of the time now and would really like to reap the benefits of increasing the compression. 8 or 10. I have heard of people running as high as 16 -1 but that is stretching it imo. Many of them hardly have to think about detonation on E85 until they get to boost levels near 35 psi and up. plus the extra fuel in the chamber will raise your dynamic compression ratio. It's mostly a street car, all mods are in my profile. 5:1 compression on E85 is no problem even at 15 psi of boost. E85-specific built motors seem to start in Nov 15, 2020 · Interesting idea! The stock compression ratio at 12/1 was designed to run on 87 octane with GDI. That compression ratio is off every chart related to boost for a reason. What E85 does allow, is turning the boost pressure way up in turbo- and supercharged cars due to it's resistance to knock. 1 which is actually a pretty good ratio. 5:1, I don't remember, but both worked very well. I know there are several forum members that are running higher compression ratios and Mar 20, 2020 · Generally speaking a stock valve angle SBF with decent compression and good fuel like E85 that is ~105 octane 30* is a reasonable place to start. 5 compression if you are fully building a car and will be running mostly leaded fuels i would not be hesitant to increase the Aug 11, 2021 · how much power do we gain with higher compression? we have all been told that we need low compression when building power adder (supercharged, nitrous and tu Nov 13, 2017 · Looking to see what others are running for compression when running non intercooled Blowthrough E85,converting a tall deck (10. Jan 17, 2016 · Hey everybody, so I'm turbocharging an lq4. . Oct 4, 2024 · JUMP TO TOPIC. My question is if I use e85 keep the boost low or 500whp at max, how long should I expect my engine to last as a daily driver with the occasional pull here and there? May 20, 2023 · The Corkey Bell book tickles on this a little. Advanced or retarded cam timing affects Dynamic compression ratio. My current engine is 10. 2 = 11. Oct 8, 2014 · The higher compression can achieve the same if not more power on a lower boost since the engine makes for more without the s/c naturally aspirated. 10. 1 a/f ratio. May 2, 2018 · depends on exhaust flow and exhaust manifold back pressure and static compression ratio. Tested near 85%. " The above chart is pretty straight forward, but as RCparker said theres other factors too. Nothing radical. 55-60% E85 req’d. 5:1 with iron 8. 5:1 CR, running any boost would be suicidal unless you want to run 100 octane gas everywhere. The plan is to use 93 for the majority of use because of availability here in the Boston area with the occasional trip to the e85 station for more boost. I am not really sure of the implications of this except that with the 9. this pushed the compression ratio up from the cast-piston ratio of 8. 70% to 90% ethanol depending on where its sold since there is no real regulation on E85. 1 / 12. 1:1. 0 x (6/14. 2000 rpm. You have to decide if you want quick transient response or monster HP. 5 calculated usingCR=(Tauto÷Tamb)5÷2 Detonation occurs when you have secondary flame front in the chamber and the two flame fronts collide c16 and other high octane gasoline are proven to work with 14:1 and higher compression ratio engines what is the limit of E85 Feb 6, 2008 · You might be able to get away with it if you tried the E85 fuel instead of the pump gas. May 13, 2006 · Generally I will err on the side of low compression for octane limited builds. Apr 15, 2012 · Off boost the higher compression will make the car less lazy to respond, on boost, it will just make it a handful! My little pony - 1992 Fox 'vert - Ultra Street build in progress. I was always under the impression it was 8-9. Oct 25, 2012 · High boost + High Compression = Needs high octane gas. 4 cu in) — LE5 Ecotec. 2:1. Mar 1, 2015 · I have converted two high compression 347s to E85, one was 15:1 compression ratio 347, the other was around 12:1 to 12. Jump to Latest VY SS Ute Turbo 1004. Dec 28, 2008 · LE9 The LE9 is an E85 compatible version of the 2. My new build!!! Thanks to Kent Irwin the lower the compression ratio, the more boost you can run safely. Dynamic compression ratio is all together different. It shows an OEM Supra with a 16-17:1 compression ratio and the max on pump gas (about 20psi) at 18:1. 5:1 Sep 20, 2022 · I will be running e85 mostly but I still need the ability to run 91 as it is my daily car. Dec 28, 2009 · It'll be alright, if you get a good tune you'll be gravey! It'll take less boost to make good power and it'll help the turbo spool faster. 