It has been proven on many V8 crankshafts. Like Ted has mentioned we are very fortunate that the 4G63 has substantial amount oil pressure in which a small engine block to do it with unlike a V8 which is why the OEM Mitsu crankshaft survives multiple 9000RPMS hits. The OEM Mitsu cranks are mass produced so it it much cheaper to cross-drill them as they were orignally designed to spin to 7500RPMS. If your looking for a crankshaft that is designed to properly oil the rod bearings no matter what the RPM is I would choose a K1 or Winberg. You get what you pay for.

If you happen to visit the PRI show this year I highly recommend stoping by the Winberg Booth and chat with either Randy or Dennis and they can explain a little more in depth.

 

I have a OE crank in my built 2.0 with ACL bearings and carillo rods.

it see's 9k on an almost daily basis, and the only thing that has broken is my trans.

 

I had a week before a thrust bearing failure.
My evo is built with cosworth parts and cosworth bearings.
max rev 9800rpm.
I am wondering what was the problem that cause the failure....

 

stock crank is good to what 1400 WHP ? and the thing has been tested to over 17,000 RPMS before it blows away... someone correct me if i am wrong

 

**** happens. Cosworth bearings might have been the failure. Ive seen it happen before, and thats why I wont touch them anymore. I stick with Clevite or ACL race

 

So when the same things happens with the acl you will say the same instead of finding the problem, Look at oil flow to the bearings rather than the bearings themselfs.

Mark

 

Ive seen Cosworth bearings fail more often than Clevite or ACL, a much higher failure percentage. Im not exactly sure why that is, but it happens, and Im not the only one to notice it. I asked a couple big shops if they heard of anything similar and they saw the same problems.

 

I have used Cosworth bearings in over 50% of my engines and all have been perfect but then I pay more attention to oil flow also.

Mark

 

Its funny because the cosworths and the ACL bearings are i believed made in the same factory. People pay for the name