jfjfjf2 Julian Fussell Somerset (17 posts) Registered: 02/18/2012 01:00PM Main British Car: TVR Griffith '94 RV8 5ltr |
Re: RV8 Custom crank
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 (6470 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: RV8 Custom crank
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. (3188 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 ?
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.
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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
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. (3188 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
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.
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roverman Art Gertz Winchester, CA. (3188 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 !
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.
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BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6470 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: RV8 Custom crank
Yeah, I'd have thought a 350 crank in a Rover block would have been done long ago.
Jim |
Re: RV8 Custom crank
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 |
BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6470 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: RV8 Custom crank
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. (3188 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 ?
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.
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BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6470 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: RV8 Custom crank
A bigger bore could fix that.
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Re: RV8 Custom crank
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...... |
Re: RV8 Custom crank
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roverman Art Gertz Winchester, CA. (3188 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
John, Somewhat important, does sbf use #3 main for thrust ? Main sizes ? Thanks, Art.
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Re: RV8 Custom crank
Art, yes, the SBF uses 3 for thrust, same as Rover. I'll measure mains & post shortly.
Cheers John |