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Old 09-27-2012, 04:00 PM
Xerxes Xerxes is offline
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Location: Tacoma Wa
 
Join Date: Nov 2010
Posts: 24
Mein Auto: 81 323i and 93 525i
I have not grooved the cylinder wall before, I had a 67 VW fastback with an AP race case, Berg counterbalanced crank, oversize jugs, etc, etc, and sucked a valve while drag racing (20 years ago), I heard it before I felt it and shut it down, it left 3 crescent shaped indentations in the piston crown but no pieces broke off and scored the cylinder wall.
I have checked for codes and didn't get any, I haven't done a compression test as someone made off with one of my tool chests and I don't have that equipment at the moment. I know the pressure gauge to do this isn't that expensive but I find it hard to buy the same tool twice when I rarely used the first one, but before I tear it apart I'll scope the combustion chamber and see if I can see any damage, that will also let me know if I should just swap it with the other m-50 engine I have or if a top end re-build is all that's required.
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