[Fot] Racing rod design

[Duncan Charlton]

Those are the ones — and we’ve discussed them here before.  Some were skeptical but a couple of FoT’ers spoke up and said they’d used them and were happy with them.
Duncan
(Texas)

> On 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 <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 <mailto: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
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> 
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