Low compression on #2 Cyl, valve or ring?

[COstyle]

My S13 blacktop has a serious problem but Im not sure what exactly. Here are my symptoms:

:doh: #2 Cylinder shows 90psi, 1,3,4 show 145+
:doh: *Oil catch can fills up/overflows in a number of minutes of hard driving
:doh: *Found oil on all sparkpulgs (aka in combustion chamber)
:doh: *Exhaust stinks badly (much more than usual) but doesnt really smoke

Can you tell from that if its something in the head or a ring? Also I think my turbo is on its way out, that could be adding to it. Please help :confused:

[statik]

your rings are shot, pour a little oil into the cylinder and then try the compression test again it should go up a bit (mine went from 70->90). Right now your boost is blowing past the rings and taking all your oil with it...time to pull the motor apart =]

[Pstl_pete]

Get a leak down test done and that will tell you exactly where you are blowing by. Its cheap and accurate.