Recently, I have noticed that #2 is warming up, after cold start, about 30* cooler than the other cylinders and this is a new development. I can't find anything related to the baffling that has changed. At higher power settings, the gap closes up to at least close to where I remember it being, relative to the others.
I did a compression check and got 60, where last annual it was 74. Pulled the rocker cover and found the inner intake spring in 5 discrete pieces. Replaced the spring and a few light hits with the hammer broke loose whatever build up I had on the intake valve/seat and compression came back to 72. Presumably the lighter spring force allowed debris to accumulate on the valve or seat. I further presumed the reduced compression was causing the slower warm up.
It seemed to improve a bit on the test flight, but now back to lagging 30* behind the others during warm up. I haven't yet tested compression again to see if it is debris on the valve again.
Looking for input from the brain trust on other potential causes. Recently did a wobble test and all exh valves are in the range.
Larry
I did a compression check and got 60, where last annual it was 74. Pulled the rocker cover and found the inner intake spring in 5 discrete pieces. Replaced the spring and a few light hits with the hammer broke loose whatever build up I had on the intake valve/seat and compression came back to 72. Presumably the lighter spring force allowed debris to accumulate on the valve or seat. I further presumed the reduced compression was causing the slower warm up.
It seemed to improve a bit on the test flight, but now back to lagging 30* behind the others during warm up. I haven't yet tested compression again to see if it is debris on the valve again.
Looking for input from the brain trust on other potential causes. Recently did a wobble test and all exh valves are in the range.
Larry