[Fot] Racing rod design

[toodamnfunky at comcast.net]

I've been using them for the last seven years with no problems. 
jim g 

----- Original Message -----

From: "John Styduhar" <johnstydo at gmail.com> 
To: "Brad Eells" <tr4abrad at gmail.com>, "Triumph 'Friends of Triumph" <fot at autox.team.net> 
Sent: Thursday, July 23, 2015 6:34:24 AM 
Subject: Re: [Fot] Racing rod design 

Yes, they are the ebay rods. I saw some e-mail traffic that they don't clear the cylinder liners at the bottom when rotated. 

On Wed, Jul 22, 2015 at 8:05 PM, Brad Eells < tr4abrad at gmail.com > wrote: 



Are these the Ebay rods that have been discussed? 

http://www.ebay.com/itm/Connecting-Rods-for-Triumph-TR3-TR4-Forged-Conrods-Con-Rod-158-75mm-ARP-Bolts-/131562025540?hash=item1ea1b53244&vxp=mtr 

Any thoughts? The price is certainly attractive... 


Brad 

On Tue, Jul 21, 2015 at 12:24 PM, MadMarx < tr4racing at googlemail.com > wrote: 

<blockquote>



Hi Guys, 

  

After my engine blow at the last race and a rod in two pieces I investigated about rod design. 

  

In US forums I found an interesting opinion: 

  

H-beam rods are for low rev high torque engine (turbo, compressor) 

I-beam are for medium torque engines with high revs 

  

As engineer I agree with this statement. On high revs the rod shaft gets bended back and forth by the inertia caused by the rotation. 

I could imagine that the sharp sides of the H-beam rod will create a crack after a while because the stiffness for bending along the rotation axis smaller than with an I-beam rod. 

That means to me that the fatigue resistance is smaller on an H-beam rod at high revs. 

With high revs on a long stroke engine I mean 6000+. 

  

The manufacturer of the broken H-beam rod was Scat. 

  

I think next time I order an I-beam rod from Scat. 

  

What do you think? 

  

Cheers 

Chris 

_______________________________________________ 
fot at autox.team.net 

http://www.fot-racing.com 

Donate: http://www.team.net/donate.html 
Archive: http://www.team.net/archive 
Forums: http://www.team.net/forums 
Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/tr4abrad@gmail.com 









-- 
Brad Eells 
Friends of Triumph 
http://www.fot-racing.com/ 




_______________________________________________ 
fot at autox.team.net 

http://www.fot-racing.com 

Donate: http://www.team.net/donate.html 
Archive: http://www.team.net/archive 
Forums: http://www.team.net/forums 
Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/johnstydo@gmail.com 




</blockquote>



_______________________________________________ 
fot at autox.team.net 

http://www.fot-racing.com 

Donate: http://www.team.net/donate.html 
Archive: http://www.team.net/archive 
Forums: http://www.team.net/forums 
Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/toodamnfunky@comcast.net 



-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/fot/attachments/20150723/78f6bd16/attachment-0001.htm>