remedial engine question

[Joe Lachowski]

One of the best pieces of advice on long bearing life is to leave the damn 
needle valve alone. Every contest I have been to this year I've seen people 
screwing around with the damn thing trying to get the last RPM out of it or 
trying to adjust for the conditions of the day because they think it is 
necessary. I leave mine a tad on the rich side and leave it alone just like 
I ran my YS's in the past and hopefully don't have to touch it until the end 
of the season or when a bearing change is in order( In my case, just before 
the Nats and the end of the season) . All it takes is one  lean run to do in 
the bearings. Not touching the damn thing reduces those chances.


>From: patterndude at comcast.net
>Reply-To: discussion at nsrca.org
>To: discussion at nsrca.org
>Subject: Re: remedial engine question
>Date: Mon, 25 Aug 2003 16:41:13 +0000
>
>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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