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08-14-2010 03:35 AM  8 years agoPost 1
Neon Juripuri

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Peculiar Mo USA

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I got the economy bearing kit for an OS .37 from Boca. It has a plastic roller cage.
I also bought a bearing from a guy in my club for my 55HZ with a plastic cage. I didn't use that one and got an OS bearing with a steel cage. I work on cars, and in all cases I can think of bearings with steel cages last way longer than plastic cages.
Does this hold true for RC engines also?
Also I'm not knocking Boca, but where do you guys get your bearings?
TIA Fred

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08-14-2010 03:42 AM  8 years agoPost 2
george0079

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USA

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bearings with steel cages last way longer than plastic cages.
I'm gonna have to disagree with that statement.

I've had extensive experience with both, in the RC industry. I can't say that I've noticed much of a difference between the two.

I'm sure there's some people that disagree with me, too. But, I'm going from my experience. Why spend the $$ for "Better" bearings if you're not going to get any better performance out of them???

Hell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!

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08-14-2010 04:40 AM  8 years agoPost 3
BarracudaHockey

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Jacksonville FL

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Where? RC-Bearings.com

Andy
AMA 77227
http://www.jaxrc.com

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08-14-2010 09:28 AM  8 years agoPost 4
mylee

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Rochester, UK

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Personally, I prefer to fit bearings with the plastic cages. Although I couldn't find one for my 55 recently.

If the cage gives out, and they do, plastic will be much kinder to the internals of your engine. If a metal cage goes, it generally kills most of the internals with it, making an expensive repair.

OS are robbing us blind with the cost of bearings. I still can't understand why a rear bearing for the 55 is more expensive than one for a 50 when they are exactly the same

I think the key here is not to fit so called uprated expensive bearings, but to spot the signs early when a bearing needs replacement. Difficult starting, rattle on starting and using glow plugs are all good indicators.

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08-14-2010 02:08 PM  8 years agoPost 5
Neon Juripuri

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Peculiar Mo USA

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Good point about the plastic being kinder to internals.
But my last bearing failure, a ball split in half and locked up the motor. 1/2 ball wedged on the piston. Luckily it was idoling on the ground when it happened.
I no doubt agree about being hosed by OS. I think the rear bearing for my .37 from OS is right at 40 bucks.
But plastic being easier on the motor is something that slipped my mind. Makes sense to me.
It seems I see guys replacing bearings every 5 gallons of fuel. That sounds like overkill to me. But then again I know what a crash from a motor locking up at the wrong time could cost.
Fred

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08-14-2010 02:18 PM  8 years agoPost 6
mylee

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Rochester, UK

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I see guys replacing bearings every 5 gallons of fuel
That's good, whilst practising for the 3D masters we had one go after just a gallon. Well tuned engine, but flying hard.

You can prelong bearing life, a squirt of air tool oil and dry running at the end of the day will help, but bearings are consumable items.

I've just done my 55 this morning. Front and rear. Front wasn't needed really, rear was shot after 4 gallons

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08-14-2010 04:19 PM  8 years agoPost 7
Thumpernator

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Senoia, Georgia, USA

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Where? RC-Bearings.com
Same here. I strive to have a spare set for every engine I own.

BTW, another symptom of a bearing going bad is decreased power, before having any noise from the bearing. I had that happen last week on an OS 91HZ. I was doing some stall turns and the heli was bogging really bad on the pull-up to vertical. At first, I thought it was either a fuel delivery problem or tuning. Went through the fuel system and didn't find anything, but replaced the fuel filter anyway. That didn't change anything so I tried richer and leaner, both with negative results.

Probably ran 6-8 tanks through it trying to figure it out. Then on an engine start, I heard the familiar "rat-tat" noise of bearing failure. Tore the engine apart that night and the rear and front bearings were notchy. Bearings replaced and power is back to normal.

I've had bearing go bad in my 50 and 55, but never had a noticable power decrease, just the noise.

Anyway, wanted to add the "power" symptom for the archives. I just did a Search and didn't see where anyone had reported that particular symptom. But then again, depending on the keywords used in a search, some things are hard to find. I know,,,, now someone is going to post about 50 links to posts about power loss with bad bearings.

Dave
I keep on thinking, but nothing's happening. Knuk, Knuk, Knuk

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08-17-2010 07:36 PM  8 years agoPost 8
supertigre

rrApprentice

Castle Rock, Colorado

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Plastic retainers
You really don't want to use bearings with steel retainers in the OS heli engines. For some still unknown reason, they will spit that retainer out in pieces and ruin your engine. I have no idea why OS went back to the steel retainer in the 55 after all the problems they had with the 50.

Paul Mcintosh
Owner-CRCustom.com - custom vinyl lettering, banners, signs

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