OST-030: a case in point

[oldeskewltoy]

oldeskewltoy Wrote:Besides the Poncams, my client is using a piston with a 3.2cc dome. He has to check, but believes he has .005" of positive deck - piston slightly ABOVE the blocks surface. He wants to run a squish of .040".

What chamber volume does he need for a 11.3 to 1 compression ratio?


My clients said his head had been already run through the mill once... .008"

Here is what is now known....

82mm bore or 3.229"
77mm stroke or 3.031
.012" piston sticks out of the bore
.052" Cometic gasket
3.2cc piston dome

So I ask again what chamber volume does this build need to have a static CR of 11.3 to 1???

Now how do I achieve that target volume on a head already cut .008", and will be cut an additional .002"????