Been running the car hard for over 5k with the SC and I knew in the back of my mind the engine might be getting tired as last rebuild was done I would say 20k ago based on my buddy who owned it. Sooooo, did a compression test and got the following reading - 100 psi - across all cylinders (which is good for consistency) some say too low, but, I think was the same the first time (again could have been an issue back then) I did it with SC in but I know before it was @120 - keep in mind the stats - (rookie calculations but I give a +/- error rate on my end) you decide how much,,
Pre SC - 2019
9.7 Compression
120 psi across all cylinders
With SC - 2023
Dry
7.6 Compression (used Turbo Phil calculation)
100 psi across all cylinders
Wet
From left to right looking at the engine
120-190-150-110 (gulp)
Seems a consistent 20% reduction (I think this is what it was before) and wondering if makes sense due to compression plate and 2 BK450 gaskets which equates to 16.6 cc which is considerable reduction - 8.2 cc/decompression plate - 4.2 cc each BK450
So, today gonna hit the car with my trusty and cheap leak down test and see what range she comes in at - hopefully all good as really wAs not planning a rebuild this spring but up to the challenge.
Thoughts
Note - DAM2886 box and lately a little leak from the back of the engine every once in a while that I will be damned if I can locate it - gulp!
Edited by postve, 11 November 2023 - 03:25 PM.
