Scott,
You forgot to mention, if you shave the head an appreciable amount,
(anything
over .20 thousands) you must check your valve geometry. If it is only .20
thousands clean-up cut, your geometry is brought "back when you have the cam
re-machined to a normal profile. Anything more for gaining compression has to
be
removed somewhere else in the valve train; ie; shorter pushrods or shimming your
rocker pedastals. Just my thoughts.
Mike MacLean-60 Sprite
Scott & Glenda Meyers wrote:
> Greg Mahney wrote:
>
> > My Sprite has a "low compression" motor ie it is the wrong engine for the
> > car, but it was designed to be a "low compression" version of the A-series.
> > This is evidenced by the engine number which is:
> >
> > 9D-U-L-105729 (the "L" is for LOW")
> >
> > My question is What makes it "low compression". is it the type of head?,
> > shorter stroke? different pistons?
> >
> > Anyone know the answer to this one?
>
> I believe the factory had two different sets of pistons, each with a different
> "dish" creating two different compression ratios.
>
> Aftermarket folks vary pin placement in the psiton as well as amount of dish
> for different compression ratios.
>
> Once can always shave the cylinder head for more compression if you don't want
> to change pistons, but, once shaved, it is forever!
>
> Scott Meyers
> 60 Bugeye 1275
|