Any experience with either of these?

The description of each doesn't really tell me much. When would you use the standard bearings and when would you want the performance bearings?

 

I've used the standard ones in the builds I do.

 

performance ones are narrower and chamfered iirc.

 

Get the coated ones.

Tim

 

The performance ones are coated by Calico and should have a T @ the end of the part #.

 

What's the big advantage for the coated ones?

The "performance" Dura-Bond bearings are available coated and uncoated.

Truth is, this is a budget build. Are the standard ones good enough?

 

OK. I forgot that they offered those. What do your cam bearings look like? IIRC the CHP part # has a better bearing material (micro babbitt) for increased loads. The CHP-23 is pretty cheap. I have a NIB set of CHP 10s I'd like to get sell but they're not interchangeable.

 

Is there any downside to the performance bearing?

 

The perf ones are used aftermarket cranks, which are usually machined to accomodate the bearing chamfer. Stock cranks, you use regular bearings. In the case of cam bearings, i don't see why it'd matter. I have basic durabonds in my car and it's seen 8k rpms.

 

There isn't a downside to the performance bearings that I know of. They are not chamfered because the camshafts bearing journals don't change when you use an aftermarket cam. This is pretty easy as far as upgrades go.

 

Back from the dead. Any difference in these?

 

Looking at the Dura Bond website, I found this:

Fluoropolymer Composite Coated Bearings

This dry lubricant actually penetrates the surface where it has been applied. The primary advantage is that bearings with FLUOROPOLYMER Composite Coating retain engine oil on the surface, even under extreme heat and pressure conditions.

Being a lubricant itself, the coating provides secondary (back-up) lubrication in the event that momentary oil starvation occurs. This characteristic is especially important during start-up because oil does not reach all critical components immediately.

They list CH-23 and CH-23T (coated) both as "high performance." I used the CH-23 in my build but would have used the coated bearings if they's been available back then.

 

I actually talked to Dura-Bond about this just the other day. It would appear that the difference between CH and CHP bearings is the thickness of the backing material. CHP bearings have a thicker backing material in order to improve the strength of the bearing. Because of this, the CHP bearings have a thinner babbit layer. A thinner babbit layer means less good embeddability if there are contaminants in the oil. This would appear to be the main compromise when using the higher performance CHP bearings vs the CH bearings.