Pwebbz28

iTrader: (31)

One cylinder is at 220. Adjacent cylinder is at 120!! 5 of 8 have abnormal psi. Leakdown showed an 80% loss.

Everything looks brand new. Rings look good. Cylinders look good. Heads/valves are fine. Next thing to check i guess is cylinder distortion.

Any ideas?

cambirdracing

iTrader: (4)

If the rings and valves are ok, then it has to be a head gasket. if your cylinders are distorted, then your rings will leak. You can't do a leak down on a engine unless it has been run to break in the rings. Did you do your compression check with the throttle wide open? This will cause abnormal psi if you don't.

Pwebbz28

iTrader: (31)

It has been run on the engine dyno quite a few times up to 8k. Its still at the machine shop. I was just trying to get some insight as to whats going on.

cambirdracing

iTrader: (4)

when you do the leak down, you should be able to hear where the air is coming out of it, example-thru the throttle body, intake valves are leaking, exhaust, exhaust valves are leaking or valve cover breather, rings are bad, radiator, head gasket.

Pwebbz28

iTrader: (31)

No no. Its going past the rings but cant see why it would. Everything checks out.

butler

Were the cylinders honed by machining or hand held drill? What is the ring end gap? Cylinders could be out of round. If it was the head gaskets I believe you would have 0 pressure in the effected cylinders.