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Author Topic: fuel grade and comp ratio  (Read 572 times)

Offline mora

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fuel grade and comp ratio
« Reply #15 on: December 27, 2004, 01:58:26 PM »
The lower CR setup might work, but I wouldn't take any chances with the fuel. You can't even detect slight knocking in all cases.
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Offline J_A_B

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fuel grade and comp ratio
« Reply #16 on: December 27, 2004, 03:04:45 PM »
"I'd say anything with 9.5 compression and higher really need the extra octaine.. "

Depends on the engine, too.  The LT1 in my Buick runs beautifully on 87 at a 10.5 ratio.   The Cadillac I owned before the Buick had some 273 cid engine and it would suffer detonation if I tried to run it on regular.  It used a 9.5 compression ratio.  


J_A_ B
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