Crank run out
Thread Starter
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Grand HDF Member
Joined: Jun 2007
Posts: 4,599
Likes: 421
From: Lansing mi
My understanding is a crank run out of .006 or more can eat up the oil pump over time, as little as 35,000 ,miles. I'm sure that depends on how hard you ride it.
Last edited by GPHDXLC; May 27, 2024 at 12:06 PM.
Seasoned HDF Member
Joined: Sep 2009
Posts: 17,148
Likes: 6,171
From: SE Michigan
You have decimal point dislexia. It's .006
Thread Starter
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Grand HDF Member
Joined: Jun 2007
Posts: 4,599
Likes: 421
From: Lansing mi
Just a slip up, look at post 3 I had it right. But thanks for highlighting my slip up😁
I fixed it...... But how about my question ??
I fixed it...... But how about my question ??
Last edited by GPHDXLC; May 27, 2024 at 12:08 PM.
Road Warrior
Joined: Sep 2016
Posts: 1,887
Likes: 1,059
From: SE Washington
Seasoned HDF Member
Joined: Sep 2009
Posts: 17,148
Likes: 6,171
From: SE Michigan
Jeez people are so uptight.
Road Master
Joined: Apr 2014
Posts: 1,023
Likes: 380
From: Philly Burbs
I just rebuilt my engine due to eating up my pistons and cylinders and seeing metal shavings in the oil pan (nothing huge, just sparkly bits in the oil). Anyhow, my stock crank runout was .008. I installed an S&S crank/flywheel assembly and am enjoying a runout of .001. The bike is also noticeably smoother.
Club Member
Joined: Mar 2009
Posts: 66,126
Likes: 51,458
From: Niles Canyon Ca.
Yeah, not looking forward to opening my 17 RK and checking the run out when I do the oil pump upgrade. But if it has to come apart I can true it and weld the damn thing myself. Just be a major pain in the ***.
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,930
Likes: 8,033
From: poway
Well, TC or M8 the concept of gear drive is the same. Not considering any benefit from tensioner wear or replacement, gear drive will give a consistent accurate cam timing. For a bolt in cam, no, I don't see the need to spend the money. But with crank up builds using a strong straight crank, high compression, big valves and ported heads, and wanting the best performance that you can get from the motor, gear drive is a part of that.
Scott Palmer did some back to back tests for chain vs. gear and he stated gear drive made a little more power. That would have been in the early 2000's.
Scott Palmer did some back to back tests for chain vs. gear and he stated gear drive made a little more power. That would have been in the early 2000's.
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Road Master
Joined: Mar 2012
Posts: 1,036
Likes: 994
From: Ohio
Back about the same time Blackhills Ken found the opposite was true.. IIRC he was running a HQ cam in a 124 ci Dyna.. He was running a chain and decided that he wanted the gear drive.. After the install, the motor made less power on his dyno.. If took a while but he found that the chain cam was running about couple degrees retarded from the gear cams.. Motor liked the cam retarded better..
One thing that drives me crazy is when degreeing a cam, and measuring both cylinders (Twin Cam), I've learned there can be a few degrees between the two cylinders as well. I try to split the difference if one is too far off.
Intermediate
Joined: Nov 2022
Posts: 35
Likes: 28
From: Southern US
I just rebuilt my engine due to eating up my pistons and cylinders and seeing metal shavings in the oil pan (nothing huge, just sparkly bits in the oil). Anyhow, my stock crank runout was .008. I installed an S&S crank/flywheel assembly and am enjoying a runout of .001. The bike is also noticeably smoother.