Quote Originally Posted by fulcrumaero View Post
LS
Richard's Machine shop in Euless

What's wrong....still trying to figure that out. At MSR-H, on lap one, my oil pressure suddenly dropped to zero, and the motor locked up before I could pull off. The engine had a light-rebuild, and only had about 5 hours of dyno time on it.
After I took apart the engine, rod bearing #4 had spun, and 1-6 were heavily scored. The oil-pump (previously new) had zero signs of wear, and had no contaminates in it. The oil pan was full of bearing shavings, and the pump pickup screen had shavings on it, but none made it into the pump. I didn't find shavings anywhere on the top end. I keep forgetting to cut apart my oil filter to examine it.
So, I'm not sure if low oil pressure lead to the rod bearing failure, or if the bearings killed the oil pressure. If not the bearings fault, I'm not sure what to blame.

My crank was warped, and is being replaced with a used unit. The block is currently being line-bored (I hope).
Did you use ARP Rod bolts? Their instructions say you need to resize the rod ends after torquing them to spec. I have read of similar failures to yours when skipping this step and I have read about guys having no problems when skipping this step. Not saying this is what happened just throwing it out there, also this doesn't explain the lack of shavings anywhere other than the pan?
We have been using katech rod bolts specifically because they don't require this step.
Good luck with your motor, I hope you make it to Cresson