remedial engine question

[Jeff Hughes]

You notice the roughness hot first because the oil is thinner when hot!



> 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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