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January 27th, 2010, 05:06 AM   #1
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SKF v's other bearings ?

Just thought I'd put some info out there that I got from the local SKF dealer here in Bundaberg, QLD. I was getting a bottom headset bearing for my 550 ($33.00AUD) & asked about where the bearings were made. He replied it doesn't matter where they're made, SKF use the same processes to make the bearings. This may not be new news but he did go on to explain that the SKF bearings were all core hardened & others were case hardened. He said that SKF bearings did not lend themselves well to being "smashed on with a hammer " & must be pressed on or damage could/would occur to the bearing.

Apparantly, all other bearings are ok to smash on as they are case hardened & it isn't as brittle as the core hardened bearings.

Anyone care to get in on this....? Could make sense....or could be $hit ?????????
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January 27th, 2010, 02:26 PM   #2
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Re: SKF v's other bearings ?

There are a lot of reasons not to like the SKF

if they can't take impacts as good as the others then its just another scratch against them

the roller end radius is very sharp 1/3rd that of other bearings so when taking end loadings the tendancy to dig in and misalign is worse.

actual problem in the bergs is probably not just misalignment but that misalignment coupled with the rollers contacting the lip on the inner race from crank flex, wandering endfloat or poor engine build. in those situations you have both skewing of the rollers and increased stresses on the roller ends.

although roller to lip contact is not mentioned in the rollway bearing literature they do say that deflection (crank flex) is the worse of 2 evils because of the stresses on the roller ends.

IMHO bigger end radius = longer life in a worst case situation = don't use SKF.

the SKF C3 range is very broad too Ive found some too tight and others too loose still having C3 on them, while other bearings like orangebergs specials can be speced to have exactly 46 microns clearence


ABMA standards state that optimum dynamic capacity C values refer to roller bearing mountings so designed and executed that uniform load distribution over the active roller length is assured. it is further stated that if misalignment is present a reduction in the capacity value should be made.

2 types of misalignment: A location misalignment, and B deflection misalignment.

location misalignment implies misalignment in a plane at right angles to the direction of the load. this type is assocoated with skewing of the rollers on the roller track and resultant distortion of the contact area. location misalignment may arise as a consequence of 2 bearing supports some distance apart being out of line. though very undesirable this type of misalignment is not as serious as deflection misalignment and does not result in large bearing capacity reduction.

Deflection misalignment misalignment in the same plane as the direction of the load. this type is ascocitaed with a tendancy toward digging in of the roller ends on the roller tracks with resultant high stresses at these points. with straight non crowned, cylindrical rollers this condition is much more exaggerated than in designs incorperating crowned cylindrical rollers.

deflection misalignment is encountered when moderate to heavy external radial loads exist on small diameter shafts and/or bearing supports are remote from the point of load application"
with all that I ran the oem vc025 skfs for 170 hrs they looked fine. if everything is spoton, crank runout, endfloat, interference fit in cases and on the crank there isn't really a problem in the 628 engine. the 550 seems to have a more veracious appitite for mains, the local butchers have just got another one in

I use rollway bearings and have one of orangebergs to test.
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January 27th, 2010, 02:33 PM   #3
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Re: SKF v's other bearings ?

bushmechanic when you did those 170 hrs on the orginals was the crank welded?
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January 27th, 2010, 02:58 PM   #4
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Re: SKF v's other bearings ?

no that was 170hrs on the stock setup from the factory including counterbalncer

mains looked like they could go another 100hrs easy

endfloat was 0.5mm crank runout 0.08mm, radial play LHS 0.01mm rhs 0.03mm the RHS one looked better than the LHS.

the endfloat was starting to wander due to the lhs outer moving in the cases, this was resulting in some zero endfloat cold startups that would have seen the mains go I think. everyone should check the endfloat more often than the valve lash. its simple easy check to see if the heart of the engine is ok.

I put 20 hrs on another set of skfs and they looked terrible on the roller ends. the reason was the interference fit of the LHS outer in the cases was less than 0.05mm (measured 0.03) hole got bigger from wear and thermal cycling. bearing outer moved every time the engine was hot, enough zero endfloat cold startups and the bearings are potentially toast.... there is nothing in the cases to hold the outer in place so need 0.05mm interference fit or use loctite 609 or similar on the outers but this decreases the running clearence so then you need to run the 46 micron NTN specials or use C4

the reason I think the misalignment is occouring whhen the roller ends contact the lip is that every failed bearing and picture Ive seen clearly shows where the rollers were running when they failed, hard up against the lip.

the other type of failure where the inner race breaks like weeds rather than spalling is just from lack of lip support but if as wildman says the skfs can't handle impacts...
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January 29th, 2010, 05:29 AM   #5
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Re: SKF v's other bearings ?

Wildman, is that 550 06 i rebuilt for you ages ago still going as i would like to know how many hours my bearings have done now. i know you sold it but thought you may know the buyer. In just looking for feedback.
By the way i need a frame 2004 model on and a swingarm if i can get it. i want a complianced one to register.
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January 29th, 2010, 08:08 PM   #6
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Re: SKF v's other bearings ?

No idea about the old '06 550 ORANGEBERG, the guy that bought it never contacted me again. He was in Melbourne somewhere from what I remember. Never saw him on this site either. Sorry I cant help.
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January 31st, 2010, 02:38 AM   #7
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Re: SKF v's other bearings ?

if you have a name damon let me know? i have many, many contacts from darn sarf!

regards

Taffy
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