Bearing Ratings

[EP91_Chris]

Does anyone know what ACL bearings are rated to, RPM wise?

Anyone have experience of running high RPM on a 4e or 5e?

Edit: Anyone run high RPM on Genuine Toyota Bearings?

 

[garry goodall]

the bearings should cope with what ever you can throw at them, providing they have a good supply of oil and pressure is good.

 

[Skalabala]

All bearings are the same bud. ACL normally handles harsh condition a bit worse due to larger clearances.
Any reputable brand will last as good as the next one.

If you want high RPM then you should question the rods and rod bolts

5E will be able to handle the most due to the much larger hydroplane area of the bearing

 

[EP91_Chris]

Thanks. Yes, will be running forged rods with ARP bolts.

I should maybe change the title of the thread to 'high RPM's'.

In terms of valve springs, I'll be running cruise, however a few on UKSO don't seem to think they will be up to the job of 9000rpm. Any suggestions on valve springs?

All being well a set of speedvision cams too.

Also, while I'm here; increasing the oil pressure. I know the 7m-gte suffered low oil pressure at the best of times and alot of people modify the oil pump to increase the pressure - can any modifications be made to increase the oil pressure on the 5e?

 

[dac69er]

Thanks. Yes, will be running forged rods with ARP bolts.

I should maybe change the title of the thread to 'high RPM's'.

In terms of valve springs, I'll be running cruise, however a few on UKSO don't seem to think they will be up to the job of 9000rpm. Any suggestions on valve springs?

All being well a set of speedvision cams too.

Also, while I'm here; increasing the oil pressure. I know the 7m-gte suffered low oil pressure at the best of times and alot of people modify the oil pump to increase the pressure - can any modifications be made to increase the oil pressure on the 5e?

you can shim the pressure relief valve to alter the pressure

 

[350ep70gr]

oem rod bearing are fine for high rpms.Acl also. Last 5-6 years to all my builds including mine i use acl for crank and oem bearings for rods. The key is the oil pressure and the rest of the rotating mass that can follow the requested rpm IN ONE piece INSIDE the engine.Also keep in mind that the stress to the engine is not linear.So 15% more rpms it is not 15% more stress.Cruise valve springs can follow no problem.Up there you have the 1/2 of the rpms.

Chris

 

[weeJohn]

How does the alternator, water pump and pas pump react to all these revs?

 

[dac69er]

How does the alternator, water pump and pas pump react to all these revs?

under-drive pulley is what you want to consider if going for higher rpm.