Looking for a little advice for my situation. Car is a M50b25 vanos with a turbo. ARP headstuds and Athena cutring gasket.
Compression tested all cylinders and #2 was low respectively to all other cylinders (200,130,200,220,215,190). So I proceeded to leak down test it and heard it hissing through the turbo manifold. Took it apart as my valve seals were also a bit leaky and car would smoke after idling for a while. Replaced the exhaust valves in cylinder 2, lapped and seated them and put the car back together.
The head was extremely clean and looked basically brand new. No cracks, no blowby from hg, pistons didn’t look burnt or anything, nice crosshatching on the cylinder walls, and overall just clean.
With the car back together now, I compression tested again and same result, 130psi in cylinder 2. I did the leak down test yet again and heard a lot of air in the head (65% leakage) and when I moved the camera over the dipstick tube you really heard it.
So now I’m at my current point of what is my next move
1) New rings in cylinder 2 (I thought about all of them but with their numbers I don’t see why)
2) Replace all pistons/rings (feels like overkill)
3) Buy a spare engine with good compression and swap my head, arp studs, and Athena cutring gasket onto it (have one locally with 180-195 across the board for $400)
Let me know your thoughts and how you’d move forward from here
Compression tested all cylinders and #2 was low respectively to all other cylinders (200,130,200,220,215,190). So I proceeded to leak down test it and heard it hissing through the turbo manifold. Took it apart as my valve seals were also a bit leaky and car would smoke after idling for a while. Replaced the exhaust valves in cylinder 2, lapped and seated them and put the car back together.
The head was extremely clean and looked basically brand new. No cracks, no blowby from hg, pistons didn’t look burnt or anything, nice crosshatching on the cylinder walls, and overall just clean.
With the car back together now, I compression tested again and same result, 130psi in cylinder 2. I did the leak down test yet again and heard a lot of air in the head (65% leakage) and when I moved the camera over the dipstick tube you really heard it.
So now I’m at my current point of what is my next move
1) New rings in cylinder 2 (I thought about all of them but with their numbers I don’t see why)
2) Replace all pistons/rings (feels like overkill)
3) Buy a spare engine with good compression and swap my head, arp studs, and Athena cutring gasket onto it (have one locally with 180-195 across the board for $400)
Let me know your thoughts and how you’d move forward from here
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