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

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  #21  
Old 9th November 2019
Scott Scott is offline
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Quote:
Originally Posted by rejeanprimeau View Post
Take a mirror and look at your lifter roller, you need about 0.05 inches shoulder for the roller to sit on the cam, the rest can go in the scrap bin. I use a lathe to do it.
You turned the cam on the lathe, or the roller? If it was the lobe, did the machining affect the surface hardness (or am I thinking too much). A little off the lobe would mean less off the case.
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  #22  
Old 9th November 2019
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I had to take some off the lobes. That was 5yrs ago. Used a bench grinder.
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  #23  
Old 9th November 2019
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I clearanced the cases with a dremel with the motor assembled and in the frame. Spent more time with the masking tape than it took to do the grinding in the cases. Tried the dremel on the cam lobes, but that would have taken all day. Bench grinder was the way to go on the cam lobes.
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  #24  
Old 9th November 2019
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Quote:
Originally Posted by Scott View Post
You turned the cam on the lathe, or the roller? If it was the lobe, did the machining affect the surface hardness (or am I thinking too much). A little off the lobe would mean less off the case.
The side of the cam lobe. If you grind, tape up the lobe where the roller rides and tape it very well. One slip up...

Before you grind any lobe, I’d mock it up, cam and lifter, rotate it marked up with some Prussian blue paste or gear marking compound, etc... and be certain where the lifter roller rides.


As long as you go slow with grinding and keep it cool, it should be fine. Cutting with a lathe won’t change anything... unless the operator is an animal.
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  #25  
Old 9th November 2019
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You machine the cam. Hold the cam on the shoulders gear side. Remove a bit of the corner or the full face of the lobe, your choice. You can also clearance with a grinders, just make sure you use a fine wheel and keep it cool.
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  #26  
Old 9th November 2019
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Looks like you have found your answer and you don't need me to search for my buried Qs?
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  #27  
Old 9th November 2019
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Correct, sir. Thank you very much for the offer, though.
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  #28  
Old 23rd November 2019
RicThompson RicThompson is offline
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Things you don't know until your knee deep in it. Stick to the planned outcome. Fabrication and modifications can be intimidating but in reality there's nothing that can't be built. Grind on!
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  #29  
Old 24th November 2019
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Thanks for the encouragement. Thing is, the cam clearancing is the least challenging part of this engine build. I just wasn’t expecting it and was caught off guard. Now clearancing the cylinders for pushrod tubes, and making custom length pushrods is occupying my time. Once the cases are apart again, I’ll deal with the cam chest.
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