Thread: Is everyone using 91 octane?
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Old 05-23-2008, 11:29 AM
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Quote:
Originally Posted by Andrew View Post
My 7.5:1 CR 1970 VW bus called for 91 at a minimum, and the Alfa CR is a lot higher than
That 91 was likely RON, not PON, and even if it was talking PON, that veedub was air cooled which has a significantly higher running temperature at/in/on the head which would very likely require a higher octane to prevent detonation regardless of compression.

Air cooled vs water cooled isn't a really an equal or even representative comparison truth be told. :shrug:
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