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Rod Races

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woody

Posts: 460

Joined: Mon Apr 15, 2002 12:01 am

Location: Wa, USA

Post Fri Nov 10, 2006 11:21 pm

Rod Races

I am looking for oversize rod races for UL. Any supplier info would be appreciated.
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steph

User avatar

Posts: 630

Joined: Fri Feb 21, 2003 1:01 am

Location: belgium

Post Sat Nov 11, 2006 2:16 am

Woody, NOS.parts or J.W.Boon has +001",+002",+005",+010" oversize races in 52100 bearing steel.
Stéph
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amklyde

Posts: 617

Joined: Fri Dec 19, 2003 1:01 am

Location: Wisconsin, USA

Post Sat Nov 11, 2006 9:20 am

Woody, I have used oversize races in Indian rods. I suggest you take your rods to a full service auto shop, have them magnafluxed or Xrayed for cracks and if none are present, have the race holes honed on a precision hone to round and size for .003-.005 interference fit for new races. If you have any money left when they are all fitted and done, take them, with crankpin assembly to your local Cryo guy.
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woody

Posts: 460

Joined: Mon Apr 15, 2002 12:01 am

Location: Wa, USA

Post Sat Nov 11, 2006 6:08 pm

Thanks, guys. I had looked at NOS Parts, but I only looked at UL parts and didn't think to do a search for "rod races". They are listed in the OHV parts section. I will be taking my rods out to be magnafluxed this week and then we will see what the hone says. This will get my motor rebuild back on the front burner.
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woody

Posts: 460

Joined: Mon Apr 15, 2002 12:01 am

Location: Wa, USA

Post Tue Mar 06, 2007 9:17 pm

amklyde, are you sure about the .003 to .005 interference fit? My builder says anything over .001 will split the rods.
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amklyde

Posts: 617

Joined: Fri Dec 19, 2003 1:01 am

Location: Wisconsin, USA

Post Wed Mar 07, 2007 7:10 am

Woody, I'm sure on the spec. Harley originaly sized the rod race openings to 1.8125. OEM, Jims, and Eastern rod races are usually 1.818-1.820. Most race holes become distorted to out of round a couple of thou. In a trued hole .003 to .005 is a good fit. The races collapse considerably, the rod will not split. You may want to find an engine builder with a little more experience, I doubt he has ever rebuilt HD rods.
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woody

Posts: 460

Joined: Mon Apr 15, 2002 12:01 am

Location: Wa, USA

Post Wed Mar 07, 2007 9:40 pm

Amklyde, thanks for the clarification. My builder has been doing this for a long time but has never used oversize races.
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47knuck

Posts: 527

Joined: Sat Apr 02, 2005 1:01 am

Location: Ogden, Utah, USA

Post Tue Mar 13, 2007 1:53 pm

Amklyde: Cryo after the races are installed? Is this to equalize stress? How long should the parts sit in the liquid nitrogen? two min, couple of days? Just looking to get head around this.
Steve H
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amklyde

Posts: 617

Joined: Fri Dec 19, 2003 1:01 am

Location: Wisconsin, USA

Post Wed Mar 14, 2007 6:33 am

I was going to post a link to my favorite cryo site but I don't see it on my list anymore. If you do a google search you will find a wealth of info. The racers around here swear the treatment doubles the life of engine and brake components.
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MarkBranst

Posts: 341

Joined: Thu Jun 24, 2004 12:01 am

Location: Champaign-Urbana, IL

Post Wed Mar 14, 2007 7:53 am

Pretty good cryo explanation sheet:

http://tinyurl.com/2otdc8

Mark

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