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tips, technology, tools and techniques related to vehicle driveline components

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jfjfjf2
Julian Fussell
Somerset
(17 posts)

Registered:
02/18/2012 01:00PM

Main British Car:
TVR Griffith '94 RV8 5ltr

Re: RV8 Custom crank
Posted by: jfjfjf2
Date: March 13, 2012 02:18PM

Crower can produce a custom billet RV8 crank but 12 to 14 week delivery.

Someone mentioned Laystall cranks, they are somehow amalgamated with Allen Crankshafts Ltd. So they can still be obtained.

Art - Any word from Scat? I'm beginning to wonder if there's enough meat on the Rover crank to make a light weight crank like they do. Not like chunky Chevy/Ford cranks.

Upward.

Julian


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6218 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: RV8 Custom crank
Posted by: BlownMGB-V8
Date: March 13, 2012 03:27PM

Really, I suppose you could do that, (3.7 bore/3.85 stroke) if you were going for a light weight 5.4L engine. A bit undersquare and the block isn't all that strong and has other issues as well. But, with the right rods and slipper skirt pistons it could be done I expect. The real question is, how much is 80 lbs worth to you? Because what it will buy you (300 iron block) is a block that can handle well over 700 hp, has no liner issues, has much stronger threads and needs no thread inserts, has a larger bore already, and will easily give you a 5.7L displacement with an almost perfectly square bore and stroke (3.80 x 3.85). Then there is the whole issue about pulling the piston so far out of the bottom of the bore. May not be a problem but may also increase wear.

The MGB won't notice the weight difference, are you really confident you will? Because it will cost you money, engine life, and displacement. All of which I have a really hard time with giving up. As for bragging rights, have you noticed the subtle shift towards iron block engines? It still isn't much but we're seeing more and more SBFs and V6s. I have to think a lot of the reason is reliability, and this is the same reason I've gone to the iron block SBB. Some of us saw that trend coming and the only thing I know of that can slow it down is a new aluminum engine. Won't be the LS, too big. The 1UZ might stand a chance though, if it will fit. Now there's an engine with potential. Otherwise we're looking at the modern 4 cylinders and how much traction is one of those swaps going to get in the face of the V8 traditions?

Jim


roverman
Art Gertz
Winchester, CA.
(3170 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: RV8 Custom crank, chunky crank ?
Posted by: roverman
Date: March 13, 2012 04:07PM

Julian, Rover crank got sent to Scat, 3/12/12. I also spoke with them yasterday. They would start with the "chunky" sbf forging, if it is to happen. I'm apprehensive about lightening a cast rover crank,"maybe" pendulum cut the counterweights for a maximum cast effort. IMHO, their just not suited for serious, continous racing ventures. Onward, roverman.


jfjfjf2
Julian Fussell
Somerset
(17 posts)

Registered:
02/18/2012 01:00PM

Main British Car:
TVR Griffith '94 RV8 5ltr

Re: RV8 Custom crank
Posted by: jfjfjf2
Date: March 14, 2012 04:17PM

Art - Was it a long nose crank you sent? Also could I have the name of your contact? I'm dealing with Alex Gonzales.

Julian



Edited 1 time(s). Last edit at 03/14/2012 05:01PM by jfjfjf2.


roverman
Art Gertz
Winchester, CA.
(3170 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: RV8 Custom crank
Posted by: roverman
Date: March 14, 2012 06:50PM

Long nose. Alex is the guy.


roverman
Art Gertz
Winchester, CA.
(3170 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: RV8 Custom crank, update
Posted by: roverman
Date: March 23, 2012 03:47PM

I just called Scat, to follow-up. They have the Rover 4.6L crank I sent. Tom is working on the project. Word is call back in 4-6 weeks. Cheers, roverman.


Greg55_99
Greg Williams

(100 posts)

Registered:
11/01/2007 07:12PM

Main British Car:


Re: RV8 Custom crank
Posted by: Greg55_99
Date: March 24, 2012 05:25PM

Rover_buick1.JPG

Well "Aussie John". You asked about a Buick 350 crank in a Rover block. You got it! This is what it looks like. Forget the date on the pic. I just took this an hour ago. The main size was cut to 2.5495" (P76 size) so I took out the bearings, greased up the mains and dropped it in. It rotates freely. Hits nothing. As to what rods you'd use.... I have no idea...

You did ask...

Greg
Rover_buick2.JPG
Rover_buick3.JPG
Rover_buick4.JPG



Edited 1 time(s). Last edit at 03/24/2012 07:05PM by Greg55_99.



Greg55_99
Greg Williams

(100 posts)

Registered:
11/01/2007 07:12PM

Main British Car:


Re: RV8 Custom crank
Posted by: Greg55_99
Date: March 24, 2012 07:09PM

Rover_buick5.JPG
Rover_buick6.JPG
Rover_buick7.JPG

I had to dig through my mucky garage to ferret this stuff out....

Greg
Chall_RR22.JPG


roverman
Art Gertz
Winchester, CA.
(3170 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: RV8 Custom crank, mondo stroke !
Posted by: roverman
Date: March 24, 2012 10:38PM

Thanks Greg, Can't help but wonder if rods may hit oil port in block, etc. It looks like your also into Mopars and a Hemi ? You know Greg, a Jensen Healey will swallow a Hemi - no problem, jus' sayin. Onward, roverman.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6218 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: RV8 Custom crank
Posted by: BlownMGB-V8
Date: March 24, 2012 10:44PM

Yeah, I'd have thought a 350 crank in a Rover block would have been done long ago.

