07-16-2003, 10:28 AM
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CC Member
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Join Date: Feb 2002
Location: Las Vegas,
NV
Cobra Make, Engine: Levy Racing built FFR w/351W
Posts: 191
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Not Ranked
Quote:
How to Build Horsepower, Vol. 2 by David Vizard
For the most part, the biggest gain in horsepower from a race gas comes from the ability to utilize compression rations of 11:1 to as high as 17:1.
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Vizard as done a lot of research on fuel blends. Some of the other interesting things he found about different brands:
1. Different brands with the same octane produced different power.
2. Temperature has a great effect on power and different brands are affected AT DIFFERENT RATES. Obviously, the cooler you can keep the intake, the more power you make.
3. When blending fuels, some brands may raise the Research Octane Number significantly, but barely change the Motor Octane Number at all. The R + M/2 value increases, but the Motor Octane Number, which is the level at which most street vehicles run, changes hardly at all. So the fuel's resistance to detonation in service on the road improves little.
4. When blending fuels, a change in specific gravity will require changes in jetting to compensate.
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