Hi All!
Just completed the 4th flight in my RV-7 on Sunday and experienced some variation in engine power that I hadn't before. It was very subtle actually, but I could sense by the sound of the engine and just feeling the acceleration / deceleration that the engine power was surging at times. Hard to detect in terms of engine RPM change, maybe around 50 RPM. After feeling it a few times I decided to head back to the airport to be safe.
I downloaded the engine data (below) and I noticed that on previous flights the EGTs for all cylinders were all very consistent (within maybe 30 deg of each other and tracking nicely). On this last flight cyl 1 and 2 were much higher than 3&4 for most of the flight. Occasionally they would come down to match the others for a brief period and then diverge again. First thing that comes to mind is an ignition issue. Perhaps one of set of plugs on cyl 1 and 2 weren't firing all the time, because that would cause an increase in EGT. Other thoughts?? Thanks in advance.
New Superior IO-360
1 LightSpeed II+ ignition
1 Slick Mag
Catto FP Prop
Flight 3 (no issue detected)
Flight 4
Just completed the 4th flight in my RV-7 on Sunday and experienced some variation in engine power that I hadn't before. It was very subtle actually, but I could sense by the sound of the engine and just feeling the acceleration / deceleration that the engine power was surging at times. Hard to detect in terms of engine RPM change, maybe around 50 RPM. After feeling it a few times I decided to head back to the airport to be safe.
I downloaded the engine data (below) and I noticed that on previous flights the EGTs for all cylinders were all very consistent (within maybe 30 deg of each other and tracking nicely). On this last flight cyl 1 and 2 were much higher than 3&4 for most of the flight. Occasionally they would come down to match the others for a brief period and then diverge again. First thing that comes to mind is an ignition issue. Perhaps one of set of plugs on cyl 1 and 2 weren't firing all the time, because that would cause an increase in EGT. Other thoughts?? Thanks in advance.
New Superior IO-360
1 LightSpeed II+ ignition
1 Slick Mag
Catto FP Prop
Flight 3 (no issue detected)
Flight 4