Fuel/Water, Bearing/Rust

[Nat Penton]

I have 200+ flights on the OS91FX since early Sept using Boca sealed ( ? )
rear bearing. Can't get 30 flts on stock bearings.Using 30% nitro, do not
run engine dry or use after run. It has been a godsend and the engine still
feels very  smooth. Also installed a six for $15 Tower glow plug and it
performed super with a smoother idle than the high dollar plugs I was using.
----- Original Message ----- 
From: <Vicenterc at comcast.net>
To: <discussion at nsrca.org>
Cc: "Jeff Hughes" <jhughes at hsonline.net>; <discussion at nsrca.org>; "Bob
Pastorello" <rcaerobob at cox.net>; <discussion at nsrca.org>
Sent: Saturday, December 06, 2003 9:11 PM
Subject: Re: Fuel/Water, Bearing/Rust


> I think the reason is that there are very little chance to get burned fuel
in the bearings area in the 4C.  The 2C is more open for combustion gases to
blow back and stay there after runing.  If you run the engine with no nitro
fuel you will clean al residues of nitro and the chances to form acids would
be less.
>
> Vicente
> > so why don't the 4stroke guys have problems? they are running much
higher
> > nitro contents than the two stroke guys (typically)?
> >
> >
> > ----- Original Message -----
> > From: <vicenterc at comcast.net>
> > To: <discussion at nsrca.org>
> > Cc: Bob Pastorello <rcaerobob at cox.net>; <discussion at nsrca.org>
> > Sent: Saturday, December 06, 2003 4:18 PM
> > Subject: Re: Fuel/Water, Bearing/Rust
> >
> >
> > > I remember reading the Mintor instructions.  The instructions
recommends
> > to run the engine with NO nitro if you are not planing to fly again for
more
> > than a week.  Also, I remember many years ago when I flew in Venezuela
with
> > NO nitro and we didn't have bearings problems.  Looks like we need to
find
> > out if Nitro is causing the problems particularly in 2 C engines with
large
> > pipes.  I think the nitro residues condense and form strong acid that
> > attacks the metals.
> > >
> > > Vicente
> > >
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> > >
> > >
> >
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> >
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>

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