Thread: How much compression have you guys got away with on pump gas?
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Old 10-10-2004, 04:22 AM
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Eljaro Eljaro is offline
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Join Date: Jun 2003
Location: Palma de Mallorca, Spain, ESP
Cobra Make, Engine: Contemporary with 482 KC/SO, TKO600,IRS Jag/AMP, 3.54 Salisbury PL,
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Default Compression
I blew the headgaskets twice with my iron heads with 11.5 compression. Pump gas is all I can get around here, and that at 97 RON with added octane booster. I also blew a lot of money with the two engine repairs needed, because in both cases the metal rim of the gasket found its way to the crankshaft and ruined it.
Now I have a set of DOVE F5 aluminum heads with 9.6 compression and TRW flat pistons. I think that with the better flow and better heat characteristics of the aluminum heads, I did not lose much power with the switch. What I have now is peace of mind, a motor that runs like a clock and a decent idle. 95 unleaded is what I use with no problem.
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