Engine bearings
 

Who runs what?

How many run ACL or something similar.

How many are OEM?

Think 300whp 1.6L. What's my best option. Thrust bearings as well... as I know ACL offers them for the miata too.

I run OEM.
Most high power builds run ACL

Run OEM in mine but didn't get around to running it yet so no help

My builder recommended Clevite. He's had great success with them in hi HP race engines and that's what he stuck in mine. I can't speak to it personally as I haven't even gotten through engine break in yet.

I run oem with ~18psi. No problems so far, but only about 2k on the engine.

So I called the guy doing my engine boring and he suggested ACL. But for some reason I want to say that I read a few negative things about them in the past?

IMO usually you can't beat OEM. But in this case it was never designed to have 300whp. What about GTX OEM bearings, or are they the same?

I put King bearings in mine, because that's what FM sells/uses.

--Ian

ACLs in both of my motors.

300whp on a 1.6? definitely want to go with a performance bearing. I'd recommend ACL and have them line honed.

You guys using ACLs, are you all using their race bearings or their more standard Duraglide line? My understanding is that King bearings are more akin to the standard ACLs than the race bearings. What are the pros/cons of race bearings versus standard bearings in a dual purpose street/track motor?

ya, that what I was wondering as well. My car will be mainly a track car but I will also drive it on the street a lot. Like to work 2-3 times a week. So I need something that works both ways.

I'm going Rotrex, just so you can get an idea of what my build will consist of. Supertech's, M-tuned type rods, hayward performance head (local head guru) and MS1. + a C30-74 or C30-84 rotrex kit. I've talked to kraftwerks and a few others running them and really feel it's exactly what I've always been looking for in a high HP/dual purpose car. I hope to be the first person to run an uncorked rotrex on teh 1.6l :D.

I just sent my King bearings that were worn out in my FM built motor back to King for inspection. Kings response was that I should be using Tri metal bearings for this application. They are working on developing some new tri-metal bearings.

In the mean time I think the tri metal ACL race bearings is what should be used for 250+ hp motors over King. Much higher load capacity. And I think FM may be re-thinking what bearings they use. My first built motor from FM had Clevite I believe it also had some bearing issues when taken apart.

Bob

Gonna be putting high 200's at my next block with King bearings from FM...hope they last

I was about 360 Im still wondering if oil starve under braking could have contributed. In any case the Kings wont handle as much load as ACL Race.

Also Murphy like to single me out. Anything that can go wrong seems to go wrong for me.

Bob

To clarify, I'm running ACL Races in my motor.

Clevite here, but my engine is weak sauce high compression with no boost.

I am using ACL Bearings in even my high compression motor as it will only be seeing the track and be pretty beat on. It depends on your use for the car though. If you are building a weekend car that makes 250hp and you don't drive the hell out of it, then you really don't have a NEED for race bearings. They are good for extra insurance, but not a necessity. If you plan on driving a high power car at the track at all, I would suggest race bearings in the build.

It's going to be a strict track car.

I assume the race bearings have a shorter life than "street" bearings? So it would be a step backwards to put them in a DD car?

Then use race bearings