when doing a wet compression test, doesnt a large increase indicate worn rings? nominal increase indicates rings are good...

with that said, i vote HEADS!

 

Yep. You would be correct. My bad. (where is the facepalm emoticon?)

Rings would have to be REALLY bad for oil not to have a significant effect. (and that would be obvious by the scoring on the cylinder walls, which is NOT present in this case.)

Replace the heads.

 

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yah but if its only gone from 30 to like 70 that still means there shot right

 

40 psi (133% increase) is quite a bit, i would personally point to the rings.

however i would pull the heads as you'll need to pull them to tear into the bottom end anyhow (if it is indeed the rings), have them inspected and magnafluxed, then go from there

edit: and just to clarify- a significant increase on a wet test indicates bad rings

 

I think he already has the head on that side off? Otherwise, I would recommend doing a leakdown test.... it not only tells you how much of a leak, but, just WHERE it is going.

 

would a crack be noticeable in the leakdown though?

 

If its bad enough. Since he was getting **** poor pressure with a compression test, the leak down test would confirm if it was rings or not. You can HEAR where the air is escaping. One of my favorite tools.

 

head is already off

 

Heres an update

stay tuned this thread is gonna be a rebuild my 360 thread in the next few weeks

let me know if anyone sees anything in these pics that doesn't look right




Cylinder 8


Cylinder 6


Cylinder 4


Cylinder 2



cylinder 8 valves


Cylinder 6 valves


Cylinder 4 valves

Cylinder 2 valves