Billet cylinder head

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Dr_C, this was the jbs crank pic i remembered

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and a spy photo I took next week in your workshop :D

Blog%20(27).JPG
 
JBS has two sidecarX racing brothers. they have stopped using the barrel rollers as they don't support the crank at all.

they have gone to two rows of the standard roller bearing. 24mm width and no balancer, no sidewall in the cases. the sidewall is in the outer part of the steel ring they fit.

regards

Taffy
 
JBS has two sidecarX racing brothers. they have stopped using the barrel rollers as they don't support the crank at all.

they have gone to two rows of the standard roller bearing. 24mm width and no balancer, no sidewall in the cases. the sidewall is in the outer part of the steel ring they fit.

regards

Taffy
Click to expand...

That would work,
Two bearings on the drive side I presume? would double the axial load limit:cool:
 
New coolers were one the schedule today. Larger cooling area and reinforcements along the sides to prevent the vibrations from causing cells to break/leak.

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Well, I'm not (deliberately) melting aluminium at least!

I just picked up a couple of big end bearings, just in case my dear supplier runs dry (Thanks again, Spanner!). It was no problem ordering SKF PEEK-coated cages through my local bearing shop! They costed a little bit more than 30 USD a piece.

:thumbup:
 
You are welcome DrC,:)

Is there a skf part number?
How many rollers do they have?

Cheers spanner
 
Yes indeed, But I do notice their may be a fault in the design of this bearing from what I can see.
 
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Well, that depends on the clearance for the carrier against the pin. If the id is a tighter fit than the od, then lots of surface on the inside makes sense. But, I get your point!
 
The cage for the big end bearing rotate around the big end pin in an eccentric motion and is subject to centrifugal forces to the square of the rotational speed.
So any clearance and flex will be pushed outwards to the rod surface.

I have only taken two Husaberg crankshafts apart both with bearings similar to the SKF in your photo, Both cages were wearing into the rod surface, one was only just starting the other was very well advanced.

IMO this cage gouging is the major contributor to big end failure.

I have also perched a replacement OEM Husaberg rod and pin which had been upgraded to have the larger flat contact exterior surface, silver plated. I am assuming this was done later to increase the longevity of the bearing.
Someone else may be able to confirm this?
 
that's how i look at it too Spanner although i don't know if that was the progression of design or if one cage just happens to work better than the other, i think coating and weight are very important too

the one in Dr_Cs pic could be made slightly different so that the contact of the cage is outside the contact for the rollers

you would have a slightly wider rod and a wider cage for the same roller width but the rollers would never touch the same bit of the rod as the cage.
 

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