"Any opinion/data on running E85 in old, higher compression (9.5 - 10:1) engines? I don't care about fuel mileage, I just don't want to damage my engine."
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Originally Posted by Flieger
That's not high compression. You would be better off with gasoline.
For reference, Mazda's new inline 4 has a 14:1 compression ratio and runs on pump gasoline. It is not turbocharged though. I imagine it would really wake up with E85.
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10:1 is high compression for an engine without knock sensors and electronically controlled spark timing. Spark timing is mechanically controlled by the speed of the engine, period.