Another bearing question....

[Ed Miller]

Throw the Magnum carb in the garbage and fit an appropriate OS or Perry
carb. I've seen nothing but inconsistent machining on them, I bet the
throttle barrel can be rocked back and forth ( side to side ) in the bore at
least 1/8" or more. Ensure the spray bar slit is facing down the carb throat
too, sometimes they are way off.
Ed M.
----- Original Message -----
From: "Dean Pappas" <d.pappas at kodeos.com>
To: <discussion at nsrca.org>
Sent: Friday, October 24, 2003 1:36 PM
Subject: RE: Another bearing question....


> Beats me George ... maybe some time we'll play with it together.
> Dean
>
> -----Original Message-----
> From: george kennie [mailto:geobet at gis.net]
> Sent: Friday, October 24, 2003 1:55 PM
> To: discussion at nsrca.org
> Subject: Re: Another bearing question....
>
>
> Dean,
> Nope! It's an old Magnum and it has terrific compression and doesn't
exhibit any of the attributes of wear.
> As regards the base seal, it seems to me that if the seal is less because
of shaft wiggle, then the transfer charge would be less efficient resulting
in a leaner
> charge which should make the engine run leaner, unless the seal is not as
severly affected at reduced rpm's.If that's true, then maybe that's why it
idles O.K. due
> to inconsequential losses at very low r's. Huh, huh, huh?????
> Georgie
>
> Dean Pappas wrote:
>
> > Hi George,
> > It's a double whammy: the extra heat is bad, but the big killer is the
loss or inconsistency of the base compression seal as the crankshaft
wiggles, in its bore.
> > So what engine has the funny symptom you described? Let me guess, a worn
out YS 60 ...
> >
> > Regards,
> >         Dean
> >
> > -----Original Message-----
> > From: george kennie [mailto:geobet at gis.net]
> > Sent: Thursday, October 23, 2003 2:03 PM
> > To: discussion at nsrca.org
> > Subject: Re: Another bearing question....
> >
> > Boy, that blows me away! Somebody that's an engine guru please explain
why  a
> > faulty bearing causes the mid-range loading-up problem.
> > I have a 60 size engine that is a few years old that will turn a 12x7
prop over
> > 12K rpm and idles below 2000, and transitions beautifully, but if I run
it up to
> > full power and let it run for about 30 seconds, at which time it sounds
awesome,
> > and then reduce the throttle to 9000 rpm, it will run good for about 5
seconds
> > and then start to load up and will quit, while at this setting after
about 15
> > seconds.
> > It just happens to be sitting on my benchtop with a prop on it and I
just went
> > in and turned it over. The bearing feels smooth, there is no slop in the
prop
> > tips and there is absolutely no end play.
> > Maybe I should keep the bearing and order the rest of the parts to build
up a
> > new engine.
> > Hmmmm, .........still confused.
> > Georgie
> >
> > Wayne Galligan wrote:
> >
> > > My OS will do the loading up in the midrange and die thing.  It has
happened
> > > on the last two bearings thus giving me the warning.  Then of course I
could
> > > verify the end play at the tips of the prop. Funny thing was I
couldn't feel
> > > any roughness.  But after a fresh bearing it ran fine.
> > >
> > > Wayne
> > >
> > > ----- Original Message -----
> > > From: "White, Chris" <chris at ssd.fsi.com>
> > > To: <discussion at nsrca.org>
> > > Sent: Wednesday, October 22, 2003 2:55 PM
> > > Subject: RE: Another bearing question....
> > >
> > > > Thanks Wayne.... The first 2 I would expect, the 3rd is new to me,
and the
> > > > fourth....well that kind of says why we care....:)
> > > > Chris
> > > >
> > > > -----Original Message-----
> > > > From: Wayne Galligan [mailto:wgalligan at goodsonacura.com]
> > > > Sent: Wednesday, October 22, 2003 2:47 PM
> > > > To: discussion at nsrca.org
> > > > Subject: Re: Another bearing question....
> > > >
> > > >
> > > > If you rock the spinner back and forth and it is not smooth or you
feel
> > > > roughness.....bad bearing.   If you grab the prop by the tips and
wiggle
> > > it
> > > > back and forth and there is end play.... bad bearing.  If you
experience
> > > > sudden changes in the midrange like loading up and engine quits on
spool
> > > up
> > > > and plug is OK....possible bad bearing.
> > > >
> > > > Or if you see metal filings coming out the exhaust....... TOO LATE
bad
> > > > bearing and engine.
> > > >
> > > > Wayne G.
> > > > ----- Original Message -----
> > > > From: "White, Chris" <chris at ssd.fsi.com>
> > > > To: <discussion at nsrca.org>
> > > > Sent: Wednesday, October 22, 2003 2:32 PM
> > > > Subject: Another bearing question....
> > > >
> > > >
> > > > > Hi!
> > > > > I hear of guys getting anywhere from 35 to 400 flights on
bearings:
> > > > >
> > > > > What are the first signs of bearing problems. Since starting
> > > Intermediate
> > > > > practice in July, I have just got into flying the same
airplane/engine
> > > > > regularly enough to wear on an engine and tell the difference in
> > > > > performance.  I have 97 flights on a Zen/Webra 145AAR combination.
I use
> > > > > Cool Power 15% and after run oil religiously.  I have a  tach
which
> > > varies
> > > > > so much with light emissions that I deem it as unreliable.  So
what do
> > > you
> > > > > look for?
> > > > >
> > > > >
> > > > > Thanks, Chris
> > > > >
> > > > > -----Original Message-----
> > > > > From: gene.maurice at comcast.net [mailto:gene.maurice at comcast.net]
> > > > > Sent: Wednesday, October 22, 2003 2:07 PM
> > > > > To: discussion at nsrca.org
> > > > > Subject: RE: bearing question
> > > > >
> > > > >
> > > > > Try WWW.AFCBEARING.COM. Great prices and so far a good product.
They
> > > carry
> > > > > all of the standard sizes, but some of them have to be shipped
from
> > > Japan.
> > > > I
> > > > > am using their sealed SS bearing in my OS 160 with the seals and
grease
> > > > > intact. 120 flights (+-) without a problem. And I am using crank
> > > pressure
> > > > to
> > > > > power a Perry pump. This is after going through 2 sets of carbon
steel
> > > > > bearings after less than 35 flights each.
> > > > >
> > > > > --
> > > > > Gene Maurice
> > > > > AMA 3408 NSRCA 877
> > > > > Plano, TX
> > > > > gene.maurice at comcast.net
> > > > >
> > > > > =====================================
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