TOO many thing come into play:
Air temp
Humidity
Timing curve
38 degrees is pushing it on pump gas with 9:1
load
Chamber design
Doug
At 07:22 PM 1/20/2000 -0500, MWood24020@aol.com wrote:
>In a message dated 1/20/00 4:19:40 PM Pacific Standard Time, TSMIT@isotel.com
>writes:
>
><< So there's a topic worthy of discussion: Assuming we're using a mildly
>zoomy
> cam (let's say the Ford Motorsport E303 or equivalent), what's the maximum
> compression ratio we can run if we're going to use street gas (91 octane).
> Assume the engine will use 38 degrees max timing advance.
>
> Which heads are more susceptible to detonation?
>
> Comments? >>
>
>Common rule of thumb that I've heard from those that "know" (mostly by their
>mistakes) is 9.5 to 1 with iron heads, 10.5 to 1 with aluminum heads. Sounds
>a little high to me, but I guess that's what thicker head gaskets are good
>for...
>Mike
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