rb30det bearings turbo or non turbo??

[Wrath]

Hi guys

im building a Rb30Det and i have just got my bottem end parts back from the machine shop... im about to order some ACL race bearings and i was wondering is there any difference between the turbo and non-turbo main bearings...

which should i use.

[Fitzpatrick Speed Works]

theres no difference!! Use what fits your crank, if its been machined on the main journals you will need oversized units!!!

[Guilt-Toy]

hey dude

ive used stocko first size over sized ACL bearings and ive had no issues so far... 8000km later and 230rwkw from rb30det and no issues at all.

If you want more then 300rwkw i would suggest something more appropriate but 300rwkw is pretty hard anyway.

good luck

[dnb]

apparently nissan bearings are the go.my machinist said the rb30 crank gets very good oil delivery (being crossdrilled from the factory n all) so worrying about grooved bearings isnt worth it.

[proengines]

The ACL race series bearings are a nice thing, good material, hard back etc.. the only thing I would modify is to drill the extra feed holes through the oil groove in the upper bearing in the same way the original Nissan bearings are done. ACL will be doing this in the future on these bearings according to their rep I was speaking to a week or so ago.

The other bearings I have found good are King, especially for conrod bearings. They run a very hard backing and a single layer of alecular bearing material rather than separate layers with an overlay that can flake under high loads/heat.

Genuine Nissan conrod bearings don't seem to cope terribly well with any detonation. We recently had the sump off a 26 running around the 300rwkw mark and the Nissan conrod bearings had started to delaminate and had lost their tension. They wouldn't clip back into the rod, I've still got them here if you'd like a photo. We replaced them with King bearings. I haven't tried the Nismo bearings in the same situation but apparently they are a lot better than standard Nissan.