Main and rod bearing question

[ezspooling]

Hey guys,

I have another question . As you have probably gathered by now I'm building my motor. I plan to go .20 over pistons. I want to run ACL main bearings and Rod bearings, and I was about to order them when a few different options came up. I believe they are as follows:

Standard
Standard w/ an additional .001 clearance
.010" / .25mm over

It had these options for both main and rod. I'm at a loss for what to order. Can someone clear this up for me?


-Taylor

 

[1990AWD]

Well I know the .010" over is the thicker bearings to make up for having a crankshaft recut, and I have to assume the standard with an extra .001" is for guys wanting that hair more clearance in there bearings (that "loose" kinda thing).

 

[TurboAnything]

Well I know the .010" over is the thicker bearings to make up for having a crankshaft recut, and I have to assume the standard with an extra .001" is for guys wanting that hair more clearance in there bearings (that "loose" kinda thing).

That is correct sir.

 

[ezspooling]

So if I plan on getting a new eagle crankshaft as well what bearing size would you recommend?

 

[TurboAnything]

I have always used the std size on all my builds. But so far every crank i have touched was on the small side so i did not need any more clearance.

 

[ezspooling]

I have always used the std size on all my builds. But so far every crank i have touched was on the small side so i did not need any more clearance.

I think I will just reuse my stock crank and go with standard size. Thanks for the info!

Well I know the .010" over is the thicker bearings to make up for having a crankshaft recut, and I have to assume the standard with an extra .001" is for guys wanting that hair more clearance in there bearings (that "loose" kinda thing).

Thanks! This is good to know!

 

[cmfd]

you might want to check your crank with a micrometer because ware on a crank can change clearances so you might have to get your crank cut and go with the .010 over to get proper clearances. Too much ware can cause premature failure of the bearings. see it with back yard mechanics not measuring for clearance.

 

[BOOSTIN21]

First things first, you HAVE to thoroughly inspect your crank for wear as already mentioned. There are small imperfections that can cause a crank to require a cut but you should at least get it polished if it checks out good. Magnafluxing it wont hurt either
I just got my rotating assembly back from the machine shop ready to be assembled. I spent hours checking clearances on the last motor i just built (2JZ) and plan on doing the same for my own.

Good luck with your build

 

[bryanwheat]

The most important thing to check on the crank is runout. A bent crank will destroy the main bearings real fast.

 

[JacksonAuto]

Magnaflux, check straight, polish and mic it first. Then once you know what you've got you can go ahead and order the bearings.