[Fot] Racing rod design

[MadMarx]

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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