Performing Compression Test

[niall]

I've got my 2.7 engine removed from 1975 P car.

Can a compression test be carried out with the engine removed from the car?

[Zef]

Yes you can...but it is always recommended to do it when the engine is warm if you want an exact reading result.

[Scott R]

It would be better if oyu could swing a leakdown, I had nominal compression, however I had a 35% leak past the rings.

[niall]

What I am concerned about is a damaged valve, the engine was running fine when removed but there was a slight knocking sound.

My guess was that a compression test would easily identify if I had a damaged valve.

[911pcars]

If you suspect a damaged valve, minimize engine rotations. I would perform a leakdown test at this point. Before testing, remove the valve covers and verify the suspected valve is not so bent it is stuck open (valve vs piston = bad).

If okay, manually rotate engine so test cylinder piston is at TDC, end of compression (careful), then do it. If you bent a valve, it'll be pretty obvious where the air leak is.

Sherwood

[niall]

Ok

Thanks for the help all.