what do you think about my compression test results?

[kamaro]

I just made a compression test on all 6 cylinders on my '76 911S with the original 2.7 engine. It came out :

cyl. #1 145 psi
cyl. #2 130 psi
cyl. #3 150 psi
cyl. #4 150 psi
cyl. #5 150 psi
cyl. #6 150 psi

Its low on cyl. #2, but is it too low that I need to rebuild the engine? curious to hear some opinions.

[jjeffries]

My two cents:
- do some reading on compression tests, incl. on adding oil for a wet test
- but a leak down test is what you really need
- I'd also pull the valve covers and check for broken studs (should be obvious)
- if no broken studs, check the adjustment of the valve lash on #2 (and all the others, but #2 is the outlier.
Best of luck, John/CT

[30westrob]

Are you having any issues? If not then I would just drive it and enjoy.
Rob

[DRACO A5OG]

+1 Leak Down,

How do the spark plugs look? #2 vs all.