Slant Six Forum :: RB Main Bearings and Caps?

I believe all are the same except for the thrust bearing cap. The 440 one would need slight modification to work with the slant.

I believe Ceej Has done this cap swap on one of his builds!

Greg

I'm just getting started with a pretty exotic (and long-term) slant build - and the first order of business is getting the 170 crank I have into a good 225 block (which I think I have - it's getting checked at the machine shop currently).
.

Quote:

Please state why you are going to put a 170 crank into a 225 block.
PS: Big block aftermarket billet caps can be used on a forged crank slant block, with the proper machining.

Please state why you are going to put a 170 crank into a 225 block.

Quote:

Please state why you are going to put a 170 crank into a 225 block.

3 reasons: 1) So you can have a 170 that weighs 50# more than stock.

2) So you can run 8" long connecting rods.

3) So you can build and engine with 75 HP less than a 225.

All valid reasons!

Just teasing! We all in the Slant 6 crowd are a little crazy. We all march to the beat of a different drum, so enjoy your build and share with us what it is when your ready!

Thanks for sharing your build with us.
Can you tell me the reason for the aluminum main bearing caps?

I was just curious. While I don't agree with using that long a rod, some of us do weird things. I have a 170 block that has a 170 crank, 2.2 turbo pistons, and 170 rods, that had to have about .180 removed from the deck, to bring the pistons back to zero deck height (which is stock). Then with the dish in the piston, compression is less than factory. The only thing gained was a better ring package, and a lighter wallet.
PS: I didn't build this, but have all the parts. Just don't know what to do with the block.

King bearings are very good.

Author:	farmtruck [ Wed May 24, 2023 2:03 pm ]
Post subject:	RB Main Bearings and Caps?
I'm just getting started with a pretty exotic (and long-term) slant build - and the first order of business is getting the 170 crank I have into a good 225 block (which I think I have - it's getting checked at the machine shop currently). My question is on main bearing dimensions - I've seen a few places mention that 440 main caps can fit on a slant, but I've looked all over and can't seem to find the bearing dimensions. Can anyone confirm if 440 caps and/or bearings will fit a forged crank slant six? I know I'll need to line bore/hone to fit, but I was going to do that anyways, so that's fine. The reason I ask is because there are aluminum 440 aftermarket caps available, but nothing I've found for a slant, and for my specific application those would be desirable. Oh, and yes, I know I'm crazy doing this. But this is as much an experiment as it is a race build, so I'm fine doing some things that haven't ever been done before, and with only marginal potential benefits . . .

Author:	Greg Ondayko [ Wed May 24, 2023 2:14 pm ]
Post subject:	Re: RB Main Bearings and Caps?
I believe all are the same except for the thrust bearing cap. The 440 one would need slight modification to work with the slant. I believe Ceej Has done this cap swap on one of his builds! Greg

Author:	farmtruck [ Wed May 24, 2023 2:38 pm ]
Post subject:	Re: RB Main Bearings and Caps?
Quote: I believe all are the same except for the thrust bearing cap. The 440 one would need slight modification to work with the slant. I believe Ceej Has done this cap swap on one of his builds! Greg Thanks! I just sent him a PM (I think, it's showing in my outbox but not in sent).

Author:	Charrlie_S [ Wed May 24, 2023 4:11 pm ]
Post subject:	Re: RB Main Bearings and Caps?
Quote: I'm just getting started with a pretty exotic (and long-term) slant build - and the first order of business is getting the 170 crank I have into a good 225 block (which I think I have - it's getting checked at the machine shop currently). . Please state why you are going to put a 170 crank into a 225 block. PS: Big block aftermarket billet caps can be used on a forged crank slant block, with the proper machining.

Author:	farmtruck [ Wed May 24, 2023 4:50 pm ]
Post subject:	Re: RB Main Bearings and Caps?
Quote: Quote: I'm just getting started with a pretty exotic (and long-term) slant build - and the first order of business is getting the 170 crank I have into a good 225 block (which I think I have - it's getting checked at the machine shop currently). . Please state why you are going to put a 170 crank into a 225 block. PS: Big block aftermarket billet caps can be used on a forged crank slant block, with the proper machining. Good to know, that confirms what I was seeing. And because . . . reasons.