5 = 139 PSI). 2 BBC 540 H/H 14/71 Tall big and ugly on E-85 Less than a year to go to finish. As a result, it can tolerate the typically destructive combination of high boost plus high compression ratio. You have to know what kind of build you are going after to determine the compression you need. 9 in) and has a compression ratio of 10. 9L whipple @ 20 psi on E85 makes 700rwhp. Each little hit you take in "off boost" power comes with a huge gain in "on boost" power. 5 compression the Boosted Compression Ratio from your Boost of 15 psi is 19. 7)+1)xBoost = Effective compression ratio. Basically you can get more air into the cylinder with less heat by boost then by compression. Rod strength isn't limited by torque, it is limited by internal stress, just like any beam structure. Silver Supra;9125180 said: Aug 10, 2011 · 1- My stock engine EJ255 compression ratio 8. 09 and perhaps switch out the valvesprings to reduce the risk of valve float while I'm there if needed. the example will be E85 at 20psi boost on 6. Mar 29, 2011 · We now run high compression AND high boost. However with Direct Injection it allows about another 1 point higher compression compared to PI based on a explanation above. A lot depends on the tune of the engine. 2 square port heads. I know Bryan (Razorlab) is always saying us E85 guys should really be running higher compression and hes probably right. With e85 you have to raise the timing to lower the EGTs . ill give example for a single turbo with excellent flowing exhaust manifolds and turbo turbine set up. [referencing newer aftermarket turbocharged camaros] Aug 23, 2023 · To calculate actual effective compression ratio you would just take the volume/time divided by revolutions/time to get volume per revolution. 5:1 static compression, 170+/- cranking compression and running on E85. 0:1 to either 9. The cam will help bleed off some of your chamber Boost + increased compression ratio is a bad, BAD thing. You can run it on 93, but will have to seriously retard the timing advance, depending on the actual boost level you wind up with under load and the efficiency of your heads / cam. Sep 16, 2020 · With the aforementioned octane rating of 110-116, E85’s superior knock resistance allows running a much higher compression ratio, further increasing performance. 24 bar NMEP. 8:1 or a 10. Just know the tuning window will be much more critical the higher the boost vs. 8 to 11. no pwr adder Jun 23, 2023 · GE-VVTi compression ratio (calculated): 10. 9L whipple @ 15psi on E85 makes 700rwhp. If you have a high compression ratio, such 9. Just a nice street/strip motor. 1 Understanding Compression Ratios; 1. 5 in) and 98 mm (3. To see what the effect of boost pressure and altitude is on your static compression ratio, simply enter the three variables and the calculator will display the results in a new pop-up window. Feb 14, 2007 · We Made 601 Hp With A 355 With 10:1 Compression And 12 Pounds Of Boost On E85 Gas. At looking at some compression calculators running this scat kit with 62cc chambers that puts the compression ratio around 10. I wana build an 11. Is that too much? I ask because when trying to tune the motor on 93 it made 750rwhp. Bore and stroke are 88 mm (3. Boost is not a major determining factor. Aug 29, 2016 · Back to the OP, here is the simplified formula for determining what the true boosted Compression Ratio is: Original Compression ratio (OCR) + (OCR x Boost / 14. 5:1 static compression + 14psi results in 18. Nov 19, 2019 · For low-boost applications, this chart shows the impacts of a compression ratio change at 15psi of boost. id. Nov 23, 2014 · That also depends upon boost. Any excess ignition retard increases EGTs, up to a very high levels. 6 bore,4. 0 + 3. Sep 4, 2007 · How many pounds of boost can we shove in there with the stock compression of 9. 140 copper spacer & cutring for my gt40r s52 build. 5-15:1? I'm not sure. 3500 rpm. 5:1 so I am sure I would need to change to different pistons, cam, and carb as well. 3. Oct 15, 2013 · E85 loves compression ,timing and boost . You would severely be octane and knock limited. ) are low compression from the factory. and will be doing e85. Mazda runs 13/1 compression and Ferrari as high as 14/1. 5. 5:1 compression? On pump 93? And what cam or dynamic compression ratio are you at? My high compression N/A build just turned into a centri build, and I'm trying to determine the limits of high compression with boost. 