O-200 Camshaft
Maybe somebody can help to find my peace after a lot of years, asking hundreds of so called experts and after paying 12k$.......
years ago I rebuild my 2nd PA-18 with a O-200, 0h, freshly overhauled in the US and shipped to Germany. It was mounted in and right the 1st test run showed an abnormality, at full throttle 2100 RPM the engine was running rough and was shaking & stuttering. When I pulled the mixture a little bit it ran smooth and ground RPM was about 2150 with temps in the green arc. Changed Carburetors with different settings, Propellers with different pitch, checked the Primer pump, the gap in the air box, fuel flow, valve springs, mag's etc. nothing at all...............
I contacted the deliverer in the US, with a few words, the 2 brothers at E........ton refused the warranty. I flew the PA-18 for some 150h and finally I had to take off the engine, replace the 2 burned cylinders and it was converted to a C-90-14F and it ran fine after.
I never found out the reason of that symptom, not even the shop who did the conversion could explain that. My thought was, that there was mounted a wrong camshaft as for an engine for industrial use or similar. even if the Camshaft showed the right P/N according the Overhaul manual. Now, after years, reading about the valve overlapping due to a wrong Camshaft.... this could be the reason why!
Had somebody had same or similar problems????
Maybe somebody can help to find my peace after a lot of years, asking hundreds of so called experts and after paying 12k$.......
years ago I rebuild my 2nd PA-18 with a O-200, 0h, freshly overhauled in the US and shipped to Germany. It was mounted in and right the 1st test run showed an abnormality, at full throttle 2100 RPM the engine was running rough and was shaking & stuttering. When I pulled the mixture a little bit it ran smooth and ground RPM was about 2150 with temps in the green arc. Changed Carburetors with different settings, Propellers with different pitch, checked the Primer pump, the gap in the air box, fuel flow, valve springs, mag's etc. nothing at all...............
I contacted the deliverer in the US, with a few words, the 2 brothers at E........ton refused the warranty. I flew the PA-18 for some 150h and finally I had to take off the engine, replace the 2 burned cylinders and it was converted to a C-90-14F and it ran fine after.
I never found out the reason of that symptom, not even the shop who did the conversion could explain that. My thought was, that there was mounted a wrong camshaft as for an engine for industrial use or similar. even if the Camshaft showed the right P/N according the Overhaul manual. Now, after years, reading about the valve overlapping due to a wrong Camshaft.... this could be the reason why!
Had somebody had same or similar problems????