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ChadS
05-06-2004 05:53:52
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Re: How High Octane For 10.5 to 1 Motor in reply to Northwest-Tom, 05-05-2004 20:24:02
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Hello! You have to look at how much compression pressure is in your engine. I would say that yes, you need a minimum of 94 octane, I would not recommend pump gas in this case, If your engine has 200psi or less, 94 will run it, if it is over 200 psi, increase the octane up to 98-100. All you have to do is run enough octane to prevent preigntion, and detonation. Actually, octane don't make HP, it controls detonation, and preignition, and too much octane creates contaminates, and rob you of power. It does not burn completly clean. and what is left over in the cyl, is the extra octane and additives that you don't need. Try a starting point of 98, if it starts well, runs without popping, or dieseling after you shut the engine off, you have enough octane in the fuel. Octane is sometimes misleading, some see it as a power booster, it helps a bit, but it is more for a running characteristic in the engine rather that making power. Hope this helps, Chad
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