08-09-2011, 07:53 PM
Join Date: Mar 2009
Location: Salem, OR
Total Cats: 0
Compression and Leakdown numbers.... need input please!!
So here's the story, my 90 gradually started smoking after I overheated the bjesus out of it one cold morning about a year and a half ago. I just dealt with it for a long time, but it gradually got worse (go figure).
So it got bad enough recently that it was time to start diagnosing. Did a compression test, #2 cylinder was about 120 psi low. The rest were all w/in high end of range. Repeated test wet, no change on #2, so I deduced I had a valve issue. Bought a rebuilt head. Installed that and re tested. Compression great on all cylinders! So i thought i had solved my problem.
But alas, the car was still smoking. So onto culprit #2 - the turbo. Found my outlet pipe full of oil. So turbo seals were shot. Bought new turbo and installed. Guess what? Car is still friggin smoking!!
So other day I bought leakdown tester from HF and tested........ not good......
So my question is this; with the compression numbers I have, and the leakdown numbers, does it shock anyone that I am smoking a quart of oil every 200 miles or so???
1 - 189 dry / 215 wet
2 - 185 dry / 205 wet
3 - 191 dry / 209 wet
4 - 203 dry / 222 wet
1 - 34%
2 - 39%
3 - 31%
4 - 28%
I realize my leakdowns are not good from what I have seen on the boards here, but I'm just curious if I could still have some other problem besides my rings to be losing THAT much oil. I have never seen a spot of water in the oil or vice versa. Car runs great with the new head and turbo, but still putting out the spy hunter smokescreen.
I vented my PCV to atmos, so not losing anything there. My oil pressure reads up around 63ish under hard acceleration, which seems to be "normal" from what I have seen in other posts. Is there anything else i'm overlooking or is it just my rings are so toasted that they are allowing that much blowby?
Any input is appreciated!