If your guys really want to know why not just email or ring people like John sydney{race engine builder for supercars} or Cosworth even Hendrick motorsport, much easyer and you find out why they use certain Rods.
V8 supercar have been using Oliver{very very expensive} I-beams for a few years now because they have a low rev limit and they can handle 1000km's before being thrown in the bin. They use the I-beams to lower rotating mass as thats all they can do with there rev limit, they make everything lighter{rotating mass} to help spinup to point that matches the strength needed with some saftey margin to get the 1000kms or so till the $30k+ freshen up.
Dosnt matter which is better its more a cost thing to most people, i cant see many people on here{myself included on my own engines} spending $4000+ on a set of top quality I-beam rods!
Email some of the big engine builders, im sure one of them will tell you there reasons.
One for Stew, i have somewere and ill find it of were there developing the rods using the fracture line of the steel for the big End join, to get more strength.
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