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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #11  
Old 12th October 2022
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Quote:
Originally Posted by thefrenchowl View Post

They might (just might...) fit OK on the ID and OD with a thou or two play, but will certainly crowd themselves on the PCD and won't turn freely...


Patrick
CPD? crank pin diameter?
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  #12  
Old 12th October 2022
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Brucstoudt,

PCD is an engineering term in industry...

Pitch Circle Diameter...

Generally, refers to a diameter you can't easily measure without numerous calculations but is obvious as soon as you see a drawing of it!!!



Patrick
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  #13  
Old 12th October 2022
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copy that Patrick,thanks.

Last edited by brucstoudt; 12th October 2022 at 22:51..
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  #14  
Old 12th October 2022
Iron Mike Iron Mike is offline
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Much like 22 O/S in place of the standard size 23 in another familiar Ironhead area.
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Old 12th October 2022
needspeed needspeed is offline
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Of course connecting rod rollers and transmission mainshaft rollers both have a pitch circle, but rod rollers don't have the issue of increased running clearance when using oversize rollers like the mainshaft bearing does.

You can hone connecting rods and fit rollers to whatever clearance you want and you always use the same number of rollers as they are separated by a retainer.

Not so with the mainshaft bearing. Using the same number of oversize rollers increases the clearance unless you use one less roller.
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Old 12th October 2022
Rodburner Rodburner is offline
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My mistake. I did not see undersized rollers offered,the crankpin I listed the dim's for was not the pin that came out of the motor ,it was my newun.sorry for that bit of confusion.i believe the "old" pin was smaller on the OD.I am a fabricator by trade and reading mic's is taking a little getting used to.I'm getting some help from the machinists at work. I greatly appreciate all the input from everyone !!
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