Hey guys,
Wondering if anyone could help me out with a compression question. I've got a D16Y8 with a stage 1 turbo cam. I did a compression test on it and I've got about 160psi in cylinder #1 and 130psi in #2,3,4.... According to a couple people I've talked to the D16Y8 is supposed to be about 9.6-1 ratio. I was also told that should be around 200-220psi in each cylinder. Would the turbo cam make it lose that much compression? If anyone could clarify it would be appreciated.

Thanks guys.....

 

Anybody???

 

no!

 

Chalk up another d-series to boost...

 

wow!

 

If anything, it should have higher compression, since it likely is supposed to have less overlap than stock, as its only a stage 1 turbo cam. But thats more of a dynamic compression thing, so it shouldn't really affect this reading. Only thing I could imagine is that cam timing is off 4deg, as that would happen with a z6-spec cam in a y8 head (cam gear).

I would imaging the rings are just going bad, as 160 vs 130 is well over a 5% difference. It also depends on how you test it - WOT, 2-5 rotations of the crank (starters usually spin 60rpm) is the usual way to go. Otherwise a sohc with 160 is ~8.5:1 CR.