full channel main rod bearings

[DeftAnesthetik]

what brands of bearings are fully channeled? i need a new set but do not wish to spend double to get full oil channels so i am wondering if anyone knows what brand to buy that comes full channel.

for a 4age

[30psi 4agte]

Ahh do you mean main bearings not the rod bearings ?

I have never seen grooved rod bearings.

Ps dont know of any that can be bought in the one complete set.

Im am interrested in this as an option for better oiling though and would be keen to discuss the outcome of someone who is runing this sort of setup

[allencr]

I'm pretty sure you'll never find any grooved rod bearings, and the benefits of both mains compared to the reduced surface area on the more important/higher loaded lower main is near zero.

Rod lube problem??

[30psi 4agte]

I tend to agree with you there. Hence wanting to hear from someone who is running this setup.

I read about this mod on bill sherwoods site so it must have some merrit.

[DeftAnesthetik]

yes i meant mains, just so much going on in my head

interestingly enough i pulled apart the bottom end of my 3a and found that they are full channel. thats right from factory. its odd to see them like that in an older engine and then not so in my 4a s/t. i wonder if i ordered a set of 3a bearings if they would come full channel?

[30psi 4agte]

Any particular reason why you are so set on full channel ??

[terryo]

I have the correct fully grooved main bearings in stock. what size do you want?? . email me at work . [email protected]

[30psi 4agte]

TERRYO: what are the main advantages of this besides better oiling ?

Have you tried this with any high hp highly loaded engines ?? How do the bearings last with less surface area

[DeftAnesthetik]

Any particular reason why you are so set on full channel ??

i'm not set on it i am thinking of achieving the best oil flow possible. i suppose that there is a reason that toyota only put half channels in, i just hope that reason is not to save $$$. the car is only going to be a daily driver but i still plan on reving the shit out of it.

[30psi 4agte]

The only drama i can see with it is the load side of things. Reving the shit out of it is fine but when the engine is making large amounts of power 250 rwkw + and the crank is under considerable load ...... I just wonder if having more material (bearing) available to spread this load is a better option ?

[DeftAnesthetik]

The only drama i can see with it is the load side of things. Reving the shit out of it is fine but when the engine is making large amounts of power 250 rwkw + and the crank is under considerable load ...... I just wonder if having more material (bearing) available to spread this load is a better option ?

ill take you further on that thought, does having the oil encompassing the entire crank take any load? or help distribute the load? or do a better job even?

[TooF]

i have a feeling the ACL "race series" bearings are full grooved for the mains and half grooved for the big ends.

[30psi 4agte]

ill take you further on that thought, does having the oil encompassing the entire crank take any load? or help distribute the load? or do a better job even?

Tell you the truth i dont know. hence my interrest on the subect.

The oil surrounding the crank could provide a better load capability providing there is sufficent oil pressure to keep the crank afloat. ???

[DeftAnesthetik]

Tell you the truth i dont know. hence my interrest on the subect.

The oil surrounding the crank could provide a better load capability providing there is sufficent oil pressure to keep the crank afloat. ???

Thats what I am thinking too bad there is no (easy) way to test this theory. If you had sufficient pressure would the crank "suspend" itself in the oil thus lessening any friction. since the oil pump is driven off the crank the more you rev the higher the oil pressure?

this is going to eat at my skull all day.

[TooF]

in a word.. no.

yes as the pump/crank spins faster it moves more oil but there is a pressure relief valve in the system to maintain a steady and controlled oil pressure.

and the crank should *always* be suspended in an oil film. if this breaks down or is too thin then thats when you get metal-metal collision and breakages.

my understanding on the grooved bearings was to ensure a more even distribution of oil to the entire surface.