FS Weak spot - thrust bearing

[Kooldino]

Ok, so I started rebuilding my engine with an experienced mechanic/engineer. He was impressed with the engine in general...and then we got to the thrust bearing. It doesn't even cover 180* of the crank, while it SHOULD cover 360*. This will make our motors susceptible to crank walking (ie, making the crank shift side to side). That's a BAD thing. DSM's have that problem, and their thrust bearing is much better than ours.

It wouldn't take much to have it a 360* bearing...we could just have the bottom crank journal machined to accept a new bearing (which is just a thin peice of metal). But the cost of doing just one may be a bit high. With maching, you pay for the setup, not so much the process. SO if a machine shop were to do more at once, it would get cheaper and cheaper.

Being that there's a few guys rebuilding their motors soon...is anyone else down for this? Could save you some heartache...

discuss.

 

[Lurch]

Never been an issue.

 

[azian6er]

Never been an issue.

word. I havent ever heard of an fs with crankwalk. Then again a lot of us arent using such heavy pressure paltes as the dsm guys use. I dont know.

-B

 

[Kooldino]

Yeah, I haven't heard of it being an issue either, but like 6er said, we don't have crazy pressure plates, plus there hasn't been tons of proteges that make a lot of power yet.

 

[kcbhiw]

The B (B6ZE, BP, etc) series engines only use a 180-degree (realistically, probably only 170-degrees) thrust bearings. Each one is placed on the opposite sides of the #4 main support. I've never heard of any crankwalk/wobble issues associated with it in these engines. Not to mention, many people have produced serious amounts of power with those engines.

EDIT: I forgot to add that the only thrust bearing failures that I'm aware of in the BP were a few select 99 Miatas. They usually quit the game within the first 20k miles, thought.

 

[perfworks]

The B (B6ZE, BP, etc) series engines only use a 180-degree (realistically, probably only 170-degrees) thrust bearings. Each one is placed on the opposite sides of the #4 main support. I've never heard of any crankwalk/wobble issues associated with it in these engines. Not to mention, many people have produced serious amounts of power with those engines.

EDIT: I forgot to add that the only thrust bearing failures that I'm aware of in the BP were a few select 99 Miatas. They usually quit the game within the first 20k miles, thought.

WE dont have the same oil jet issues as do the stock 2nd gen mitsus. There is no need for it.

 

[kcbhiw]

WE dont have the same oil jet issues as do the stock 2nd gen mitsus. There is no need for it.

That's true too.

 

[MikeBlueP5]

ALOT of the bearing kits i have sold have a thrust bearing like that pictured above. Some were built into the crank bearing itself. you would be surprised at how many only cover 180* of the crank. another thing is it would be easy to machine the cap but what about a new bearing that covers 360*?

 

[perfworks]

ALOT of the bearing kits i have sold have a thrust bearing like that pictured above. Some were built into the crank bearing itself. you would be surprised at how many only cover 180* of the crank. another thing is it would be easy to machine the block but what about a new bearing that covers 360*?

Thge Mazda Block is already machined. You would need to to machine the caps.

 

[Lurch]

I mean its never been an issue. Even with 230 hp and using 7.25" Tilton single plate rally clutch with no springs or marcels...no problem.