Engine Failure

[Nissan power]

I brought a R33 GTR about two months ago. I noticed the A/C belt shredding so I got a leaver and pried the crank pulley back and foward and noticed alot of crank end float.

I had the motor stripped to notice crank thrust bearings have been half worn on one side only as well as a couple of spun main bearings.

Car made 450kw on 28 psi on e85 but the oil catch can used to fill up with oil and water every 1500kms

Motor was built about 10000 kms ago

Oil pump: Tomei

Sump: standard

Clutch: twin plate exedy

Oil return line from head to sump.

Need help what could have caused the problem and what mods to do this time to ensure this does not happen again.

Thanks guys

[GTR_JOEY]

also how often did the oil get changed and what oil did u use?

i have a freind that spun a bearing in his engine that was running on 85 simply becasue the oil wasnt changed enough and the oil was contaminated

[Nissan power]

Every 3000kms royal purple

[Moodles2]

Tomei + standard sump is insanity. The oil pump gears on the Tomei pump are massive, I wouldn't be suprised if the increased flow from the pump drained the sump completely. http://www.tomei-p.co.jp/inf/pdf/22_ae_Letter.pdf

[GTR_JOEY]

How often in terms of time?

I've argued this point before regarding after marker pumps and emptying a sump...

The reason why I reckon it's a load of rubbish in most cases is because generally there is a restrictor in the head that will match the flow of the pump.. Therefore the pump is going to hit it's pressure releif sooner due to more resriction and excess oil will drain back to the sump

[Nissan power]

But in that case you would have to know the pefect resrictor size and set you pump up to a perfect pressure to have enough oil in the head and the sump