0:1 compression ratio, in which I've installed a roots supercharger on, running 7 PSI of boost pressure, and I've put 18,000 very hard miles on the car since then without any problems. Jun 13, 2018 · It seems to match other outputs. Higher CR lowers the tuning window. If this was a normally aspirated engine, you could crank the compression up to 13:1 or perhaps more. I'm currently around 11. Instead, we ran the engine on E85. Jul 30, 2016 · The Effective Boosted Compression Ratio from your Boost of 5 psi is 13. 5:1 and 40psi will work on e85, even up to 12:1. Nov 12, 2022 · N/A compression ratio is not the same as boosted compression ratio. 050 to avoid losing to much low end power. 2 air fuel on 93 octane usually), and keep the compression ratio low (worn out high mileage engine is great). Best of 5. My engine builder sees no concern with that as in "street trim" won't be running much boost. Sep 13, 2023 · Statements like that are worthless without knowing compression ratio and boost. As for others that say forced induction affects either it is not true. 5:1 or more on alcohol or E85. There is just not as much data. Less than 100% E85 DI required to hold MBT ignition at high BMEP – minimizes E85 consumption increasing E85 range. Jul 23, 2009 · Compression ratio and cam are still up for grabs. Dual Fuel E85 DI % sweep, Full Load, 9. max. 7) +1 ) x 9. May 31, 2007 · n octane has a low compression ratio about 4 before detonation and has a low auto ignition 650 degrees, iso octane at 100, has a 12 to 1 compression ration and an autoignition higher than n-octane, but he cannot explain that pure methane has the same 100 octane rating and can go to 12 to 1 compression, but it's auto ignition temp is way above Apr 3, 2011 · Now that the background is over I will get to the question. Better for the street. Not because I want to make it difficult on myself, but to know how to approach Jan 21, 2014 · Would this setup meaning compression ratio give me any issues other than having to under drive the blower. 7 rod aluminum BBC (598ci)over to handle boost (twin turbo),Using a set of SR20 heads worked by slick rick,Hp goals are 1800 max street/strip deal Oct 22, 2013 · I haven't seen many setups with high-compression and boost and want to know if this would be a good combo. 3 CR. Nov 20, 2015 · According to Wusz, even given the cooling effect of E85, his recommendation would be to limit the static compression ratio to 13:1 on a 4. 8-12:1 compression with a . Jul 2, 2013 · Great thing about having compression and boost is that youll have power down low before boost and you wont have to run a lot of boost to make power. This is why most forced induction street vehicles (that don't use direct injection, diesel ect. At 9. It represents the ratio of the cylinder’s total volume to its compressed volume. The E85 tested right at 70% ethanol. May 13, 2018 · For example either a 9. engine, would be to change parts to lower the static compression ratio. IMO, e85 isn't near the free intercooler than methanol is, nor is it as tolerant to the high cylinder pressures. May 31, 2007 · What is the highest compression ratio that E85 is able to run at without undue harm? 5. We run E85 with a 4. Trap speeds in the 1/8th of the miles were consistent in the 93-94mph. static comp timing 8. Obviously the 60cc chambers will be a higher compression ratio. 70-75% E85 req’d for MBT. 2),4. I have thought at times that a 90's dually with a 454 would be a good candidate for SOME boost. If you are serious about the turbo build, pull the pistons, have them machined for 10:1 and let it fly. 7) = 1. 6 690-> 8. 4psi. Feb 8, 2014 · The coyotes have the luxury to change dynamic compression with VCT. but better to be conservative on compression and turn up boost. I had a Cobalt SS turbo and increased the boost a little. 2- The second engine was put together with JE slightly higher compression forged pistons that brought the compression ratio up to 9. The swept volume represents the dynamic volume of the cylinder based on the pistons position when at its lowest (Bottom Dead Center or BDC) and its highest (Top Dead Center or Oct 22, 2021 · I know there is some redundancy here between low compression, E85, and 50/50 water/meth, a/a intercooler and relatively low timing. At first I was going to run 91 octane and run the engine on 7-10lbs of boost. For example 9:1 compression and 32psi of boost with zero degrees of timing is fine on 93 octane fuel at 112*F in an 86x86 engine like a 4g63, 2jz or sr20. However, some of the S2000 builds have had 11:1 static compression with 15-18psi boost and numbers like 23 on E85. 