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

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WedgeWorks1
Mike Perkins
Ellicott City, Maryland
(460 posts)

Registered:
07/06/2008 08:07AM

Main British Car:
1980 Triumph TR8 3.5 Litre Rover V8

authors avatar
4.020-inch Bore
Posted by: WedgeWorks1
Date: December 11, 2009 09:30PM

MVC-074S.JPG
MVC-079S.JPG


castlesid
Kevin Jackson
Sidcup UK
(361 posts)

Registered:
11/18/2007 10:38AM

Main British Car:
1975 MGB GT Rover V8 4.35L

Re: 4.020-inch Bore
Posted by: castlesid
Date: December 12, 2009 06:38AM

Mike,

Never heard of anyone stretching the rover block to over 3.78" before, like to hear more about it was done, appears the cylinders are now siamesed and the water jackets between the top of the cylinders removed?

Kevin.


NixVegaGT
Nicolas Wiederhold
Minneapolis, MN
(659 posts)

Registered:
10/16/2007 05:30AM

Main British Car:
'73 Vega GT 4.9L Rover/Buick Stroker

authors avatar
Re: 4.020-inch Bore
Posted by: NixVegaGT
Date: December 12, 2009 07:12AM

Hot.
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WedgeWorks1
Mike Perkins
Ellicott City, Maryland
(460 posts)

Registered:
07/06/2008 08:07AM

Main British Car:
1980 Triumph TR8 3.5 Litre Rover V8

authors avatar
Re: 4.020-inch Bore
Posted by: WedgeWorks1
Date: December 12, 2009 09:38AM

Some machining, welding and a lot of experimentation!
MVC-100S.JPG


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: 4.020-inch Bore
Posted by: roverman
Date: December 12, 2009 11:42AM

Looks pretty impressive. How's the pressure test results? You didn't like the "Wildcat" symese block? Please post the dyno report. Thanks for the pic's, roverman.


Mr. T
Tony Andrews
Kent Island, Maryland
(153 posts)

Registered:
10/23/2007 03:59PM

Main British Car:
'75 mgb, '74 grille, morspeed bumpers Rover 3.9

authors avatar
Re: 4.020-inch Bore
Posted by: Mr. T
Date: December 12, 2009 01:12PM

That's a hell of a hole Mike - I'll have to get up there at some point and check out that monster!


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6469 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: 4.020-inch Bore
Posted by: BlownMGB-V8
Date: December 12, 2009 05:05PM

Not much left holding that block together is there.

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: 4.020-inch Bore
Posted by: roverman
Date: December 12, 2009 05:18PM

Jim and clan, I'm thinkin Nic just gotta hav-it to put his "Tractor Pull" crank in. Are you strokin to the beat, Nic ? lol, roverman.


castlesid
Kevin Jackson
Sidcup UK
(361 posts)

Registered:
11/18/2007 10:38AM

Main British Car:
1975 MGB GT Rover V8 4.35L

Re: 4.020-inch Bore
Posted by: castlesid
Date: December 12, 2009 05:25PM

Tony,

Must admit i'm totally confused by that picture, is the whole of the top part of the bore machined away?

Kevin.


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: 4.020-inch Bore
Posted by: roverman
Date: December 12, 2009 05:34PM

May I, Tony? Yes Kevin, It's "currently" the lightest, late model, Rover block in the world. Pressure test anyone? No matter how it "goes", we must applaud the effort and it's probably around $3k less than a Wildcat? roverman.


hoffbug
Tony Hoffer
Minnesota
(323 posts)

Registered:
10/15/2007 05:25PM

Main British Car:
Olds 215 EFI

Re: 4.020-inch Bore
Posted by: hoffbug
Date: December 12, 2009 06:35PM

Very cool..
That certainly solves the problem of cracks behind the liners.. doesnt it ! LOL
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NixVegaGT
Nicolas Wiederhold
Minneapolis, MN
(659 posts)

Registered:
10/16/2007 05:30AM

Main British Car:
'73 Vega GT 4.9L Rover/Buick Stroker

authors avatar
Re: 4.020-inch Bore
Posted by: NixVegaGT
Date: December 13, 2009 12:04AM

LOL! No doubt. That's a crazy looking pic.
Quote:
I'm thinkin Nic just gotta hav-it to put his "Tractor Pull" crank in.

You KNOW that is exactly what I was thinking!! Custom liners anyway, right? Make'em long enough to keep from pulling the piston out the bottom and 3.95" here we come!! Ha ha ha ha!!… Let's see. What would that be…

That comes out to 401cid! WOW. Pure motorhead porn. Seriously that pic of the block all hogged out. That's wicked.


