Could this cause 0 compression

[gearheads78]

I am working on a fresh motor in a car I picked up with excellent compression on 7 clys and none on the 8th. The only thing I can find wrong is the cam is completely flat and lifters are ground down 1/4" basicly I don't think the valves were opening at all in that cly. My thought is as the piston goes down it creates a vacuum and when the piston goes up it fills the vacuum but never creates any positive pressure never moving the guage. Am I on the right track or am I way off base missing something else. Cly, head, gasket, valves, piston, and rings all look good.

[Pro Stock]

Your assumtion sounds right, hate to say it but you should pull the engine and look at everything, you probably will have metal stuck in the piston skirts, scratched cylinder walls and scored bearings, if the skirts aren't real bad you can pick the stuck pieces of iron out of the skirts with a scribe and then Scotch Brite them or have them fine media blasted, make sure that you also Scotch Brite them after the media blast. Maybe you will get lucky but in the long run it will be much cheaper to fix it now rather than later.

Since you said that this was a fairly fresh rebuild I'm going to guess that the cam went flat during break in, let me know if you need advice on how to break in a cam.

Dale

[gearheads78]

Thanks Dale, I do plan on pulling the motor completly apart and breaking in a new cam correctly. This is a car I picked up as is and just trying to fix what they messed up.

My main question has could the flat cam be the 100% cause of the no compression showing on the gage. I'm having a freindly debate with so people telling me it would still show compression on the gage.

[camcojb]

remove the two rocker arms from a different cylinder and test the compression on that one............... :cheers:

Jody

[Pro Stock]

remove the two rocker arms from a different cylinder and test the compression on that one............... :cheers:

Jody
Ditto x2, I have never had the occasion to test this theory but I'm betting that you will see 0 compression.

[Vegas69]

If the intake valve is not opening, I doubt is would have any compression. That being said, I have some advice for you.

1. Buy a steel roller cam. It will save you money in the long run.
2. Block off your oil filter bypass. " " " " " " "