ive got a RB30DET in my r32 gtst. Its got a stock vl bottom end, but with a r32 gtst oil pump. After doing high speeds and reving it out to 7000rpm, my car started to make knocking noises about 10 mins later after just cruising at 110km along highway. I noticed a little drop in oil pressure. The knocking noises got worse as i slowed down and stopped. When i started it up again, it was knocked really bad.
We took the motor out and pulled it apart, to notice that one of the big ends was down to the metal, and the two shells had been rolling. Another one was down to the copper. When bearings went in the, clearances where all good.
Just wanted to know if anyone knew why they failed. Could it be that the oil pump is not pumping enough oil the the bearing at high revs and speeds, or maybe some dirt got into it?