Toaday seen a possible buy but have a ciuple of questions.
11 Compression reads about 90 psi on all 4 cylinders. Have read a couple of articles where yhey mention a figure of 77.7kg/cm2 this equates to 110psi. Am I worrying unjustly, all 4 cylinders were well within the 10% tolerance often mentioned.
22 On removing the spark plugs to do the test I noted all 4 were, in my opinion, somewhat sooted up. Now I ssw the car hsd a K&N air filter fitted and quite a small one. Additionally I believe the manual ignition advance/retstf switvh is never touched. Could either of these be the cause of the soot?
Thanks
Dave Thornley