On Apr 30, 12:41=A0pm, spamTHIS...@[EMAIL PROTECTED]
wrote:
> On Apr 30, 12:05 pm, Stan Weiss <srwe...@[EMAIL PROTECTED]
> wrote:
>
> > "M.Burns" wrote:
>
> > > Looking at a nice Pro Street car with 13.5 to 1 compression pistons.
=
=A0It
> > > apparently has been at some statewide cruises, rod runs, etc, so I
kno=
w it's
> > > been driven. My question is, what kind of fuel must the owner be
runni=
ng for
> > > the engine to survive. Heard claim that by retarding the timing
somewh=
at,
> > > pump gas with octane booster works(?) =A0Race fuel? =A0Any ideas
=A0(.=
...from guys
> > > familiar with similar cars or situations). Thanks
>
> > Cast iron or aluminum heads?
> > Camshaft spec.'s
> > Carb or EFI
> > What might also help is what is the cranking compression of the engine
> > (Do a Compression Test)
>
> I know a bit about cars, but not why the ?? about Al heads is
> im****tant- is it the fact it's Al and not cast iron, or just that Al
> heads are likely to be better engineered?
>
> Dave
Aluminum heads shed heat to the cooling system better than do cast
iron. You'd think that this would be a disadvantage, but in a high-
compression engine, it helps to prevent detonation. I have heard as a
rule of thumb that aluminum heads, all other factors being equal,
allow you to safely run a half point more compression on the same
octane fuel than do cast iron.
nate
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