compression and cam timing.
 

just a bit of interesting info.
I changed my cam timing on my 930 this week end by .015, retarded.
my compression on number 4 was 130 before, it was 122 after.

just thought it was amazing at how much the compression changed with just such a small amount of cam timing change.

[QUOTE=T77911S;11389143]just a bit of interesting info.
I changed my cam timing on my 930 this week end by .015, retarded.
my compression on number 4 was 130 before, it was 122 after.

Do you know why? Why not the other cyl in that bank at least.

Phil

I only compared 1 and 4 before I change the timing, then did the rest after.

it affected all cylinders,

so are you telling us it was correct before and you intentionally retarded it ? or when you checked it , it was off from spec, so you corrected it ?

hard to tell what is going on from the limited info in your post.

no,
one side was off by .015. #1 had a compression of 120psi, #4 had 130. after #4 was 122.

point was changing cam timing by .015 changed the compression by 8psi.

I just thought it was interesting that the compression changed that much.


if my turbo was not in the way of the left side I might advance and retard the cams just to see how performance was.