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I'd be suspicious of airframe something. Like trim tab flutter.
Doublecheck the various tail bushings and such. Its an old airframe. A sporadic engine related vibration is either ignition or valve train. Do a mag check at cruise power. Check valve springs. Kent Felkins Engine vibration will usally be steady state "R&A Kyle" wrote in message news:GIsld.3601$d96.2476@trnddc01... First, thanks for all these comments. The roughness is enough to cause a low level of vibration in the airframe; not enough to terminate the flight, but the needles do dance. Another IA, not familiar with this plane, made a short flight and agreed. The roughness is not steady, but rather comes in waves, 3 or 4 seconds of rough followed by a slightly shorter interval of somewhat smoother operation. (I realize this is very subjective.) We systematically changed mix, MP, RPM, carb heat, mags and primer pump (lock/unlock). Roughness appears only above 20 in MP. No correlation with other inputs. "Fly" wrote in message ... How are you perceiving the roughness? How you know the engine mounts are OK? Kent Felkins Tulsa "R&A Kyle" wrote in message news:1HCkd.12833$z_4.9667@trnddc07... Can anyone suggest a cause for a slight roughness in a well maintained O-470 (1958 C-182). The mechanic has checked both mags and harness wires and plugs, installed a rebuild carb and balanced the prop (which required very little correction). In flight checks of carb heat, mags and unlocking the primer pump all show no effect. Roughness appears above 20" MP at any RPM. Engine mount checks ok. Any suggestions would be welcome. R Kyle |
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