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The Science of Compression Ratios for Performance Engines
https://www.musclecardiy.com/performance/science-compression-ratios-performance-engines/#:~:text=Short%20tracks%20frequently%20enforce%20a%209%3A1%20rule%20while,original%20factory%20compression%20ratio%20of%20their%20particular%20vehicle.
The Science of Compression Ratios for Performance …
https://www.musclecardiy.com/performance/science-compression-ratios-performance-engines/
Unlimited drag racing and Bonneville engines often exceed 14:1, while stock class drag racers are limited to the original factory compression ratio of their particular vehicle. Compression-ratio limits can be useful to a degree since they generally dictate flat-top pistons, which encourage efficient combustion while maintaining desirable quench to promote charge …
Tech Talk #8 – Compression Session | Reher Morrison …
https://rehermorrison.com/tech-talk-8-compression-session/
Compression increases the efficiency of an engine by extracting more energy from the fuel that is burned. When we dyno test restricted oval-track engines with 9.5:1 compression, we usually see a Brake Specific Fuel Curve (BSFC) that’s significantly higher than the BSFC for a high-compression drag racing motor.
Performance Tech | Compression Ratio 101 Part:2
https://dsportmag.com/the-tech/education/performance-tech-compression-ratio-101-part2/
While no manufacturer shares their actual compression ratio on its IndyCar engine, the expected compression ratio range for these engines is between 11.5- and 12.5-to-1 according to most sources. In a drag racing application where the boost levels are 50 to 60psi, running a compression ratio in that range would have a lower power output than running a …
How to Choose the Right Gear Ratio for Your Muscle Car …
https://www.motortrend.com/how-to/how-to-choose-the-right-gear-ratio-for-your-muscle-car-or-drag-racer/
The overall First gear ratio with the TH400 and 4.10:1 rear gear would be 2.48 x 4.10 = 10.168:1. But, 10.168 4.70 (to determine the …
Tech Talk #96 – Compression Lesson | Reher Morrison …
https://rehermorrison.com/tech-talk-96-compression-lesson/
An extra .100-inch of valve clearance in a 632ci big-block costs a full point of compression ratio, and that has a major impact on performance. In a typical sportsman drag racing engine, I recommend .075-inch intake valve clearance and …
race engine compression ratio - Don Terrill’s Speed-Talk
https://www.speed-talk.com/forum/viewtopic.php?t=17547
Let me hear your experience about race engine compression ratios and let’s focus on this specific example. I have in the planning stages of construction a SBC with 4.155 bore x 3.562 stroke = 386 CI. It is a high RPM [8500 - 8600] drag race engine on the proper grade of race gas. The engine will have an operating range of about 6300 - 8600 RPM.
Drag Racing Engines Fuel Mixture - Engine Builder Magazine
https://www.enginebuildermag.com/2018/01/fuel-mixtures-drag-racing-engines/
In a normally aspirated drag racing engine with 5 to 1 AFR, over 20 percent extra fuel is supplied for cooling. In contrast, during our drag racing days we ran an AFR of 3.4 to 1 in our high compression, blown methanol Hemi engine. With this ratio, over 85 percent extra fuel is supplied for cooling.
Boost vs Compression: Benefits of High Boost & High …
https://dsportmag.com/the-tech/boost-vs-compression-benefits/
Today, the average high-performance street or strip turbocharged four-cylinder race engine sports a compression ratio of 9.5:1, with some even running compression ratios as high as 11.5:1 or more on alcohol or E85. Modern technology allows our racing generation to get the best of both worlds. High boost pressures with high compression ratios.
NOS and Compression Ratio - Racingjunk Forums
https://www.racingjunk.com/forums/showthread.php?t=25472
A lot of guys around my area tend to run 12 to 1 compression, with race fuel. The nitrous seems to respond quite nicely. On another note, back when my boys were 14 a6 16, I gave them a few bucks to throw a little budget motor together, It was built for the use of nitrous in mind except their budget did not allow them to use forge pistons.
UNDERSTANDING AND MEASURING COMPRESSION RATIOS - Competition Plus
http://www.competitionplus.com/drag-racing/new-products/24957-understanding-and-measuring-compression-ratios
As a result, the .020in difference in compression distance will cause the piston to sit higher in the bore, resulting in a much higher and unwanted compression ratio of around 12.5:1. Savvy piston makers with experience in different race engine categories will tell you that compression is a most intriguing topic—and that having more is not always to your advantage.
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