ss performance

iTrader: (17)

I'm ready to order my rotating assembly and don't know which main & rod bearings to order.

I was going to order the Clevite H-Series bearings MS2199H and CB663HN but I don't know if I should spring for the coated or not.

This is going in my street/strip car, not a DD, 408 LQ4 block NA, 11.3 compression.

Any info or advise would be appreciated.

Thanks
Craig

Justus67

iTrader: (3)

Did you find anything out yet?

mannyman84

iTrader: (2)

Get the tri metal bearings non coated. I believe the coated ones they sell are bi metal.

mannyman84

iTrader: (2)

Plus I think the ms2199h are uncoated.

CBM Motorsports

iTrader: (2)

Some stroker cranks require the "H" bearings on the rods because they are not as wide as the "P" series. So I would say make sure your crank is stock bearing friendly first!

ss performance

iTrader: (17)

I spoke with Clevite, they said that the coated bearings are not needed in my application.

So let the ordering begin!

ckpitt55

iTrader: (4)

the coating wears off after startup / breakin anyway.

go uncoated and don't look back.

GordMurray

iTrader: (1)

I used them in my build. How thick is the coating, and after it wears off, will this open up bearing clearances?

Gord.

KCS

iTrader: (20)

I use Polymer Dynamics (PolyDyn) in Houston for coatings. They coated a set of ACL bearings for an LS7 I built, and after about a year of street racing and Texas Mile events making over 800whp on nitrous, the engine was torn down and the coating was still on the bearings.

I like coated bearings because you can use a bearing and have a good safe clearance, but the coating will reduce the actual clearance so that the oil pressure doesn't take such a hit. For example, my engine uses coated ACL bearings for .002-.0025" clearance. Without the clearance, I have as much as .0032" as a margin of safety.

If a situation happens where the journal needs more clearance, the coating is worn away instead of the bearing. The coating doesn't hurt anything if it's worn off and circulating in the oil, but bearing material passing through the engine does.

JakeFusion

iTrader: (7)

I agree with KCS. It's good for extreme builds. It helps on startup when the oil film is very thin and can take more punishment and extend the life of a motor.

redtan

iTrader: (5)

So if it extends the life of the motor, then wouldn't they be good in a non-extreme situation also? I mean what setup doesn't stand to gain from a longer lasting engine?

KCS

iTrader: (20)

I think you're right. The bearings in the newer LS engines seems to have a reddish colored coating on them.

JakeFusion

iTrader: (7)

Yes. I would say they are not overkill. On a street engine with a lot of cold startups, they probably are more beneficial.