searched but no luck on compression numbers
 

I'm considering taking my 82 911 (62K original miles) for a compression test. What numbers should I expect to get? I looked all over the web and even on this board and haven't found anything deffinitive. My car runs strong and smooth, with no oil consumption, thogh there is a minor leak -quarter size after sitting for several weeks in my garage.
thanx

What you are looking for is the percentage of difference between cylinders. No more than a 10% difference between the highest cylinder and the lowest.

quick response, thanx Kurt V

I vaguely remember seeing about 140 to 160 psi on good running SC's.

I get 155/160# from my '85 Carrera and about the same from my '76 2.7 with 9.5 JE pistons.
This at 5200 foot elevation. I'd expect another 10 or 15 pounds at sea level.
Unless you are way up in the mountains, I would expect no lower than 150# with a low mileage SC.
Lower than 150# I would run a leakdown to see where it was losing compression.
Good luck,

WOW, does this seem right, or my mechanic didn't actually did the test? 35,45,45,45,40,45 respectively.
these numbers are way too low basing it on what you -good people of this board- are getting.
I believe the test was conducted with the engine cold.
The car runs absolutely great and no oil consumption or leaks -major- detected.
plase advice, and tank you in advanced

those will be other unit numbers probably

my mech told me that it is best to measure compression with more or less warm engine, 100% batteries, all spark plugs removed, and with the pedal pressed down fully.

Jan is probably correct--other unit numbers. The key is the difference between cylinders as Kurt mentioned. Retest at optimum conditions as mentioned by jan, and note differences. As shown, the #1 cylinder (35) is out of spec.

Larry

correction -and less alarmed- the numbers are 130, 140, 140, 130, 130, 135. Are these more or less within acceptance? Since they were going to remove the plugs, I had them replace the spark plugs, and wires (expensive!!!), air filter and oil change. Nice! -for me, not for my wallet.