[Fot] Racing rod design

[Aaron]

Love the add

"Buy wiht confidence"

Sent from my iPhone

> On Jul 22, 2015, at 17:05, 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:
>> 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/hpspitfire@gmail.com
> 
> 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/fot/attachments/20150722/8b455c09/attachment-0001.htm>