remedial engine question

[patterndude at comcast.net]

Anthony, didn't give up on the 4 banger already, did you?

--
District 6 AVP
www.aeroslave.com
> 
> After a lot of experience I have concluded that bearing life is highly variable 
> in a stressed environment.  30-200 flights are possible in the same 
> airplane,engine on bearings purchased at the same time.  Factory OS bearings 
> seem to be the worst quality, but there are some that will claim they last 
> forecver.  I am just combining all the input to make a general statement. We 
> can reduce the variability by providing a better operating env.  Our bearings 
> exceed their tolerances at about 250 degrees, which is not that hot, so put a 
> cooling scoop on the front or use cheeck cowls to something to keep air flowing 
> over the bottom of the crank.  Use a low viscosity oil fuel like Magnum or 
> Powermaster special fuel or heli.  Finally, set up fuel delivery to eliminate 
> lean runs toward the end of the tank.  This greatly stresses the engine.  Some 
> top fliers use bladder tank systems.  I just land with 1/3 tank.
> 
> --Lance
> 
> --
> District 6 AVP
> www.aeroslave.com
> > Hi all,
> > Have an RX with about thirty flights. The second day out I noticed a squeak 
> > when turning the prop for restart. Thought something was hitting the 
> > spinner, checked all that and it stopped. Yesterday heard it again and 
> > noticed the bearings feel a little rough. Now hear is the weird part does 
> > this only when hot. When cold feels fine and runs great. I plan on pulling 
> > it apart tonight and changing bearings but pretty disappointed at the short 
> > life.
> > 
> > Any one have similar experience?
> > 
> > Anthony
> > 
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