WedgeWorks1
Mike Perkins
Ellicott City, Maryland
(460 posts)

Registered:
07/06/2008 08:07AM

Main British Car:
1980 Triumph TR8 3.5 Litre Rover V8

authors avatar
Re: 4.020-inch Bore
Posted by: WedgeWorks1
Date: December 13, 2009 07:49AM

Here is some more info, the holes for the head bolts in the block are extended by machining and welding. To cap it off a steel girdle on the bottom that is attched through the main bearing cap studs. Now with such a large bore what is the stroke/crank and what are the final numbers from the dyno? The goal is RPMs and Buick 340 OR Wildcat heads just to give a hint!
MVC-085S.JPG

MVC-087S.JPG


hoffbug
Tony Hoffer
Minnesota
(323 posts)

Registered:
10/15/2007 05:25PM

Main British Car:
Olds 215 EFI

Re: 4.020-inch Bore
Posted by: hoffbug
Date: December 13, 2009 08:32AM

http://forum.britishv8.org/file.php?6,file=4382,in_body_attachment=1

Has this type of mod been done before?

Im really left wondering how you keep the block from moving around .. The heads are definitly a sort of deck girdle now.. I keep thinking about some sort of indexing and doweling them for added rigidity over what the clamping force of the bolts provide.. But I dont think there is any room for that..



Edited 1 time(s). Last edit at 12/13/2009 08:35AM by hoffbug.


WedgeWorks1
Mike Perkins
Ellicott City, Maryland
(460 posts)

Registered:
07/06/2008 08:07AM

Main British Car:
1980 Triumph TR8 3.5 Litre Rover V8

authors avatar
Re: 4.020-inch Bore
Posted by: WedgeWorks1
Date: December 13, 2009 08:39AM

Well either this thing will hold together or be one hell of an expensive hand granade!



hoffbug
Tony Hoffer
Minnesota
(323 posts)

Registered:
10/15/2007 05:25PM

Main British Car:
Olds 215 EFI

Re: 4.020-inch Bore
Posted by: hoffbug
Date: December 13, 2009 09:00AM

Its very cool.. Thanks for posting this!
a couple of totally random thoughts. I know little to nothing about this type of work.. It just has my mind running all over...

Id try running the newer Evans waterless coolant in there.. you dont need a pressurized system for that...and it helps with bubbling in the hot spots..

as to trying up the lifter valley side and outside of the deck...Maybe look into some sort of ARP studs for the heads then have the heads indexed and then bush and hone out the head bolt holes for the tightest damn fit you can get.. Your heads are now a deck girdle..



Edited 1 time(s). Last edit at 12/13/2009 09:02AM by hoffbug.


WedgeWorks1
Mike Perkins
Ellicott City, Maryland
(460 posts)

Registered:
07/06/2008 08:07AM

Main British Car:
1980 Triumph TR8 3.5 Litre Rover V8

authors avatar
Re: 4.020-inch Bore
Posted by: WedgeWorks1
Date: December 13, 2009 09:32AM

Definately the ARP studs and there maybe some additional reinforcing between the cylinders and the lifter areas.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6469 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: 4.020-inch Bore
Posted by: BlownMGB-V8
Date: December 13, 2009 10:14AM

The TR4 motor as I recall looked very similar with the liners removed. Open deck, freestanding liners clamped by the head... it's been almost 30 years since I looked at one but Dan B should know. It was cast iron, but all the forces are contained within the liners so if they are clamped securely things shouldn't move.... much. I take it you have a step at the bottom for the liners to seat against?

It's a very impressive undertaking.

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: 4.020-inch Bore
Posted by: roverman
Date: December 13, 2009 11:50AM

Mike and clan, and did you mention, a helluve-lota-work? Drag race only motor? If so, I suggest,"Hardblock" or equivalent block filler, "Full" ! If you can't go full, you can try ,"Smokey" trick of sodium silicate(egg keep),100% sloshed around in "All" block coolant passages, drain excess and cure/dry.Pressure test?? "IF" full of block filler, you could bond the head studs into the filler,it's quite strong and this set-up looks like it needs all the help it can get. Unless you do something like this, I see little hope of holding the liners where they belong. Good Luck! roverman.
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NixVegaGT
Nicolas Wiederhold
Minneapolis, MN
(659 posts)

Registered:
10/16/2007 05:30AM

Main British Car:
'73 Vega GT 4.9L Rover/Buick Stroker

authors avatar
Re: 4.020-inch Bore
Posted by: NixVegaGT
Date: December 13, 2009 11:52AM

It looks like there is a step at the main casting comes into the block. Those liners definitely look long enough for the 350 (3.85") stroke, although, in reality, that's not such a good idea for the block. LOL. BUT an offset ground 4.6 crank to 3.5" would be nice. 355 cid.

I forgot to give out a hardy ha ha to the liner cracking fix, Tony. Good one. BACK TO WORK!

Mike, even if this doesn't work it's so fuckin' cool that I can't stand it.



Edited 1 time(s). Last edit at 12/13/2009 11:55AM by NixVegaGT.
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