Assuming boost is maximized but prevent detonation:
A lower compression piston will allow more air/fuel mixture to enter the chamber and give you higher horsepower at boost. It will also lower horsepower land acceleration before the boost kicks in (likely above 2000 rpm).
A higher compression piston will give you a better “street start” (engine starting at idle), but will limit the total horsepower.
Yea your friend couldn’t bolt on a large blower, but he could safely add a very small one, like a 2p.s.i. before he would need to lower compression. The do have certain blowers that can be configured for low-end boost. http://www.holley.com/HiOctn/TechServ/TechInfo/SCTech.html holley gives some great tech info on blowers. On that site it shows a effective compression ratio chart. Joey, you were wrong about not being able to increase compression on regular pump gas, running a 92 octane I could effectivly run up to “about” 12.0:1 ECR without worry of detonation.
Keep in mind that chart is effective compression ratio not static, and I said you wouldn’t be able to TOO much higher. Not that you were at your upper limit.
I don’t really think i’d bother with a blower only putting out 2psi. Seems like alittle too much effort for minimal gains and you have to remember it takes power to run one.
Also using heads with smaller combustion chambers will increase CR. Pistons with domes that extend into the chambers on the heads increase CR.
It is true that boost will provide better results than more static compression, so it is better to use a lower CR and blow more boost.
nodope4us:
Save your money. Those fuel boosters are a joke. If you wish to really make a different fuel you will need to add a significant volume of something to make a difference. The something you can add to unleaded is xylene and or toluene. It is safe to add upto 30%. For instance 7 gallons of 93 pump gas + 3 gallons of xylene (add about 1 ounce per gallon of additive of oil like Marvels or castor) = about 100 octane unleaded.