1157 PSI max You can do this for any fuel as long as you know the max effective compression ratio, I'll do C16 and 93 Feb 28, 2013 · If you go with the low comp pistons and use a GE HG, i believe youll have a ratio of 9:5. . The E85 would also get your air charge way cooler. 10 : 1 Nov 20, 2022 · Blower Basics (Part 2): Boost and What You Need to Know - OnAllCylinders "Also, remember that low compression, high boost engines will make more power than high compression, low boost setups. 5:1 motor but it is doable. Another alternative if you still want to run a blower on your 383 c. A BIG thanks to Paul Demer at JCR Chassisworks, the Team Z Motorsports crew, Matt at Darkside Motorsports, and Jon at Midwest Fox Rods. 5:1 or 10. Dec 4, 2013 · Were you spinning that blower max rpm and was it 4. I think e85 is only good up to 14. it offers less lag yet enough room to run decent boost numbers. The careful balancing act is necessary because too much boost on a high compression engine can lead to mechanical issues, while too little can leave performance on the table. Dan Compression Ratio and Boost Pressure Relationship. I have a 9. 44:1 If you commit to 116 octane C16 race gas, you can go wild with compression and boost; If you commit to E85, you Nov 19, 2011 · Your not going to be able to run much boost or nitrous with that high of compression ratio without using E85 or Race fuel. You should be able to run a 7-8 psi blower with a 9:1 static compression ratio and the engine might run fine on 91 octane fuel. 0 + (8. 20% on the street and OD it very little for a boost of 10-15 lbs at the track 69 Camaro chrome moly 25. 12. 27 bar NMEP. Basically I would like to know if the relationship between boost and compression has already been discussed in depth. Sep 27, 2020 · Dart 363, TFS 225's, Novi-2000, Holley EFI running E85 ALONE, no inter-cooler nor meth. Nov 5, 2017 · If I were to do so would I want to run some E85 compression ratio pistions like 10. Notice, the higher the compression ratio increase, the higher the performance gain at these low boost levels. Another buddy of mine, just bought a brand new, larger, Holley HP E85 carb. Dec 12, 2009 · High boost/low compression ratio VS low boost/high compression ratio. for jow. 5:1 or 10:1, you will only be able to run a small amount of boost. 4. Were you running restrictive factory intercooler? I could show you a log off my motor with that x and that b*tch is making more than you even with that big split on cam and 9. Thinking of 10-12#'s with an air/water inter cooled blow through set up? Sep 28, 2023 · E85’s higher octane rating allows for higher compression ratios, so a ratio between 11:1 and 12:1 may be suitable for E85 with boost. 7) +1 ) x engines compression ratio = effective compression ratio So for E85 solving for boost: ( (Boost/14. 5 to 1 compression with e85 and it runs great. 8:5 compression engine with a 2. I was dreaming of building an E85 power plant, with decently high (9. 5:1 compression on our 2013 GT500, and basically the same combo on our 2010 GT500 but 8. I about fell out of my chair. 5 stroke,6. Nov 4, 2012 · Force Fed Mopar wrote:Conventional wisdom has always been go low on static compression to run high boost. 0:1 compression ratio without modifying the internals and how many hp would that be about? My plan would be to convert it from gasoline to E85 (85% ethanol/15% petrol) to avoid detonation and possibly get around some of the european emissions standards May 25, 2001 · With a static compression ratio of 8:1 + 25#s of boost the actual compression ratio is 21. 0 blocks, but a 5. Sep 20, 2022 · Hello, does anyone know how much boost pressure i could safely give a chevrolet 350 with a 9. The compression ratio that is built into your engine is called “static compression. Since mine is more of a street setup, and E85 is not widely available here in NorCal, I need to keep my compression down at 9:1 in case I need to run gasoline on longer road trips. If you are going to use the fuel get what you can out of it. Low static compression/ high boost allows the compressor to move more air (g/sec) than high static compression/low boost before you hit the maximum limit where compression auto-ignition occurs. I'm running 10:1 on my setup and that's fairly common with built motors on E85. I've seen Supras with 30+psi boosts and boosted dynamic compression ratios in the 28-30:1 range. Depends on the cam as well. 3 Which is the same value as the table listed. 