I finally had a chance to get the compression tested in my 13B S4 motor. The front rotor is 7.8 - 7.7 - 7.9 bar at 237 rpm. Rear rotor is 6.8 - 6.3 - 6.6 bar at 231 rpm.

So the rear is a little down on compression and the front is fine according to the technician. Any guestimates on how far down on power I am with this low comprerssion rear rotor? Is this terminal or can I run it awhile while putting together another motor?

Steve