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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

Need bore spacings for inline 4 cylinders
Posted by: roverman
Date: October 02, 2012 08:49PM

I'm considering a "raw forging", to build a single plane rover v8 crank. When I locate an I4 with "close" bore centers, in a forging...... Side note, this should also fit the lotus 907 motor. Thanks, roverman.


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

authors avatar
Re: Need bore spacings for inline 4 cylinders
Posted by: BlownMGB-V8
Date: October 03, 2012 01:36PM

It will need to be a very big 4 cylinder and finding a big bore 4 with a short stroke might be iffy. But have you looked at the big Mercury? Mostly used in boats.

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: Need bore spacings for inline 4 cylinders
Posted by: roverman
Date: October 03, 2012 04:14PM

Jim and clan. 2.3lLPinto is 4.173",a little short. Lotus 907 is 4.25", but "cast" I haven't found b.s. for Ford, mod V8-yet. "RPM" makes a billet, for it. Single plane stroke to be 3.300.". Onward, roverman.
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302GT
Larry Shimp

(241 posts)

Registered:
11/17/2007 01:13PM

Main British Car:
1968 MGB GT Ford 302 crate engine

authors avatar
Re: Need bore spacings for inline 4 cylinders
Posted by: 302GT
Date: October 15, 2012 04:51PM

Consider an engine with wet cylinder liners; these tend to be longer. Two examples are TR4 and "classic" Alfa Romeo. Other possibilities are maybe a Mercedes 240 diesel or similar, or another 4 cylinder industrial engine. An industrial engine would probably have much extra metal that could eventually be machined off.


minorv8
Jukka Harkola

(269 posts)

Registered:
04/08/2009 06:50AM

Main British Car:
Morris Minor Rover V8

Re: Need bore spacings for inline 4 cylinders
Posted by: minorv8
Date: October 15, 2012 08:21PM

Art, have you ever heard of 2-litre Rover V8 engine, well actually a TVR supercharged version for Italy market. They were normal 3,5 in. Bore but with 40 mm stroke flat plane crank. I guess that equals about 1,6 inches... My friend bought one crank, if you need dimensions I can get them. I also have some pics that I can send you once I get home (I am currently "close" to you in NY ... at least on the same side of the Atlantic ocean)


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: Need bore spacings for inline 4 cylinders
Posted by: roverman
Date: October 16, 2012 11:31AM

Clan, According to "Tom" at Scat, the sbf/rover V8 crank, is ON again. Problem with 302 is 2.25" mains and limited to 3.25" stroke. Perhaps the Cleveland raw forging has potential ?In actuallity, Jukka, that crank you mention , might serve Fred Key, for his 32valve RV8 ? Cheers, roverman.


minorv8
Jukka Harkola

(269 posts)

Registered:
04/08/2009 06:50AM

Main British Car:
Morris Minor Rover V8

Re: Need bore spacings for inline 4 cylinders
Posted by: minorv8
Date: October 22, 2012 12:42PM

Pics of the flat plane crank, normal Rover V8 for reference...

Flat plane_4.jpg

Flat plane_5.jpg

Flat plane_2.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: Need bore spacings for inline 4 cylinders
Posted by: roverman
Date: October 22, 2012 02:03PM

Ok Jukka, your just "teasing" me now ? Pictured crank is not for sale-right ? Looks "short" on stroke. Thanks, roverman.


minorv8
Jukka Harkola

(269 posts)

Registered:
04/08/2009 06:50AM

Main British Car:
Morris Minor Rover V8

Re: Need bore spacings for inline 4 cylinders
Posted by: minorv8
Date: October 23, 2012 01:07AM

The stroke is 40 mm, std is 72 mm.

I can ask but I doubt itīs for sale. The interesting thing is the rod/piston combo. The rod length should be around 6,25-6,4" for reasonable piston height...


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: Need bore spacings for inline 4 cylinders
Posted by: roverman
Date: October 23, 2012 11:21AM

Ok, 1.574" stroke/2L V8 ? At some point, the crank begins to resemble a "cam". I suspect miniscule torque ? Onward, roverman.



Edited 1 time(s). Last edit at 11/02/2012 12:23PM by roverman.


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