TR6 What engine bearings to use in my rebuild?

I was all set to order King tri-metal bearings and reading Richard Goods web site he said they are best for racing and not for street use. Tried emailing and calling but no replies. As far as I can see I'm going to need the standard sizing. I'll know more this weekend when I get it apart. The 6 is a 69 and is only going to be a daily driver. I'm sure like most of us I'll get into it from time to time.

Looking to do a mild upgrade in performance. maybe 125 HP. No radical cams or super high compression. Might just use the stock cam and go up a rocker ratio to 155:1 with 9:1 compression.

I'd email Hap at Acme Speed Shop and maybe Macys Garage to see what they use in their street engines. For a TR6 motor, most people end up doing a very mild street build that brings it up to Euro PI spec/power. Only entails a very street-able cam and I think bringing the combustion chamber to ~9:1 to 9.5:1 . The straight 6 should last indefinitely on stock crank, rods, and valve train at that spec.

I've heard a bit of discussion of needing to install cam bearings if the rocker ratio is changed to 1.65:1, but the 1.55:1 is supposed to work fine in a daily driver engine without the hassle of that much machining. I wish there was a good roller kit in stock rocker ratio. That's just a good place to free up friction and ad some hardened components.

Keep us informed with your engine build. I'm hoping to have a project soon.....

The factory used tri-metal.

I have no idea why Richard would have said that. I see nothing wrong with tri-metal bearings and they only cost a little more than bi-metal.

JerryVV said:

The factory used tri-metal.

Click to expand...

I used the trick-metal when I did the rebuild on my 6.

There was a good interview done lately of tri metal vs bi metal bearings...it may make you rethink your choice...

Let me see if I can find it.

Cheers
Tush

Ok.

I’ll let you watch and make your own determinations.

https://youtu.be/Zr-gGOa2Jnk

Cheers
Tush

Are you completely dismantling the bottom end of engine, if so, carefully check the crank journal sizes before you order bearings.

Yep it's coming apart and that's what I meant when i said I'll know this weekend when i get it apart.
As luck would have it Richard called me today. The issue isn't the tri-metal bearing it's the gap between the crank and the bearings. He seems to think that there is an extra thousands on an inch gap. That would increase the oil flow about twice as much. So i need to closely measure the crank to see if they are within factory tolerances and hopefully on the upper side. I have tri-meta Vandervell bearings in my TR250. Don't remember tolerances when I did that motor together 15+ years ago but I also used a high volume oil pump. So anyway I was thinking of another brand of bearings not the composition.

That was interesting. Especially the two different accents of the speakers. American southern vs English. Anyway I'm not building a performance engine. Just want a bit more hp then factory and keep the reliability factor up. I'll go to their web site and check it out. Thanks Tush!