5:1, . 5 ( (Boost/14. 020" off then I will be right around 12. Boost Brothers Turbo Kit. “If you have a nine-second bracket car, the enhanced cooling effect of E85 can knock off a half a tenth to a full tenth of a second in comparison to gasoline,” said Benoit. If you have good fuel available, I would up the compression no matter the power adder. Aug 31, 2017 · C6 Forced Induction/Nitrous - Good compression ratio with boost - What is a good compression ratio to run with a procharger set up? C6 z06 plan to do a flex fuel set up but run 93 most the time driving around town. 5 or 10 to 1) compression and boost. 1:1 ratio for 2 years and a ton of hard street miles and now I am moving up to 9. 93 octane, high compression, and boost generally is a bad mix. Yes for sure you will have to watch the amount of timing and boost you run with a 10. If they take 0. You usually want to add 5-6 degrees so 25-26 * WOT is what I'm runing Oct 8, 2014 · Mach 1s have 10. I don't want to spend 20 grand building a motor to hold 30 lbs of boost and use e85. Feb 25, 2019 · Today, the average high-performance street or strip turbocharged four-cylinder race engine sports a compression ratio of 9. Tuning would be very interesting. 6rwhp @ 28psi E85 Ford Escort Mk2 2JZGTE 600rwhp @14 psi Oct 25, 2017 · It already runs 93 octane due to the high compression ratio. 78 : 1 This was figured with a 453 ft above sea level. I have been going through this same thing you are for the past month and I finally setteled on the 10:1 it will be low enough to put some good ol boost too, and it also keeps the compression somewhat high to give it good street manners if being on pump and or e85 Aug 8, 2013 · If so, how much boost, compression ratio and cranking compression? I've got an SBC with 12. But he does mention to never lower the compression ratio so much that you create a slug of an engine in order to boost it. and i still haven't decided what compression ratio to use Nov 21, 2020 · The key is to keep timing minimal, IAT low, plenty of fuel (10. In your case 8 psi would equate to around 13. Aug 2, 2007 · first of all, pump gas and high boost dont go together in the first place. 6:1 and at 30#s of boost it is 24. You get more power by increasing boost than compression ratio. - download Drive Ratio Chart for 13. Wicked street machine that can run 8s. The engine is an air pump essentially. 5:1, with some even running compression ratios as high as 11. 5:1 compression setup, I'm looking at a 9. Edit: see this Effective Compression Ratio chart. 5:1 compression ratio, you get about 139 PSI pressure at TDC when the engine ignites without boost (14. 8:1, but plans on throwing a big turbo in there and has a whole different beast than most of us. 7) So if the OCR is 8. 1 Building new motor trying to figure out max compression people are getting by with. Sep 29, 2009 · 371 PWR stroker, 13. Mar 21, 2024 · Understanding Compression Ratios and E85. 6:1 to a far more aggressive 10. They recommended their HL74-25 Hyd. 55:1 use to make 340-350whp on E85 with 30* of timing and redline. 5:1 because the peak power advantage of lower compression plus boost versus high compression plus less boost. Just trying to figure out what pistons to order Jun 10, 2024 · They're artificial octane boost - for example - I ran a carbureted 1200cc motorcycle engine that the factory claimed had a 9. 5:1 compression and the 2013 makes over 150 more RWHP with 5-6 psi less boost. Stock rotating Assembly. And I use nothing but 93 octane pump gas in it (no Even with E85 it is useful to strip out the extra heat from the charge air, especially at the boost and power levels you are talking. 0L ) fuel injected engine that has an 11. My build will consist of Wiseco piston 9. Nov 25, 2019 · On the performance side, it allows for a higher compression ratio, which boost horsepower. 078 Cometic which will put me down around 10. 039 head gasket. Cylinder pressure is dependent on the cam as well as compression ratio. It certainly makes it easier to blow a motor when people are trying to run the same amounts of boost as you do on a gen 2 motor, tuning and pulley selection have to be made more carefully; and E85 is of course ideal. You simply keep lowering the compression ratio and adding more boost until you reach your goal. I'm looking to get the highest compression ratio on e85 as possible while running at most 30lbs of boost. On gasoline, we would have had to use a very high octane fuel–probably around 115 octane. IMO high compression + boost is the way to go. 0 - BBK Headers with X-Pipe - Magnaflow Catback - JLT High Boost CIA - Gords HE - Metco -3. It measured out at 9. 