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Re: ? for randy hall + others about compresion+fue
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Posted by Steve - IN on September 10, 2003 at 14:01:57 from (12.222.30.13):
In Reply to: ? for randy hall + others about compresion+fuel posted by eric on September 10, 2003 at 11:41:03:
eric,
To get max performance, you should match the octane to the compression ratio. Higher compression ratio needs higher octane; lower compression ratio needs lower octane for best performance. From recollection, a M has a C/R in the range of 6:1 to 7:1. The 85 octane at the pump is optimum for the 8:1 cars running around today. Actually, an M will want something around 70 octane, which you could get by mixing white gas or Coleman fuel in the tank. The downside of it is that max performance makes more heat in the combustion chamber than pump gas. The M is around 50+ years old, and probably has straight cast heads, no hardened exh. valve seats. So more heat causes more valve reversion. All in all, I'd use normal pump gas for convenience and add some two stroke oil, run it a bit rich, or some guys add ATF fluid; instead of adding expensive octane booster (when you really don't need more octane -- you're just trying to keep the exhaust valves cool).
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