Slant Six Forum https://slantsix.org/forum/

RB Main Bearings and Caps? https://slantsix.org/forum/viewtopic.php?t=67265	Page 1 of 2

Author:	Rick Covalt [ Wed May 24, 2023 5:45 pm ]
Post subject:	Re: RB Main Bearings and Caps?
Quote: Please state why you are going to put a 170 crank into a 225 block. 3 reasons: 1) So you can have a 170 that weighs 50# more than stock. 2) So you can run 8" long connecting rods. 3) So you can build and engine with 75 HP less than a 225. All valid reasons! Just teasing! We all in the Slant 6 crowd are a little crazy. We all march to the beat of a different drum, so enjoy your build and share with us what it is when your ready!

Author:	hyper_pak [ Wed May 24, 2023 6:13 pm ]
Post subject:	Re: RB Main Bearings and Caps?
Thanks for sharing your build with us. Can you tell me the reason for the aluminum main bearing caps?

Author:	farmtruck [ Wed May 24, 2023 6:59 pm ]
Post subject:	Re: RB Main Bearings and Caps?
Quote: Quote: Please state why you are going to put a 170 crank into a 225 block. 3 reasons: 1) So you can have a 170 that weighs 50# more than stock. 2) So you can run 8" long connecting rods. 3) So you can build and engine with 75 HP less than a 225. All valid reasons! Just teasing! We all in the Slant 6 crowd are a little crazy. We all march to the beat of a different drum, so enjoy your build and share with us what it is when your ready! Mostly #2, but partially #3 - there may or may not be a displacement class involved, and I've always wanted to build a super high rod-ratio engine . . .

Author:	farmtruck [ Wed May 24, 2023 7:01 pm ]
Post subject:	Re: RB Main Bearings and Caps?
Quote: Thanks for sharing your build with us. Can you tell me the reason for the aluminum main bearing caps? Part of this experiment is to see just how high I can get the CR without going boom on pump gas, and aluminum caps would give the mains a better chance at surviving. Is it probably overkill? Yeah, definitely. Is it a big cost increase when I'm already going to have the machine shop line bore/hone it? Not really.

Author:	Charrlie_S [ Wed May 24, 2023 7:28 pm ]
Post subject:	Re: RB Main Bearings and Caps?
I was just curious. While I don't agree with using that long a rod, some of us do weird things. I have a 170 block that has a 170 crank, 2.2 turbo pistons, and 170 rods, that had to have about .180 removed from the deck, to bring the pistons back to zero deck height (which is stock). Then with the dish in the piston, compression is less than factory. The only thing gained was a better ring package, and a lighter wallet. PS: I didn't build this, but have all the parts. Just don't know what to do with the block.

Author:	farmtruck [ Wed May 24, 2023 9:26 pm ]
Post subject:	Re: RB Main Bearings and Caps?
Quote: I was just curious. While I don't agree with using that long a rod, some of us do weird things. I have a 170 block that has a 170 crank, 2.2 turbo pistons, and 170 rods, that had to have about .180 removed from the deck, to bring the pistons back to zero deck height (which is stock). Then with the dish in the piston, compression is less than factory. The only thing gained was a better ring package, and a lighter wallet. PS: I didn't build this, but have all the parts. Just don't know what to do with the block. That does sound like a lot of work for minimal gains. I'm going to go with a custom rod and probably some version of a 4G64 stroker piston, so take full advantage of the deck height. I know I could make oodles more power for a fraction of the money by just boosting a basically stock 225, but I like doing experiments and I have a displacement limit.

Author:	slantzilla [ Thu May 25, 2023 8:54 am ]
Post subject:	Re: RB Main Bearings and Caps?
Nitti has 440 caps in his Duster. IIRC, the thrust cap needs some machining for the bearing to fit properly.

Author:	farmtruck [ Thu May 25, 2023 4:41 pm ]
Post subject:	Re: RB Main Bearings and Caps?
So silly me thought I could just do a quick google search and find a set of new high performance crank/rod bearings . . . . but I'm finding that's not the case. Any recommendation on bearings? Realistically for the hp and RPM levels I'm looking at, stock replacement would probably be fine, but I'd rather step up to something a little higher performance if I can find it . . .

Author:	Rick Covalt [ Thu May 25, 2023 5:02 pm ]
Post subject:	Re: RB Main Bearings and Caps?
King bearings are very good.

Page 1 of 2	All times are UTC-08:00
Powered by phpBB® Forum Software © phpBB Limited https://www.phpbb.com/

Author:	farmtruck [ Fri May 26, 2023 11:21 am ]
Post subject:	Re: RB Main Bearings and Caps?
Quote: King bearings are very good. I've heard that too, but when I looked at their catalog I only found bearings listed for "1960-1976 cast crank" engines, which has me a bit perplexed. HAHA! Does anyone know a P/N that works for sure with a forged crank?