compression leakdown teat
 

I am the owner of a 1981 911 sc. It has 220000 kms on the engine. I believe that it has never been opened up for any king of rebuild. Just the routine maintenance. I recently had a compression test leak down test done to the car and was wondering if i could get any feedback as to whether i should rebuild. The compression was down to 136psi on cylinders 3&4, i think, and the rest of the cylinders were around 146psi. I was also told that there was a very slow leak on piston 3 abd 4 when they performed the leak down test, but was told that it was quit insignificant. Please keep in mind that this is my first porsche and only paid 10 000 for the car that is fully original.
thank you,
Deron Murray
Montreal.

That's less than a 10% compression difference so I wouldn't worry about the compression results.

You really need some more information to make a decision on the leakdown. Specifically:

1. What was the percentage leakdown and at what pressure did they do the test?
2. WHERE was the leak? (Exhaust, intake, rings)