I now have 165 hrsTTSN in 2 years on a Mattituck xio-360-M1B. Temps have always been consistent and in the appropriate range. Compressions normal and consistent. Break in was done per factory recommendations. Bore scope looks good and verified with my mechanic. Aero splat separator installed.
Concern has always been from oil on the belly and oil usage of 1 qt/5 hours. Ever since it was new, it can blow out a little oil from the exhaust on startup, sometimes enough to discolor the grass under the plane. No smoke noted on initial taxiing. The more stop and go flying with short hops, the more it loss is noted. On a long 9 hour cross country last week, only used one quart.
At times, I can taxi and idle long enough to switch passengers and get a pretty significant smoking on increasing the throttle to taxi again. Once in burns off, no more smoke.
I hate to start digging into it when it is working and running fine. Any thoughts on the cause?
Could it be pulling oil around the valve stem on closed throttle operations at low rpm? If it is an oil ring, why is it not burning large amounts on cross country?
I think it is cyl #3 as there is some oil backing up into the MP line and a little oil in the cyl on scope.
Any engine guru insight would be appreciated.
PS. See you at oshkosh
Concern has always been from oil on the belly and oil usage of 1 qt/5 hours. Ever since it was new, it can blow out a little oil from the exhaust on startup, sometimes enough to discolor the grass under the plane. No smoke noted on initial taxiing. The more stop and go flying with short hops, the more it loss is noted. On a long 9 hour cross country last week, only used one quart.
At times, I can taxi and idle long enough to switch passengers and get a pretty significant smoking on increasing the throttle to taxi again. Once in burns off, no more smoke.
I hate to start digging into it when it is working and running fine. Any thoughts on the cause?
Could it be pulling oil around the valve stem on closed throttle operations at low rpm? If it is an oil ring, why is it not burning large amounts on cross country?
I think it is cyl #3 as there is some oil backing up into the MP line and a little oil in the cyl on scope.
Any engine guru insight would be appreciated.
PS. See you at oshkosh