Acl Race Bearings And 1thou Oversize

[Duncan]

The ACL race bearings look good, proper tri metal bearings and available for rb25 and rb26. And of course Aussie made and readily available. And at about $200 a set the are cheaper than nissan's standard ones.

But, the question is, they come in an option for each size (standard, 10thou over, 20thou over etc)

Basically they allow either standard clearance or 1thou oversized clearance.

They claim this makes better lubrication due to the extra oil.

So, apart from increased wear (not an issue for this purpose), what are the disadvantages of using a 1thou oversize clearance on a bearing?

[33GTT]

The race series bearings do look inpressive,, I assume you mean a 1 thou extra clearance when you say 1 thou oversize, (in relation to 10, 20, 30 thou Undersize),, normally larger clearances are used in extreme high performance applications,, race engines for example run much larger clearances on all friction surfaces to allow for more expansion and lubrication under extreme temperatures / conditions etc,,

the race series bearings have different oil grooves when looked at compared to standard bearings, they sort of taper off to allow greater dispersal of the oil,, I fitted a Larry Perkins Race series kit to a 308 for a mates boat a while back,, overall the whole kit was impressive with nice light weight pistons,, even came with welsch plugs too,, better gaskets,, and was only around the $600 trade,, very nice package,,

would be interesting to see if they did a kit for the RB????

EDIT,,

lol, forgot to add the disadvantages,,

larger clearances are not good for normal everyday stop/start driving and without high vollumes of oil, any large clearances will only lead to exsessive wear,, clearances like that are normally only meant for constant high temp, high revs like racing,,

cheers

John

Edited March 5, 2006 by 33GTT

[Duncan]

you know I was hoping someone would say that

And yes I meant 1thou extra clearance some maybe I meant 1thou undersized not oversized :Oops: