RE: Saito 125 engine bearing failure  
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RE: Saito 125 engine bearing failure - 9/18/2008 12:24:11 PM   
Hobbsy



Posts: 10938
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		I'm with Dave, I've been a happy BOCA customer for 15 years and will continue to be.

_____________________________

"I have gone faster backwards, upside down and on fire than most people have gone at all" Don Garlits

(in reply to XJet)
       Post #: 51

RE: Saito 125 engine bearing failure - 9/18/2008 2:27:31 PM   
mike early



Posts: 368
Joined: 10/28/2007
From: Ashland, KY, USA
Status: offline 		Dang, a lot of nerves (besides mine) have been touched.
I admit, I was frustrated when I disrespected on boca bearings. But damn: 89 dollars and there is 1/16" of axial play and oil being slung around inside my cowling? Maybe the axial play is not a big deal, I don't know. That's why I sent emails to boca, to ask them if this behavior is normal. The play is only present when the engine is warm. I dismantled the engine and was going to put my crashed-involved RC-bearings back in. When removing the rear bearings with heating the case, the bearings fell out. In the other times I've changed bearings in this engine, I've had to knock the case against a piece of wood after heating. Maybe these bearings are too loose, I don't know.

Upon comparisons of the bearings I noted the Boca bearings rotated much much more freely and made no noise whatsoever. The crashed bearings felt a little gritty. I presume I've chipped some stuff in there....

SO...until my new bearings arrive, I've reassembled the engine with boca bearings. It runs fine. The oil inside the cowling I can deal with. (I opted to spend more money on their optional better oil seal...) I still don't know if the axial play when warm is important. But that's the point. I am frustrated that Boca Bearings never even bothered to answer my emails. I consider that piss-poor form. They've lost a customer and if anyone asks me, I'll tell them my experience.


All they had to do is reply to my emails and told me the bearings were supposed to sling oil and move 1/16" when warm. Or, replaced the bearings. Even a go-to-hell is better than completely ignoring me.

(in reply to XJet)
       Post #: 52

RE: Saito 125 engine bearing failure - 9/18/2008 2:57:10 PM   
mofosheee


 

Posts: 146
Joined: 9/26/2005
From: napa, CA, USA
Status: offline 		Paul of RCBearings sells the same bearings that Boca does, but at 1/3 the price. They both distribute excellent Chinese bearings. Some people feel better when they pay more correlating paying money to obtain a better product.

Good luck.

P.S.

The ceramics worked great for me

(in reply to mike early)
       Post #: 53

RE: Saito 125 engine bearing failure - 9/18/2008 3:05:04 PM   
togatoga


 

Posts: 431
Joined: 11/26/2004
From: Singapore, SINGAPORE
Status: offline 		To each their own guys, however, thanks for the info. Most or all bearings that these 2 companies sell come from the far east so there's no question of brand loyalty, neither will any jobs be lost that has already been lost by choosing between the two.
In the end we make our own informed choice and leave it as that, its your own hard earned money and it is each individuals right to buy what he wants and where he wants it from.

(in reply to XJet)
       Post #: 54

RE: Saito 125 engine bearing failure - 9/18/2008 5:57:45 PM   
Hobbsy



Posts: 10938
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		Confused terminology, axial is length wise along the crankshaft centerline and radial circular around the crank centerline. Sorry Mike.

< Message edited by Hobbsy -- 9/20/2008 12:45:07 PM >

_____________________________

"I have gone faster backwards, upside down and on fire than most people have gone at all" Don Garlits

(in reply to mike early)
       Post #: 55

RE: Saito 125 engine bearing failure - 9/18/2008 6:15:58 PM   
mike early



Posts: 368
Joined: 10/28/2007
From: Ashland, KY, USA
Status: offline 		now now. I'd be happy to take photos of my spinner/cowl relationship at each extreme. but you'd say I photoshopped it. BS. whatever.

Maybe the bearing housing is actually moving inside the block. I do not profess to explain how it is happening. I only know I don't like it.... and Boca Bearings could give a rat's ass about it.

Hobbsy, are you the owner of Boca Bearings? Why don't you send me some new bearings, that fit correctly, hell!

(in reply to Hobbsy)
       Post #: 56

RE: Saito 125 engine bearing failure - 9/18/2008 6:26:08 PM   
Hobbsy



Posts: 10938
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		Nope, I'm just a customer but I would have noticed 1/16th inch of slop before I put them in the engine and wouldn't have installed them.

_____________________________

"I have gone faster backwards, upside down and on fire than most people have gone at all" Don Garlits

(in reply to mike early)
       Post #: 57

RE: Saito 125 engine bearing failure - 9/18/2008 6:51:11 PM   
mike early



Posts: 368
Joined: 10/28/2007
From: Ashland, KY, USA
Status: offline 		I am presuming they do not fit correctly and they themselves slide back and forth inside the engine. But only when the engine is hot. Axial play, not radial play. Or vice versa, not really sure of the correct term...the crankshaft will slide in and out 1/16 of an inch. But not when the engine is cold. When cold it is tight.

Maybe...maybe the engine was damaged in the crash and can no longer hold the bearings in place as intended. I'll accurately measure the O.D. of both sets of bearings when my new ones arrive.

(in reply to Hobbsy)
       Post #: 58

RE: Saito 125 engine bearing failure - 9/18/2008 8:12:02 PM   
Hobbsy



Posts: 10938
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		In and out is no biggy, there are lots of engines where the crankshaft can move in and out more than one guy has asked about a knocking sound below 4,000 rpm on some two strokes. I'll have to see if I have any fourstroke that will do that.

_____________________________

"I have gone faster backwards, upside down and on fire than most people have gone at all" Don Garlits

(in reply to mike early)
       Post #: 59

RE: Saito 125 engine bearing failure - 9/18/2008 8:51:59 PM   
mike early



Posts: 368
Joined: 10/28/2007
From: Ashland, KY, USA
Status: offline 		Well then: if it's not a big deal, then maybe I shouldn't be calling anyone bad names....

But still a little disappointed that my extra $ for the better seal option yielded a very leaky front seal... that alone was an extra 20 dollars...

"Ceramic High Performance RC Engine Bearing Kits. Our Ceramic High Performance line of RC Engine bearings have a special heavy duty seal that is designed to cut down on leakage through the front"

(in reply to Hobbsy)
       Post #: 60

RE: Saito 125 engine bearing failure - 9/18/2008 9:46:51 PM   
Flyboy Dave



Posts: 13551
Joined: 3/20/2002
From: San Bernardino County, CA, USA
Status: online
quote:

ORIGINAL: Hobbsy

FBD was right this thing contains a lot of pure unadulterated made up BS.


....yep, thanks Hobbsy. It looks like XJet just wants to name-call and pretend like
he's the only person that ever put a bearing in an engine.

He called me "ignorant"....twice. Imagine that.

FBD.


_____________________________

An engineer says.... "That won''t work".
A mechanic says..."Oh yeah, watch this".
"Old Age, and Treachery will overcome youth and skill".
Revver Bro #4.

(in reply to Hobbsy)
       Post #: 61

RE: Saito 125 engine bearing failure - 9/18/2008 9:55:54 PM   
XJet


 

Posts: 3727
Joined: 3/31/2003
From: Tokoroa, NEW ZEALAND
Status: offline
quote:

ORIGINAL: Flyboy Dave
....yep, thanks Hobbsy. It looks like XJet just wants to name-call and pretend like
he's the only person that ever put a bearing in an engine.

No, but it's very clear you don't understand the basics of bearing metalurgy and therefore aren't really in a position to be criticizing others for their choices or comments.

quote:

He called me "ignorant"....twice. Imagine that.

It wasn't name-calling, it was a statement of fact. The dictionary definition I've got here for "ignorant" is:

uneducated in the fundamentals of a given art or branch of learning; lacking knowledge of a specific field

In this case, that hat fits FBD. It's not intended as a personal insult or slight simply a statement of fact.

It's not a good thing for you tell people that Bocca's bearings are "better" when that opinion is based on ignorance of the facts. People deserve to know the truth, and that is that Bocca's bearings are overpriced and some are actually inferior) when compared to alternatives.

As I said, it's a free world and I've got no problems if people want to waste their money on fancy branding but I think it fair that they do so in the understanding that they're not buying a better product.

(in reply to Flyboy Dave)
       Post #: 62

RE: Saito 125 engine bearing failure - 9/18/2008 10:04:43 PM   
Hobbsy



Posts: 10938
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		That may be what the dictionary says but in the real world it is an insult to call someone ignorant. It looks like a set of Boca chromium steel bearings with full contact seals are about 26 bucks. That's not out of line at all.
My guess is that if Mikes crankshaft didn't move in and out before, then one of his new ones is 7mm in width instead of 8mm.

< Message edited by Hobbsy -- 9/18/2008 10:06:41 PM >

_____________________________

"I have gone faster backwards, upside down and on fire than most people have gone at all" Don Garlits

(in reply to XJet)
       Post #: 63

RE: Saito 125 engine bearing failure - 9/18/2008 10:30:11 PM   
TimC



Posts: 2262
Joined: 1/7/2003
From: Lone Pine, CA, USA
Status: offline
quote:

ORIGINAL: XJet
It's not a good thing for you tell people that Bocca's bearings are "better" when that opinion is based on ignorance of the facts. People deserve to know the truth, and that is that Bocca's bearings are overpriced and some are actually inferior) when compared to alternatives.
As I said, it's a free world and I've got no problems if people want to waste their money on fancy branding but I think it fair that they do so in the understanding that they're not buying a better product.

It sounds like you have done some kind of scientific test using both sources of bearings. Or is this just an opinion? The fact is, since these generic ChiCom bearings lack manufacturer logos, and both vendors source from several bearings makers, any kind of test would be suspect.

(in reply to XJet)
       Post #: 64

RE: Saito 125 engine bearing failure - 9/18/2008 10:44:46 PM   
liquid_TR