Gear Cams...Shaft run-out?
Banned
Joined: Mar 2007
Posts: 3,706
Likes: 7
From: Woodstock, Ont , Can
RE: Gear Cams...Shaft run-out?
ORIGINAL: mtclassic
Ron
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We should never stop learning. I am glad you tried it at a shop to see kind cool when you see it for yourself aint it?
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Yes it is. Logically I can see where one can get the idea of less reading, but once demonstrated as well as a sketch with triangles and hypotenuses (sp?) it all makes sense. What we did was setup an indicator on the milling machine bed at 45degrees and set it to zero. We took a known .125 thick piece of flat and slid it under the indicator probe. At 90 degrees obviously it would read .125, but at an angle it read a lot more. No question about it. Surprisingly even fooled the shop machinist at first when I questioned him about it,but he eventually remembered the theory and set me straight.
Ron
Ron
Road Master
Joined: May 2007
Posts: 851
Likes: 5
From: Mitchellville, Ia.
RE: Gear Cams...Shaft run-out?
I read these and I have to laugh because I'm thinking "if they only knew how much runout they had with the thermal dynamic load on them under operating conditions it would scare them so bad that they would probably quit riding and sell their bikes." I have checked several new SE billet cam plates and they have .0025" clearance to the bushings, I only allow .0012" as a maximum on the R&R cam plates I use on a lot of the builds I do. The way I deal with this is if the crank is more than .003" I recommend that we pull it and true and weld it. If the customer doesn't want to do this I recommend the R&R plate (up to .006" runout) for gear drive cams. The more torque you have the more the flex you have so I'm causious with the over 110 torque builds as to the condition of the crank and the cam plate used. Hope this helps.
Banned
Joined: Mar 2007
Posts: 3,706
Likes: 7
From: Woodstock, Ont , Can
RE: Gear Cams...Shaft run-out?
I agree, it's a piece of spegtti rolling around in there, especially with the sprocket being that far away from the main bearing. Add in some lack of concentricity between the sprockets changing the pressure rate on the chain and it's brutal in there. I choose not to think about it 
It's the classic ignorance is bliss that keeps me climbing back on it.
Ron
It's the classic ignorance is bliss that keeps me climbing back on it.Ron
Stage I
Joined: Jan 2025
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Roll out happens when the two halves of the crank spin. Thats how it creates rollout. Heavy acceleration and heavy deceleration. They need to be welded with the connecting rod pin. And timken bearings are they way to go. It removes end play of the crank. If you a light on the throttle then ok. But since your upgrading Im thinking you want more power.
Seasoned HDF Member
Joined: May 2008
Posts: 21,092
Likes: 12,638
From: South Carolina
Roll out happens when the two halves of the crank spin. Thats how it creates rollout. Heavy acceleration and heavy deceleration. They need to be welded with the connecting rod pin. And timken bearings are they way to go. It removes end play of the crank. If you a light on the throttle then ok. But since your upgrading Im thinking you want more power.
Last edited by Dan89FLSTC; Mar 5, 2025 at 01:32 PM.
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