Octane Differences
Octane Differences
(OP)
What is the advantage in 91 octane compared to 85.5 octane?
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RE: Octane Differences
You can do a long involved study with various manipulations of the 3 variables of octane rateing, CR and spark advance, but I expect that you will come up with about 9:1 for 91 octane and about 8.5:1 for 85 octane, with both likeing about the manufacturers spec for spark advance
Regards
pat
RE: Octane Differences