Posted by DaninKansas on June 16, 2014 at 06:11:45 from (24.248.193.103):
In Reply to: Re: E85 revisited.... posted by oldtanker on June 15, 2014 at 16:31:30:
Actually very few engines ran 11:1 compression back in the 1960s - and those did were the high performance cars and to take advantage of the compression ratio guys were buying aviation fuel to run down the 1/4 mile. The typical v8 and I6 engine in the other 99.9% of the vehicles ran around 8.5:1 to 9.5:1 compression ratio to use cheaper lower rated octane rated fuel.
The Ford 428 CJ ran 10.6:1 and required premium fuel, the typical 390 engine that went in most of the 4 doors and pickups was 9.5:1 and went to 8.5:1 after 1971.
Most engines today run 9.5:1 to 10.5:1 and run on 83 octane.
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