Bearings

[old mate]

lads,

building a bottom end on a 25 and the talk on the town is that acl race bearings are too strong and after a while damage the crank. your thoughts and suggestions?

[proengines]

It's just talk, I use them in anything I do that I can buy them for. There is no way a bearing can be "too strong", they could be too hard or too soft but the ACL's are neither. ACL makes Nismo's bearings for them, exactly the same material and everything else as the race series.

[bnr#@]

A small time Australian bearing manufacturer makes the bearings that were specially engineered for NISMO's 24 hr endurance race program? I think not my friend. ACL don't even offer bearings to such fine tolerances as Nismo. Nismo has always made their own products and I hope always will. I have a fair bit of their stuff ad it is off the highest quality.

[r33_racer]

Weird where people get these ideas that japanese products are just so good...in comparison to other companies in this world, they are quite average. Alot of times, japense parts for japanese cars are not the best choice. I dont think ACL are actually that small too.

But i had heard that acl also make the nismo bearings....not so hard to believe, holinger were commissioned by nissan to make the racing dogbox for the 32gtrs back in the day.....they probably make some of the best gearboxs for race use in the world, same principle goes for motec/autronic. Hard to believe i know, that Australian companies are actually the best at somethings in this world when it comes to cars and motorsport! Being better then the japs isnt that hard, its the euro companies and stuff that are hard to beat....sometimes the americans too.

Way off topic....but acl bearings, especially race series are used by most top end racers, doesnt matter whether its drag racers, circuit racers, drift racers or sprint cars even road cars. They are spot on. Too hard a bearing is not possible, any bearing that isnt alloy will probably damage the crank if it touches it severely at almost any rpm/load. But as everyone knows if the bearings are touching the crank, then you have another problem which is more then likely bigger then a bearing selection problem. Normal running operation will not damaged the crank.

[The Dan]

Yeah I heard the same here. ACL Bearings are the Nismo items. MAHLE just bought ACL too so we should see some more improvements to their already awesome product.

Michael is also right in that the bearing should never touch the crank pin. The oil is what separates the two and if it doesn't, then you have different things to worry about.

ACL bearings are made to the finest tolerances but it doesn't mean they cannot be incorrect. I send back rings and bearings all the time. Make sure you measure everything first and don't just take for granted it will fit to the spec you have purchased them for.

[Guilt-Toy]

i would think proengines knows what he is talking about when it comes to engine components.

[old mate]

well the crank is touching it when the motor is off but thats on everything so there is no avoiding it i guess. too hard i swhat i meant sorry. well its some chat i have heard so i thought i would ask you lot. so far they are no problem providing they are set up correct etc.

Cheers guys.