IdleSurge
Probationary Member
- 17
- 0
- Jul 15, 2015
-
Chicago,
Illinois
Car: 90 Eagle Talon TSI with wiseco 8.3:1 compression pistons. .020 bore. The head is also built with BC272 cams over sized valves, springs, and retainers and held down with arp head studs and an MLS triple layer head gasket.
All tests were done on a cold motor since my small 16g (oil fed from the head) had a thrust bearing failure. I'm thinking it failed because of oil contamination due to the blow by I'm having which is detailed below:
Compression test (Cold): All cylinders read 168-170psi (I did not do a wet test since I got really good results)
Cylinder leakage test (Cold): 10%-11% leakage across all pistons (all of the air is leaking through the valve cover breather hose if I plug the breather hose then the air will then escape out of the turbo oil return line)
No air is leaking out of the intake or exhaust manifold. No bubbling in the coolant. No leaking through adjacent cylinders. Oil dipstick does not pop out during boost (24psi).
Boost leak test: Air only leaking out of the valve cover breather hose. Tested the PCV valve and it was working great... just to be sure i did pull the hose of the pcv valve and blocked it off that way I could be sure that no air is getting into the crankcase via the PCV valve. It will not hold 15 psi for a minute or so unless the breather hose is plugged and once you unplug the breather hose you can hear and feel a ton of air that just whooshes out and it starts to leak pressure from 15psi to 5psi in about 25-35 seconds.
Anyways I'm on here to see if anyone thinks I should do any other tests or if anyone has had similar results.
This is not a PCV valve issue!!
Thanks all
video
All tests were done on a cold motor since my small 16g (oil fed from the head) had a thrust bearing failure. I'm thinking it failed because of oil contamination due to the blow by I'm having which is detailed below:
Compression test (Cold): All cylinders read 168-170psi (I did not do a wet test since I got really good results)
Cylinder leakage test (Cold): 10%-11% leakage across all pistons (all of the air is leaking through the valve cover breather hose if I plug the breather hose then the air will then escape out of the turbo oil return line)
No air is leaking out of the intake or exhaust manifold. No bubbling in the coolant. No leaking through adjacent cylinders. Oil dipstick does not pop out during boost (24psi).
Boost leak test: Air only leaking out of the valve cover breather hose. Tested the PCV valve and it was working great... just to be sure i did pull the hose of the pcv valve and blocked it off that way I could be sure that no air is getting into the crankcase via the PCV valve. It will not hold 15 psi for a minute or so unless the breather hose is plugged and once you unplug the breather hose you can hear and feel a ton of air that just whooshes out and it starts to leak pressure from 15psi to 5psi in about 25-35 seconds.
Anyways I'm on here to see if anyone thinks I should do any other tests or if anyone has had similar results.
This is not a PCV valve issue!!
Thanks all
video
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