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A CRANK PIN TALE
https://ukbeg.com/forum/viewtopic.php?f=8&t=16372		 Page 1 of 1
Author:  WILLYBUELL [ 14 Feb 2013 00:59 ]
Post subject:  A CRANK PIN TALE
here we have left to right ,XB pin, three holes feeding each or the big end roller bearings ,hole orentation at 2 oclock ,fed from the bottom ,a hole for each set o rollers VERY good ,center, normski,s 98 S1W ,one large hole feeding one side of the crank pin and under only one set o rollers ,hole orentention 12 oclock feed from the bottom :shock: : ,right one S N S crank pin two holes and smaller diameter than S1W pin ,better ,hole orentation 12 oclock ,feed from the bottom ,not ideal ,hole orentation idealy is as the XB pin to help hold oil in the crank pin

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Author:  pash [ 14 Feb 2013 06:28 ]
Post subject:  Re: A CRANK PIN TALE
What about hole size? Would the XB one be better designed with a slightly smaller hole to the left and slightly larger hole to the right to offset Bernoulli effect?

Any thoughts about the size of the restrictor at the end of the crank? How is the fit and surface finish between the crank and the bush?
Author:  barney [ 14 Feb 2013 10:30 ]
Post subject:  Re: A CRANK PIN TALE
its been a while but did find this interesting years ago (Hydrodynamic Lubrication)
https://encrypted-tbn1.gstatic.com/imag ... Z1kmAt4Cww

explanation http://www.phy.davidson.edu/fachome/dmb ... cation.htm

therefor Me thinks that the oil supply to the brg is on the non load area and reliant on rotating shaft to drag/ force the oil to the load area at a greater presure . I could be wrong but thats my pennies worth :yup:
Author:  WILLYBUELL [ 14 Feb 2013 12:19 ]
Post subject:  Re: A CRANK PIN TALE
pash wrote:
What about hole size? Would the XB one be better designed with a slightly smaller hole to the left and slightly larger hole to the right to offset Bernoulli effect?

Any thoughts about the size of the restrictor at the end of the crank? How is the fit and surface finish between the crank and the bush?

Interesting what you say regarding hole sizes mat .with regards the size of hole in crank shaft feedig the big end .im an currently building test rig to see if is poss to feed the big end better and reduce the running temp in this area.
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