82 set i had lathed Sep 11, 2016 · The plan is to use 93 for the majority of use because of availability here in the Boston area with the occasional trip to the e85 station for more boost. Aug 14, 2009 · A compression ratio of 14:1 will give the same cylinder pressure as an 11:1 motor with 4psi of boost. Oct 4, 2024 · More boost means more air is forced into the combustion chamber, increasing the charge’s density and, consequently, its effective compression ratio. 0AFR 20psi 16degrees (would likely take 20deg) 1000rwhp Jan 22, 2010 · This motor was originally built to be N/A with a little bit of spray, but I'm thinking about going the turbo route. Jul 6, 2021 · My 410 SBF made nearly 1000hp on the dyno with a 6-71 and 9# of boost. 41) or 8. I Learned the hard way and melted a piston because my EGTs where super high . It raises exponentially for every pound of boost. Looking for info on high boost, high CR, and e85 Oct 12, 2018 · Consider Part Changes to Lower Static Compression Ratio. Thanks for your input in advance. 1:1 compression stock and they're putting down just as much power on the stock internals we are. 1? Would this still play well with the nitrous? Or should I just run some regular 9. If you only want 250wheel, keep the compression and run 5 psi. E85 will require a dedicated E85 style carburetor that has increased fuel volume capacity in order to handle the roughly 25 to 30 percent more fuel required to run E85. Oct 11, 2019 · An engine’s static compression ratio, usually just referred to as the compression ratio, is a function of the engine’s “swept” and “unswept” cylinder volumes. Does anybody know what is considered a safe boost level for an lq4 on stock internals with e85. With a static compression ratio of 9. We Sep 21, 2009 · So with straight E85 and 10 to 1 compression how much boost can I run as DD? Upvote 0. I would like to use a cam with duration of no more than 235/245 I/E at . I have reluctantly concluded, however, that E85 is just not practical. Anytime you cam up it usually makes more power but less boost because boost is just a measure of backpressure in the induction system. com has a good boost/compression ratio chart. Superchargerusa. 7:1. 6 effective compression. You can definitely run higher compression on the 5. For a 2 valve to run 10:1 compression the cams should be spec'd to keep you around high 8:1 and low 9 if you have 93 octane avaliable. 1 and call it a day? Dec 12, 2010 · But, you also have to understand, that when you are talking about the new 5. Has anyone done a build similar to this that the car is ran on e85 and is forced induction? With e85 being a higher octane rating than 91 octane. It just seems like cramming boost into such an engine without lowering the compression ratio and whatever other internal modifications are needed is a recipe for disaster. 0 to 1 compression ratio usable w/6 lbs of boost without have to run excessively rich and backing way off the timing to keep it from detonation? Almost anything will live with 5 degrees of timing and afr of 10:1. 5 to 1. I was looking into a . Someone who is a pump gas guy will generally enjoy his car more on even 8. If was gonna be all out track deal would be different story with much more compression. 03 Cobra - Whipple 3. Jul 8, 2018 · I plan on switching to 317 heads to lower the static compression ratio to 10. This could also cut down on the posibilty of predetnating. 5:1 + 19#s of boost the actual compression ratio is 21. Converting to E85 Fuel. 5 (my engine is stock) = 22. Apr 18, 2011 · e85 is great for compression. Jun 2, 2010 · Well my engine need a rebuild and i've read all the thread I could find in the last month and I still can't decide what compression ratio to go with. 82. e85 single carb 3460 w driver. Quantified effects of higher compression ratios and higher boost on performance and efficiency of knock -suppressed engine: raising boost with engine downsizing has much larger impact. Example 10:1 compression engine with a 2. Dec 27, 2008 · On the dynamic compression ratio and E85 thing, it's hard to say because we haven't been using it for years and years like gasoline. 4:1, the same as the LE5. Hopefully an intelligent person will chime in. 0 compression short block with 70cc heads but mine are 65cc so like said, it would be about 9. 