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RB Main Bearings and Caps?
https://slantsix.org/forum/viewtopic.php?t=67265		 Page 2 of 2
Author:  Greg Ondayko [ Fri May 26, 2023 12:59 pm ]
Post subject:  Re: RB Main Bearings and Caps?
Their bearing catalog from my research seems a bit confusing.

Maybe I need to look again... or find a print version of the catalog
Greg
Author:  slantzilla [ Fri May 26, 2023 1:03 pm ]
Post subject:  Re: RB Main Bearings and Caps?
I had a set of King mains for a forged crank. Unfortunately they are in Iowa now.

I had the machine shop get them last year. It took 6 weeks for them to show up.
Author:  Rick Covalt [ Fri May 26, 2023 1:17 pm ]
Post subject:  Re: RB Main Bearings and Caps?
They were on E bay not to long ago. Summit racing also had them.
Author:  Charrlie_S [ Fri May 26, 2023 6:00 pm ]
Post subject:  Re: RB Main Bearings and Caps?
King Main bearings forged crank MB 407 AM
King Rod bearings forged crank CR 614 AM
That is from bearings I have on the shelf std size
Author:  DadTruck [ Fri May 26, 2023 8:08 pm ]
Post subject:  Re: RB Main Bearings and Caps?
Some conventional ( and conservative) wisdom from one HD diesel engine manufacturer’s Engineering Group is:
Steel crank, use a tri-metal bearing. Steel cranks and tri-metal bearing have been around together since babbit bearings were phased out. Lots of history there. Clevite is a tri-metal bearing.
Cast crank, use a bi-metal bearing. Cast cranks and bi-metal bearings were developed during the same time frames. King Bearing produces bi-metal bearings.

This does not mean that tri-metal bearing won’t function on a cast crank or that bi-metal bearings won’t function on a steel crank. Clearances and cleanliness are more important. The thought in matching steel and tri-metal and cast and bi-metal is, if it’s working and has worked for a long time, leave it alone.
Author:  Dave M [ Tue May 30, 2023 8:56 am ]
Post subject:  Re: RB Main Bearings and Caps?
I used 440 Source steel main caps in several of my engines. Little work to the thrust cap and a line bore.
Line bore wasn't cheap. Had to remove a bunch of material which was steel.

Dave
Author:  Dart270 [ Tue May 30, 2023 10:54 am ]
Post subject:  Re: RB Main Bearings and Caps?
Thanks, Dave! Maybe I will do this on my upcoming turbo/stroker shortblock build...

Anyone try to do the side-bolted main caps for the Slant? Just curious.

Lou
Author:  farmtruck [ Tue May 30, 2023 2:34 pm ]
Post subject:  Re: RB Main Bearings and Caps?
Quote:
King Main bearings forged crank MB 407 AM
King Rod bearings forged crank CR 614 AM
That is from bearings I have on the shelf std size
Thank you! That's what I was trying to find.
Author:  Charrlie_S [ Tue May 30, 2023 3:30 pm ]
Post subject:  Re: RB Main Bearings and Caps?
Quote:
Quote:
King Main bearings forged crank MB 407 AM
King Rod bearings forged crank CR 614 AM
That is from bearings I have on the shelf std size
Thank you! That's what I was trying to find.
Your welcome. You should have seen the look on the face of the King rep when I asked for Slant six forged crank engine bearing set, when I won the door prize at a King seminar at the PRI show. :wink: :wink:
Author:  Greg Ondayko [ Tue May 30, 2023 6:57 pm ]
Post subject:  Re: RB Main Bearings and Caps?
How would a side bolted cap work on a slant? It seems that the pan rails would nor be low enough for that.. maybe a 4 bolt splayed cap?

Greg
Author:  Dart270 [ Wed May 31, 2023 3:34 am ]
Post subject:  Re: RB Main Bearings and Caps?
Yeah, probably would need quite a bit of customization work, but who knows. Doubt there's enough meat in the side webs to do another splayed bolt. Just thinkin...
Author:  hyper_pak [ Wed May 31, 2023 6:13 am ]
Post subject:  Re: RB Main Bearings and Caps?
Girdle.
Author:  slantzilla [ Wed May 31, 2023 6:52 am ]
Post subject:  Re: RB Main Bearings and Caps?
Honest question, how many times have you seen someone beat the mains out of a Slant anyway? The block/crank seem pretty tough to start with.
Author:  CNC-Dude [ Wed May 31, 2023 8:49 am ]
Post subject:  Re: RB Main Bearings and Caps?
Main straps would be a good upgrade and just as effective while being more economical, but these blocks and cranks are so robust compared to other inline engines like the Ford or Chevy counterparts, I doubt you would gain any benefits as long as the production cylinder head is the limiting factor...
Author:  Dart270 [ Sun Jun 04, 2023 5:00 am ]
Post subject:  Re: RB Main Bearings and Caps?
I am aware of a few broken blocks at high HP levels (boost/N2O) and/or RPMs. Plenty of high HP Slants have lived without these, of course. I have never worried about this, but am starting a build where I want a reliable 450-500 HP on boost with a stroker crank and thought this would add insurance. Just thinkin...

Lou
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