73 911E - ran a compression test with the following results:
#1 200, #2 145, #3 195, #4 210 #5 180, #6 195
Obviously #2 has a bit of a problem: leaky head cylinder (evident "cough" on hard accelleration and rough running - even after my recent tune up) The question is:
If you did a compression test and NOT a leak down test your heads maybe fine, BUT you may have a problem with the rings? piston? or cylinder?
What you need to do is drop some oil in the cylinder and see if the compression rises, if it does you got a problem, if it does not rise then do a leak down to test the heads to see if the head studs have pulled.
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Yes, it can be a broken ring gland or ring and if the piston comes apart which is aluminum JUST think of all that metal floating around YIKES!
or
If it is a pulled head studs the cylinder is boucing into the heads and the case because it is loose and it will damage the faces including if it is really bad make the piston skirt angle and can break a skirt more $$$$
No matter what have it checked, but one main question how many miles on this motor?????
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Bruno>>
Anytime Bruno
Roy at http://www.motormeister.com