because they are less efficient thermally.
probably not affect timing at all.
that is more linked to bore size and chamber design.
dave
> -----Original Message-----
> From: owner-land-speed@autox.team.net
> [mailto:owner-land-speed@autox.team.net]On Behalf Of John Beckett
> Sent: Friday, July 16, 2004 1:07 PM
> To: Land Speed List
> Subject: Octane
>
>
> Question: Why do the low compression (I think 9 to 1) NASCAR
> motors run hotter
> combustion temps then the 12 to 1 motors? Believe the fuel is
> different too as
> the low compression motors may have to run 93 octane and the higher
> compression ones run 110 octane. How would all this effect
> ignition timing, if
> any?
>
> JB
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