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Old 05-31-2006, 04:18   #1 (permalink)
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Question Shell 100 Octane ? Can it handle 12.34:1 compression with alloy heads ?

Just used one of those online calculators and got a figure of 12.34:1 compression with the the piston-deck clearance, piston dish cc's, head gasket thickness, etc.

I think this is too much for the 98 fuels, but has anyone pushed the limits of the shell 100 octane stuff yet, would I be able to get away with retarding the timing curve down low (and maybe a bigger cam) ??

I have another pair of heads that worked out 10.58:1 and am tossing up whether to run these and run a better advance at lower rpm or use the higher comp ones (if possible) and retard it a bit ?

What are peoples thoughts ??
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Old 06-12-2006, 11:34   #2 (permalink)
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Re: Shell 100 Octane ? Can it handle 12.34:1 compression with alloy heads ?

4-5% increase in hp per 1 point of compression, so figure out if its worth the trouble to run the near 12.5:1 or the 10.5:1 I would opt for the 10.5:1 on the street with advanced timing events
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