Re: Piston Slap?????

["Mr. Daniel P. Grady" <dgrady@mail2.nai.net>]

That looks about right to me except for one point. It is my understanding
that the pistons are slightly oval when cold, not just undersize. I think
this is done so that the expansion of the piston is more predictable than it
would be if the expansion was of a near-perfect circle.
-Dan!!!

>
>It is also my understanding that the pistons are usually designed to be
>undersize for the bore at room temperature, but at steady operating
>temperature they have expanded sufficiently to fit the bore. (This
>certainly makes sense for iron block / aluminum piston, and I guess it
>also works for an aluminum block because the water jacket around the
>bore keeps its temperature well below that of the piston?) Thus piston
>slap is much more likely when cold.
>
>Is that what we're talking about?
>
>- Wallace
>  '87 5kcstq 150k
>