[Fot] Racing rod design

[Bill Tobin]

Chris, maybe try Pauter, or if your pockets are deeper, Carrillo. Both make quality parts.
Good luck.
Bill
  ----- Original Message ----- 
  From: MadMarx 
  To: 'FOT' 
  Sent: Tuesday, July 21, 2015 1:24 PM
  Subject: [Fot] Racing rod design


  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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