[Fot] Racing rod design

[John Styduhar]

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:
>
>> 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
>>
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>>
>
>
> --
> *Brad Eells*
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>
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