020 over, Boss connecting rods with a stock 4. Jul 7, 2021 · That’s just a guess because we don’t know your cam timing numbers, which can drastically affect your cranking compression numbers. 0 or 10. Just E85. Sep 23, 2014 · Within reason, there really is no limit on power that can be made with pump gas. GEGCalculators GEG Calculators is a comprehensive online platform that offers a wide range of calculators to cater to various needs. 5-9:1 with aluminum. 9mm & 14mm Pulleys; Final Compression Ratio Chart This chart shows the final compression ratio combining the static compression ratio of an engine and the maximum blower boost from the blower system. 6 crankshaft. Stock suspension with road racing shocks. limited at higher speeds. No brackets, MPH limits, clock racing, participation trophies, or Nov 10, 2004 · Use the fomula ((cr/14. I would recommend as I have done, 14. You need more fuel due to E85 being less energy dense, but in naturally aspirated cars it won't make the engine any more powerful. I run e85 I don't worry about detonation, heat or compression I worry about these lame ass 5. 21-131 and 8. E85 or race gas will allow more compression OR more boost. 4 L — 2384 cc (145. On a four stroke you will then divide the displacement by two because it only has an intake stroke every other rotation. Methanol I'd say go for 10:1 - 11:1 max Aug 9, 2017 · Yes 91 only, E85 is not something that every pump has (at least in my area) honestly 9. 5:1 CR boosted engines on 91 octane with "low boost" (were talking 8-10psi max and a really good tune), and a decent amount more boost and timing with e85 or race gas. Jan 26, 2011 · ( (Boost/14. S. Nov 28, 2015 · Today, the average high-performance street or strip turbocharged four-cylinder race engine sports a compression ratio of 9. I want the low end torque off the turbo with good turbo power. 500-600rwhp that dynojet. Jun 30, 2020 · I'd scratch it carefully. 5:1? Fullthrottle went down to 8. Trying to judge if 10. Don't want to go Methanol. 3684 Boost = 20. Mar 10, 2024 · At 5,000 rpm and with turbo boost turned up, the engine made 380 hp and 400 lb-ft of torque on E85, but only 190 hp and 200 lb-ft on E10—in part because the engine was able to run a higher Jan 29, 2017 · compression ratio + {(boost x timing) / intake temp} = octane/engine explosion 93 octane or E85. (boost is greater gain than compression) In other words 8-8. Blower made 19lbs boost at 6500rpm. 3:1. With 9. 1:1 12. 1- 10. Is this too much compression? Dome top pistons, with boost? Will it work?? We gonna find out!------------------------------------------------------------- Apr 21, 2020 · E85 will support high compression and higher boost and power levels because of its superior ability to remove heat from the cylinder. 0 as long as you commit to premium fuel. Aug 10, 2014 · I have a well built 496 BBC and I am wanting to bolt up a procharger to it. 1 with a big turbo on e85 for a 67 mustang with a 4v powerplant. 9. Engine-in-vehicle simulations, with high compression ratio, high boost, and major engine downsizing indicate up to some 40 percent Oct 14, 2011 · Compression ratio required to compress 300K air to 500-> 3. Static compression ratio is a fixed value. 2:1 vs 10:1 not much different but I am using the turbo more. Apr 10, 2013 · not many pistons made for the coyote are offered in that comp ratio and would have to be custom made, and that takes about 4 weeks. My race formula works the same way but is more aggressive and only pulls 0. Reduced E85 requirement when P. So for every number on the compression You start with it makes the boosted comp ratio sky rocket. Oct 30, 2011 · e85 on 11:1 compression. But the more I thought about it, I decided I'm going to set the car up for e85. 9:1 max really? I ran 9. Which power adder you want is on you. 2382 Views 8 Replies 7 Participants Last post by Slowr, Apr 28, 2010. i know its a totaly different motor but here are some testing they did. my friend runs a shop where they mod mitsubishi evos. 5:1 compression ratio. 0L Whipple and 10. Im using a 1. 0l engine's compression ratio, it is only the static compression ratio we speak of. 0/6. MBT May 19, 2013 · Pretty much this. Dec 29, 2011 · The same engine on E85 with a proper tune, could very easily handle boost levels in the high 20 low 30 psi range. A lot of the pro charger and turbo guys are doing it. 3 or 10. 5 compression. 0 and the boost is 6 psi 8. 8:1 and at 23#s of boost it is 24. I've heard that you can run an effective compression ratio of up to 14 on 93 octane. 8 and less boost is more responsive and more torque. 