scott airshows
I'm New Here
Seeking fuel consumption advice! I'm running a 4-cyl AEIO-360-A1E with a fixed pitch prop. The engine has run great for 700 hrs and all the operating parameters are terrific except for cruise fuel consumption @ approx 2500 rpm has risen from 10.5 gph to more than 14 gph over the past year!! I?ve asked for input from some of the best engine guys in the business and none have been able to even offer a theory about what might be causing it. Before I start spit balling rebuilding components I?m hoping that someone in this forum might be able to offer some direction.
I don?t have an engine monitor so I simply lean in cruise by pulling the mixture until the engine slows and then richening it until the engine runs smooth, and then richen it a bit further. Specifically, the engine will start to run rough when the mixture has been pulled 1.5?. Pushing it in a ?? causes the engine to run smooth, and then I?ll richen it another ?? to operate approx. 50-75 deg rich of peak. The mixture knob positions, EGT and CHT readings have not changed at all since my excessive fuel consumption problem developed.
Compression checks are excellent. The spark plugs look perfect and show no signs of excessive rich running. I don?t smell any fuel and have mounted gopros all over my belly to look for leaks out the vents and can?t detect any leaks. I have no fuel residue anywhere on the exterior of the plane or fuel tank.
Any input would be GREATLY appreciated!!!
Dave Scott
www.scottairshows.com
[email protected]
I don?t have an engine monitor so I simply lean in cruise by pulling the mixture until the engine slows and then richening it until the engine runs smooth, and then richen it a bit further. Specifically, the engine will start to run rough when the mixture has been pulled 1.5?. Pushing it in a ?? causes the engine to run smooth, and then I?ll richen it another ?? to operate approx. 50-75 deg rich of peak. The mixture knob positions, EGT and CHT readings have not changed at all since my excessive fuel consumption problem developed.
Compression checks are excellent. The spark plugs look perfect and show no signs of excessive rich running. I don?t smell any fuel and have mounted gopros all over my belly to look for leaks out the vents and can?t detect any leaks. I have no fuel residue anywhere on the exterior of the plane or fuel tank.
Any input would be GREATLY appreciated!!!
Dave Scott
www.scottairshows.com
[email protected]