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HelicopterEngines Plugs Mufflers Fuel › os 50 ceramic bearing failure!
05-03-2005 04:43 AM  12 years agoPost 21
noahb

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Carlasbad, NM

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bearing
Well, I hate to do that as the gentleman that I purchased the bearings thru has exellent prices and others are running his bearings without problems.

I am in the process of switching fuels. I am going to finish my three gallons of coolpower and then switch to magnum. Not that I don't like coolpower, but Magnum was so much cheaper and I had Magnum send me several cases. I ended up paying $16.50/gal for 30% heli fuel and that was shipped. I read on here that many like the magnum fuels.

I don't expect it to solve any problems. I will just keep and eye on the rear bearing. If it fails again, i will switch to a diff. type bearing.

The front bearing did not have one spec of rust on it. Looks brand new.

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05-03-2005 07:52 AM  12 years agoPost 22
Jyrki

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Loimaa, Finland

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You call these ceramic bearings but actually these are only half ceramics. Bocabearing website calls these hybride bearings. These are not corrosion free of course. I

Full ceramic bearings are totally ceramic material and corrosion free.

I think you all knew this but seems like you have forgot.

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05-03-2005 11:20 AM  12 years agoPost 23
noahb

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Carlasbad, NM

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paul
Thanks for the insight on installation of the bearings.

Hybrids, no not an oversight on my part. Just wanted to let people know as there are several that run these type bearings. Thanks for bringing that up as they may clear up any questions one may have.

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05-03-2005 01:09 PM  12 years agoPost 24
Doug

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Port Saint Luice Florida....

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go buy some fully SS bearings.
Not advisable as the fully stainless steel bearings are inferior in strength to steel and most have SS retainers as well, there life will be "short" .

What is the "clock" location of the pitting? (the "top" can be located due to the stain "witness" mark left by the rear transfer port)

Just for information "plane" bearings pressure lubricated have the lowest friction and can operate at the highest RPM but oil must be under pressure and cooled. Areas with marginal or splash lube (two strokes crank case scavenged) must use rolling element bearings. for the most part the the rear ball bearing in our little engines is "over oiled" and that is part of the problem.

First member of Member of Bearings Anonymous

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05-04-2005 12:37 AM  12 years agoPost 25
noahb

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Carlasbad, NM

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clock
Well, just checked the clock position. The pits are dir. at the 6 (bottom) position. Doug, is this caused by engine forces? The rest of the race looks good, just the bottom portion. The heli rest on it's skids, so I would not expect any pooling of oil in any one spot more then the other.

What is your thoughts on this?

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05-04-2005 04:46 AM  12 years agoPost 26
Gearhead

rrMaster

Vt

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Doug, I don't think strength is an issue here, any good high speed bearing in this size should hold-up to 2 HP..

Jim

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05-04-2005 07:15 AM  12 years agoPost 27
Al Magaloff

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12,199 Posts- Enough Time Wasted. See Ya!

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So Jim, what exactly is "any good high speed bearing" made of?

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05-04-2005 03:12 PM  12 years agoPost 28
rckrzy1

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Hurst Texas

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To me a hybrid ceramic bearing would be a total waste of money as
ALL failed bearings I have seen had pitting just like the pictures from
rust and the balls (the steel ones) all looked good.



Wildcat Fuels

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05-04-2005 09:42 PM  12 years agoPost 29
DS 8717

rrProfessor

Here wishing i was somewhere else

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My steel bearings had no rust on them and failed after 4 or 5 gallons of fuel. I replaced them with ceramic (HYBRID ) and they are still going strong way after 5 gallons. I believe like Paul says that they were welded or smeared and caused that failure,ceramic wont do that so they should last almost indefinately. Ceramic....balls of the future.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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05-04-2005 10:15 PM  12 years agoPost 30
rckrzy1

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Hurst Texas

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ceramic wont do that so they should last almost indefinately. Ceramic....balls of the future.
But if the races rust and pit would good are your ceramic balls then?



Wildcat Fuels

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05-04-2005 11:14 PM  12 years agoPost 31
DS 8717

rrProfessor

Here wishing i was somewhere else

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Mine dont rust,i use afterun oil............

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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HelicopterEngines Plugs Mufflers Fuel › os 50 ceramic bearing failure!
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