Jim


rrrover 5L
John Caine
Australia
(28 posts)

Registered:
08/16/2010 08:44AM

Main British Car:


authors avatar
Re: RV8 Custom crank
Posted by: rrrover 5L
Date: March 25, 2012 08:17AM

Now that's an encouraging sight, Greg!! Do you have a P76 or Rover rod & piston handy? It one could be attached to the crank, cam slipped in and the whole assembly rotated for the clearance check.

There would be alternative ways of getting oil to the pump if the internal gallery is the primary issue.

Jim B is correct in his view that a 300 block would be a better option in most cases.

In my part of the world, registration authorities & insurance companies make life difficult when alloy engine blocks get swapped for cast iron...Dont ask me why.....

I'm still trying to get my Bryant crank photos to load, as well.....

Cheers

John


Greg55_99
Greg Williams

(100 posts)

Registered:
11/01/2007 07:12PM

Main British Car:


Re: RV8 Custom crank
Posted by: Greg55_99
Date: March 25, 2012 12:16PM

These are old pics. This is the same crank in a P76 block but with a stock 73-80 Buick 350 rod and some piston I dug up that fits the bore. With this long rod, the capscrew just kisses the oil galley. On a P76 block, no problem to grind a bit of relief for clearance. No problems with the cam as well. Rod angle is the same as the 350 so no worries. The Rover block would get real interesting in there. But... I would say if hot rodders have already figured out how to use the stock 300 rod on this crank, would it be that tough to have a custom piston fabbed up to use? Also, the 75-77 Buick 3.8 odd fire rod is the same length as the Buick 300 rod but is shaped like the later 350 rod.

Some years ago I had a phone conversation with John Harcourt about the 350 crank in a P76 block. He told me a friend of his had actually done this swap but kept the 3.5" bore and used mildly ported P76 heads. He was disappointed with the result. I'm quoting "She wouldn't rev...". Things might be different now....

Greg


350_crank_6.jpg
350_crank_5.jpg
Rods1.jpg

left to right: Buick 215, Rover 3.5\3.9, SB Chevy 327, Buick 3.8 V6 (odd fire), Buick 300, P76, Buick 350(73-80), Buick 340\350(66-72)



Edited 4 time(s). Last edit at 03/25/2012 01:07PM by Greg55_99.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6218 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: RV8 Custom crank
Posted by: BlownMGB-V8
Date: March 25, 2012 01:19PM

Well, with a 3.85 stroke and 3.5 bore would you expect it to rev?
Just curious, if you were to either powder coat or jet hot coat the 300 block do you think they'd notice it was iron?

Jim


roverman
Art Gertz
Winchester, CA.
(3170 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: RV8 Custom crank, 5k , 7k rpm or ?
Posted by: roverman
Date: March 25, 2012 10:38PM

Perhaps I'm too old school ? I think a lightweight sports car should rev. Not having experienced the bliss of Bad Ass Torky Accelleration,(BATA) for short, perhaps I'm too quick to judge. Not knowing any better, It "seems" like having 30-40% more rpms available, might be fun ? Long Live RPM, roverman.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6218 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: RV8 Custom crank
Posted by: BlownMGB-V8
Date: March 26, 2012 12:06AM

A bigger bore could fix that.



rrrover 5L
John Caine
Australia
(28 posts)

Registered:
08/16/2010 08:44AM

Main British Car:


authors avatar
Re: RV8 Custom crank
Posted by: rrrover 5L
Date: March 26, 2012 06:26AM

Powder coat, hmmmm. Thanks for that thought, Jim:-)

What a picture library you have Greg! The generous store & sharing of knowledge on this site is phenomenal.

Some flanged 3.7 bore diesel "C" sleeves would fit nicely into that P76 block......


Greg55_99
Greg Williams

(100 posts)

Registered:
11/01/2007 07:12PM

Main British Car:


Re: RV8 Custom crank
Posted by: Greg55_99
Date: March 26, 2012 11:12AM

Well... like they say.... "Go BIG.... or go HOME..."

Greg



Edited 1 time(s). Last edit at 03/26/2012 11:16AM by Greg55_99.


rrrover 5L
John Caine
Australia
(28 posts)

Registered:
08/16/2010 08:44AM

Main British Car:


authors avatar
Re: RV8 Custom crank
Posted by: rrrover 5L
Date: March 30, 2012 07:10PM

OK, finally got a cable to upload Bryant SBF pics...Here they are
07032012037.jpg
07032012038.jpg
07032012039.jpg
07032012034.jpg

I will get an opinion & cost from a crank grinder of the mods required....One BE journal is fried so the idea is to go Honda which should give me 3.550 stroke, too.


Cheers

John


roverman
Art Gertz
Winchester, CA.
(3170 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: RV8 Custom crank
Posted by: roverman
Date: March 30, 2012 10:33PM

John, Somewhat important, does sbf use #3 main for thrust ? Main sizes ? Thanks, Art.


rrrover 5L
John Caine
Australia
(28 posts)

Registered:
08/16/2010 08:44AM

Main British Car:


authors avatar
Re: RV8 Custom crank
Posted by: rrrover 5L
Date: April 11, 2012 08:40AM

Art, yes, the SBF uses 3 for thrust, same as Rover. I'll measure mains & post shortly.

Cheers

John
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