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Old 09-06-2012, 07:17 AM
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67Mustang Al. 67Mustang Al. is offline
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AS ss said. Your compression ratio is the dictator for octane rating of the fuel required. You may need to up the octane to around 98+ and alter the ignition timing back until it stops pinging.
We ran 13 to 1 compression in a stroked BMW using ethanol and wrecked a set of JE pistons .
I may be wrong but i think 10.5 to 1 is the limit for 93 octane fuel.
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