I call bullshit on all these guys spinning 8000 plus on cast cranks. A forged crank will fracture before it fails and a cast crank will just fail.
I’ve heard all the stories even at the local circle tracks and drag strips. Had a guy swear he was hitting 8k half way down the main straight at a bull ring 1/4 dirt track. So I looked at his gearing and tire size and at best, even running in 3rd gear he might hit 7200, and his corner exit RPM would have had to be over 6k to get that.
So I asked the clown what his corner exit RPM was and he didn’t have a clue. I say if you don’t know that, how do you know the RPM anywhere else? So a buddy of mine mounted an old video camera in the car so we could see that tach.
It hit 6600 before he lifted for the corner. A far cry from 8k. When he looked at the video he says WOW, it sure FELT alike 8k.
It’s silly to look at full grown men defend being cheap as dirt building power. It makes no sense.
Most main cap fretting isn’t from detonation and never has been. That’s a myth. It comes from the damper not effectively controlling crankshaft harmonics.
I’ve taken apart enough broken stuff and nearly broken stuff to know just because the crank isn’t in pieces doesn’t mean the damper works.
Most guys are far more lucky than good.
