Alp Sungurtekin 666 Vincent Speedweek SCTA BNI August 8-14, 2020

davidd

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VOC Member
Glen,

Alp has used ball bearing mains on most of his builds. On the Vincent, it keeps the races from moving around.

Alp 03(1).jpg


Alp 06.jpg


David
 

davidd

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VOC Member
Here is one of a series of Hoddinott articles in Bonneville Racing News (BRN). The ball bearing use was originally done by Bill Martz. It was one of the later Irving mods, I believe. I think the pistons used were 8:1.

David
 

Attachments

  • 211 BRN Alp.pdf
    4.7 MB · Views: 44

Monkeypants

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We just stake those outer races in, fairly easy to do. It seems to work and you can stay with the high capacity roller. The dynamic load numbers are 35kn for the 1" roller (or 61 kn if you are stuck with a TP porkchop crank and it's big Superblend type bearings, )
vs 22kn for the 1" ball.


The two ball bearings must be up to it, although it would have been only very short full power bursts on the Martz/Auger drag bike.



Glen
 
Last edited:

ray vinmad

VOC Drawings Manager
VOC Member
We just stake those outer races in, fairly easy to do. It seems to work and you can stay with the high capacity roller. The dynamic load numbers are 35kn for the 1" roller (or 61 kn if you are stuck with a TP porkchop crank and it's big Superblend type bearings, )
vs 22kn for the 1" ball.


The two ball bearings must be up to it, although it would have been only very short full power bursts on the Martz/Auger drag bike.



Glen
Less rolling resistance with ballraces.
Ray
 

Monkeypants

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Non-VOC Member
Oil info for above table
"Coefficients of friction for the various types of bearings are based on a reference value of lubricant viscosity of 20 cSt/100SUS at the bearing’s operating temperature. Coefficients of friction for different bearing types are shown in Table III"
 
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