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Standard Bearings Vs Acl Racing Bearings?

Nosure

By Nosure,
in Engines & Forced Induction

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Nosure Proficient

Nosure

Posted
Posted

Hi guys I just have a low IQ question

what the standard bearings will do for over 600hp??? will it handle?? my engine has been rebuilded (i only know it got forged piston), but i'm not sure it got standard bearing or acl bearing. i don't want damage the engine by big power :P

what the standard bearing can handle??? any idea??

thanks!

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

I've never heard of anyone rebuilding and using the standard bearings :P

Even if its a mild one, and being RB's spin bearings rather easily with 300-350rwkw (stock motors)... probably not a good idea.

Nosure Proficient

Nosure

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I've never heard of anyone rebuilding and using the standard bearings :P

Even if its a mild one, and being RB's spin bearings rather easily with 300-350rwkw (stock motors)... probably not a good idea.

ok i only know it got JE pistons/rings, H-beam-precision, ARP 2000 head studs. so you reckon it got new bearings or acl bearings??

GTRNUR Grand Master

GTRNUR

Posted
Posted

Unless you can ask the builder whats in there, its anyones guess. Though if you can ask the builder, ask him what the clearances are that it was assembled with as well.

Im no expert on the subject but I'd have thought that standard bearings would handle a hell of a lot of power, and failures would occur primarly because of the rod journel going out of round due to either rod distortion or bolt stretch at high rpm. This then would interrupt the thin film that allows the bearing to float on the rod journel. Instantly creating a hot spot resulting in the bearing to grab and then spin.

I wouldnt be counting oil surge as a cause bearing failure, though some bearings will be more tolerant of this than others. Makes me wonder how many failures have actually occurred solely through too much power being extracted from the engine.

An engne assembled from stronger components will tolerate more tuning errors than one built from lesser components. Though the more power you extract the smaller the margin for error, and the more damaging the potential disaster is when it all goes wrong.

Nosure Proficient

Nosure

Posted
  • Author
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Unless you can ask the builder whats in there, its anyones guess. Though if you can ask the builder, ask him what the clearances are that it was assembled with as well.

Im no expert on the subject but I'd have thought that standard bearings would handle a hell of a lot of power, and failures would occur primarly because of the rod journel going out of round due to either rod distortion or bolt stretch at high rpm. This then would interrupt the thin film that allows the bearing to float on the rod journel. Instantly creating a hot spot resulting in the bearing to grab and then spin.

I wouldnt be counting oil surge as a cause bearing failure, though some bearings will be more tolerant of this than others. Makes me wonder how many failures have actually occurred solely through too much power being extracted from the engine.

An engne assembled from stronger components will tolerate more tuning errors than one built from lesser components. Though the more power you extract the smaller the margin for error, and the more damaging the potential disaster is when it all goes wrong.

OK so my understanding is the standard bearing should handle a lot power if the tune and assembled are correct?

GTRNUR Grand Master

GTRNUR

Posted
Posted

More important than bearing brand/type is the assembly clearances....so

If everything is top-top with the assembly, bearing cleance checked properly, rods and crank checked for roundness etc I doubt you would manage to crush a standard rod bearing with just 100hp per bearing. BUT how this would survive long term though is entirely another matter.

Nothing lasts for ever. Ive yet to read a thread where someone says their 600hp engine has just clicked over 100,000k's.

If you really want to be sure, it needs to be pulled apart and checked. This is the only option unless your builder can tell you exactly what the assembly specs of the engine are.

I just noticed that you didnt mention upgraded rods or rod bolts too. So there is your next weak link. Then there is the oil pump and oil pump drive (R32 or Jun/R33/R34 type).... which head gasket was chosen....the list goes on. There are lots of other weak links before i'd be woried about the bearings.

Nosure Proficient

Nosure

Posted
  • Author
Posted
More important than bearing brand/type is the assembly clearances....so

If everything is top-top with the assembly, bearing cleance checked properly, rods and crank checked for roundness etc I doubt you would manage to crush a standard rod bearing with just 100hp per bearing. BUT how this would survive long term though is entirely another matter.

Nothing lasts for ever. Ive yet to read a thread where someone says their 600hp engine has just clicked over 100,000k's.

If you really want to be sure, it needs to be pulled apart and checked. This is the only option unless your builder can tell you exactly what the assembly specs of the engine are.

I just noticed that you didnt mention upgraded rods or rod bolts too. So there is your next weak link. Then there is the oil pump and oil pump drive (R32 or Jun/R33/R34 type).... which head gasket was chosen....the list goes on. There are lots of other weak links before i'd be woried about the bearings.

thank you for suggestion. the engine running good so far. i just want know what the power limit the engine can taken.

so i think i should make the power between 400-500hp if im not sure what specs of the engine, thats safer.

now the car already make 460hp. maybe i should stay this power until the engine die:)

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