![]() |
|
|
|
Registered
|
Performing Compression Test
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?
__________________
1975 911 3.0 Carrera (964 Lookalike Weekender) 1975 911 2.7 (Project) 1979 Ford RS2000 1980 Mini 1275GT 1998 BMW 320i (Daily driver/Reliable Work Horse) |
||
![]() |
|
THE IRONMAN
|
Yes you can...but it is always recommended to do it when the engine is warm if you want an exact reading result.
__________________
1984 911 CARRERA RUBY RED TARGA SW CHIPPED-BURSCH CATBYPASS MONTY FREE FLOW EXHAUST <IN GAS WE TRUST> |
||
![]() |
|
Registered
|
It would be better if oyu could swing a leakdown, I had nominal compression, however I had a 35% leak past the rings.
__________________
2021 Model Y 2005 Cayenne Turbo 2012 Panamera 4S 1980 911 SC 1999 996 Cab |
||
![]() |
|
Registered
|
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.
__________________
1975 911 3.0 Carrera (964 Lookalike Weekender) 1975 911 2.7 (Project) 1979 Ford RS2000 1980 Mini 1275GT 1998 BMW 320i (Daily driver/Reliable Work Horse) |
||
![]() |
|
Registered
Join Date: Jul 2000
Location: So. Calif.
Posts: 19,910
|
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 |
||
![]() |
|
Registered
|
Ok
Thanks for the help all.
__________________
1975 911 3.0 Carrera (964 Lookalike Weekender) 1975 911 2.7 (Project) 1979 Ford RS2000 1980 Mini 1275GT 1998 BMW 320i (Daily driver/Reliable Work Horse) |
||
![]() |
|
![]() |