N804RV
Well-Known Member
Just did a warm compression check on my Sonerai's 1835.
1 through 3 were great! 78/80 on all three. And the bore scope showed a nice donut pattern on the exhaust valves.
#4 was 60/80 with audible hiss from the intake valve (yes intake valve, not exhaust) The bore scope didn't turn up any obvious damage to either valve face. But, I stuck the scope down the intake runner and saw what looked like scratches at the top of the valve seat.
The engine runs really strong and hand props on the third blade every time. I'm thinking about lapping the intake valve in place to see if I can get a better seat on it.
Has anyone else seen this? How did you deal with it?
1 through 3 were great! 78/80 on all three. And the bore scope showed a nice donut pattern on the exhaust valves.
#4 was 60/80 with audible hiss from the intake valve (yes intake valve, not exhaust) The bore scope didn't turn up any obvious damage to either valve face. But, I stuck the scope down the intake runner and saw what looked like scratches at the top of the valve seat.
The engine runs really strong and hand props on the third blade every time. I'm thinking about lapping the intake valve in place to see if I can get a better seat on it.
Has anyone else seen this? How did you deal with it?
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