I would like some opinions ( Oh Boy!) about high oil consumption on a fairly new overhauled Titan Eagle IV EX O-361-A1A. When I say new it has about 120 hours but was overhauled in 2004. It has piston oilers and a cam oiler with 9.5:1 cylinders. I bought the airplane, an RV8A, in June with about 80 hours. The prebuy didn't show up anything but you know how that goes.
What I'm seeing is oil use of about 1 quart every 2-2.5 hours. There isn't any significant oil on the belly, the plugs are clean w/o oil fouling, the compressions are good (>70) but what a boroscope found was some oil pooling in 2 cylinders and a slight scratch in one of those cylinders. Now, my mechanic suspects that the engine wasn't broken in well and/or the oil ring in those cylinders aren't seated or possibly installed incorrectly or even broken. His suggestion is to run some mineral oil for 25 hours and see if the consumption changes for the better. If not, then pull the cylinders and send them back to ECI for rehoning or repair. We don't suspect the intake valve guides in this case. Do engines with piston oilers typically use more oil?
Any thoughts from the engine experts out there?
What I'm seeing is oil use of about 1 quart every 2-2.5 hours. There isn't any significant oil on the belly, the plugs are clean w/o oil fouling, the compressions are good (>70) but what a boroscope found was some oil pooling in 2 cylinders and a slight scratch in one of those cylinders. Now, my mechanic suspects that the engine wasn't broken in well and/or the oil ring in those cylinders aren't seated or possibly installed incorrectly or even broken. His suggestion is to run some mineral oil for 25 hours and see if the consumption changes for the better. If not, then pull the cylinders and send them back to ECI for rehoning or repair. We don't suspect the intake valve guides in this case. Do engines with piston oilers typically use more oil?
Any thoughts from the engine experts out there?