[Fot] Racing rod design

[Brad Eells]

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*
*Friends of Triumph*

*http://www.fot-racing.com/ <http://www.fot-racing.com/>*
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