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ztriumph
Zack Torman

(10 posts)

Registered:
01/15/2009 09:51AM

Main British Car:
4.0 liter high compression pistons?
Posted by: ztriumph
Date: July 22, 2010 05:11PM

Hello folks,

I am wondering if anyone know of a source whee I can get 11:1 CR pistons for the rove 4.0. I am interested in building this and the only pistons I can find are the forged ones. Does anyone know of a source where I can acquire pistons for this engine?

I currently have the 4.0 with 9.35:1 CR.

thanks!



Edited 1 time(s). Last edit at 07/22/2010 05:12PM by ztriumph.


bigaldart
Alan Grimes

(18 posts)

Registered:
02/20/2010 12:15PM

Main British Car:
Re: 4.0 liter high compression pistons?
Posted by: bigaldart
Date: July 23, 2010 07:28PM

Hi,

What forged 4.0 pistons have you found, source and price please, I am looking to move to 4.0 or 3.9 Rover from the 3.5 for next year and would prefer forgings, standard bore would be handy as well. Thanks in advance.

Alan


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: 4.0 liter high compression pistons?
Posted by: roverman
Date: July 24, 2010 04:11PM

I suggest you try the search feature here.This has been covered in-depth, ie. "D and D", likes the 255" V8 Ford piston. VW Type IV is available in forged. Good Luck, roverman.
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Wotland
Wotland Wotland

(105 posts)

Registered:
01/07/2008 08:14AM

Main British Car:
Re: 4.0 liter high compression pistons?
Posted by: Wotland
Date: July 25, 2010 05:35AM

I think to remember me you can use Ford Pinto 3.7" bore piston.


minorv8
Jukka Harkola

(269 posts)

Registered:
04/08/2009 06:50AM

Main British Car:
Morris Minor Rover V8

Re: 4.0 liter high compression pistons?
Posted by: minorv8
Date: July 25, 2010 05:47AM

There are flat top Mahle 94 mm pistons available for VW beetle engines , IIRC they were with the 24 mm pin as 4,0/4,6 litre engines and the comp height was just about right. They have coated skirts and look quite nice. One UK engine builder advised against using them because VW engine is air-cooled with cast iron cylinders and Rover is obviously water cooled alloy block. Something to do with different design specs vs. thermal expansion etc. I do know that locally they are very popular in Pinto rally engines so they should work just fine.


castlesid
Kevin Jackson
Sidcup UK
(361 posts)

Registered:
11/18/2007 10:38AM

Main British Car:
1975 MGB GT Rover V8 4.35L

Re: 4.0 liter high compression pistons?
Posted by: castlesid
Date: July 25, 2010 05:03PM

Zack,

These are worth a look.

[cgi.ebay.com] ...

You need to bush the rover rods 100 thou. and check the match of rod length and compression height, i know you can make them work with a 4.6 crank and 4.0 rods. Maybe find a 4.6 crank?

Kevin.


MGBV8
Carl Floyd
Kingsport, TN
(4514 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: 4.0 liter high compression pistons?
Posted by: MGBV8
Date: July 25, 2010 09:25PM

Hmmm, only 7 available?



minorv8
Jukka Harkola

(269 posts)

Registered:
04/08/2009 06:50AM

Main British Car:
Morris Minor Rover V8

Re: 4.0 liter high compression pistons?
Posted by: minorv8
Date: July 26, 2010 03:03AM

[www.pacificcustoms.com]

pin is 22 mm (not 24 mm), comp height around 35 mm


castlesid
Kevin Jackson
Sidcup UK
(361 posts)

Registered:
11/18/2007 10:38AM

Main British Car:
1975 MGB GT Rover V8 4.35L

Re: 4.0 liter high compression pistons?
Posted by: castlesid
Date: July 26, 2010 08:44AM

Carl,

7 Sets of 8 I think.

Kevin.


MGBV8
Carl Floyd
Kingsport, TN
(4514 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: 4.0 liter high compression pistons?
Posted by: MGBV8
Date: July 26, 2010 10:06PM

Of course. Thanks, Kevin

I believe that the 255 Ford piston that Art mentioned is used in a stroker build.


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: 4.0 liter high compression pistons?Yeah baby !
Posted by: roverman
Date: July 30, 2010 06:36PM

You heard it here-first ! Diamond Racing Pistons webb-site, inventory reduction sale(-50%).List $76.70ea. They show 76 pistons in stock. 3.700" bore with 1.220" comp. dist. You get to do math for rod/stroke, to make it work. Good Luck. roverman.
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