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Posted: Wed Aug 06, 2003 3:38 pm
by Bob Ingman
Rick you may get away with 93 octaine on an engine of 8.5:1 CR. Classic symptoms will be pinging and dieseling. An octane booster might make up the diffenence if needed. Good luck. Bob Ingman
Posted: Thu Aug 07, 2003 8:36 am
by JC-ATL
93 should be ample on an engine with compression set that LOW, assuming it's been built so it can breathe.
Posted: Thu Aug 07, 2003 11:12 pm
by Bruce2
You are worrying about nothing. My engine has 8.5:1 CR and I use only 87 octane all the time. I even ran 85 octane when I was in SLC UT.
No problems, no pinging.