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OS 55AX Noisy


Old 04-21-2012, 05:38 PM
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Default OS 55AX Noisy

When flying aroud half to quarter throttle i get a noise that sounds like lots of knocks. Some guys say it sounds as if it detonating but the noise is normal. from another post i read was wondering if the same applied http://www.rcuniverse.com/forum/fb.asp?m=9831530
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Old 04-23-2012, 06:05 AM
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Default RE: OS 55AX Noisy

The LA-series of engines do not have crankshafts supported by ball bearings. The AX-series of engines, do. You cannot get noise from the same source. The crank of an AX-series engine should not move around. If it does, then the bearings could be bad. Usually, though, in mid-to-low throttle settings, you get additional exhaust noise caused by unburned fuel exiting the engine and burning in the exhaust port and/or muffler. It will vary, depending upon the exhaust system, fuel used, and propeller. It's common on larger engines, but not unheard of with engines as small as the .55.
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