8 to 12. The compression ratio of an engine is a key factor in its design and performance. 3 Timing and Ignition: Keys to Efficiency; 2 Fuel Considerations for High-Performance Engines Jul 25, 2019 · Rhys Millen had his drifing turbo Solistice and was trying to teach Jesse how to drift. 25:1 compression, and it ran just fine on premium pump gas in 1990 when I put it together. A higher compression ratio increases the thermal efficiency of the engine, leading to better fuel economy and power output. Rhys mentioned that his turbo Solistice was making over 525 to the wheels with E85 and 14. if pump gas is your primary choice of fuel, i would stick with stock 8. The gt350 also has 12/1 and PFI but requires premium. May 11, 2011 · So, with my rebuild I am considering swapping compression ratios from the stock 9. 5:1. but destroyed two pistons. 92 with a 9. May 16, 2019 · The higher the compression the lower amount of boost/timing you can run, but the extra compression adds power itself to offset this. 0 850-> 13. Jul 21, 2009 · Boost is more efficient then compression in making power in an octane limited situation. Apr 16, 2019 · Wondering how much compression you can get by with on E70 and E85. 5:1 than 9. (e85, Race gas) High boost + low compression = Needs not so high octane gas(93) Its all about detonation. This allows more advantageous timing settings and less risk of hurting parts. E85 usually makes close to no power difference alone. 8. yes it shortens window for tuning. 7) +1 ) = 2. May 23, 2010 · I am getting ready to for a budget short block build and will running slightly higher compression. I may end up running mild boost eventually, if I can pull the heads off in the car then I could replace the head gasket for a thicker head gasket later to decrease compression ratio. 5:1 effective compression Aug 22, 2014 · So question is. My plan is to run my td05h 20g at 20+ psi on pump (no e85 available here and no meth injection) looking for as close as possible to 400 crank hp. 1 is exceptionally high, especially with forged internals. The compression ratio of your engine has a direct relationship to how much boost you can run. Apr 14, 2022 · 72 Chevelle. 00-inch bore small block and slightly lower in a larger bore engine like a big block Chevy. At 12. Oct 3, 2018 · After seeing the octane rating of E85 being about 112, I’m curious the compression ratios it can handle with boost. However, power isn't being used to drive a supercharger. Will a 226 cam have enough overlap to make 11. fuel capabilites. But it needs careful tuning. 5:1 compression and cams are degreed to spec and are closing to put DCR around 8. My reasons for wanting high compression are for less belt slip (less boost), way more potential if e85 stations start popping up, and add some low end responsiveness that centris lack. I have not personally tried. I'd guess that with the excellent head flow of the coyote motor along with e85 and 14:1 compression that you would be making significant power. Mar 8, 2010 · 10. Maybe not enough to completely answer the question at hand. I have no e85 in the area, so that's not an option. That is as it sets on the bench or in the car, the mathematical formula that determines the volume of space between the cylinder volume and the Head volume (more involved than just that). 5 is a little high but Id personally do it, or run a thicker gasket to lower it just a hair. Maybe a term that would be more appropriate is volumetric efficiency. Atleast thats how ive seen it On street stuff like lsa blower gm cars and whipples etc. Feb 12, 2015 · New tuner for sure :scared003. Feb 27, 2018 · You can get away with 11. Jun 16, 2020 · I'm trying to get more information regarding the max effective compression ratio that e85 can support. Aug 21, 2015 · I run 14. This will work on both gas and e85, best with a flex fuel sensor. Then, keeping the parameters above in mind, adjust the static compression to arrive at a suitable e85 dynamic compression ratio. Oct 22, 2015 · You need to look at your total compression under max boost. 2 has a little less down low ( when the turbo is not being used much) not enough difference to make it worth it to go 10:1 take the safety net on the compression leaves more room to play with. However, I have been reading about a lot of high compression builds lately, and I have gathered that they are using custom cams with later IVC timing to reduce the dynamic compression ratio and therefore be able to run higher boost. eemplx yfyiko hkcmr yertk jyafvdx ymk xubgeeh mtop hmhxb hjjqi