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

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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: Rover with two downdraft 2bbl carbs/Blower ?
Posted by: roverman
Date: December 26, 2010 01:23PM

The Offy 2x2bbl and 4bbl manifold is a very good starting point for a 6V-71 roots type blower,(GMC),installation. These were used on the V6's, and are 2" shorter on overall length.Output is 10% less than BIG 6-71. "Dyers Blowers" sells a mount/adapter plate, for this specific blower, and it welds nicely onto the Offy manifold. Whole package appears "correct". I bought this blower, N.O.S. for $200. These aren't mainstream so their pricing reflects that. USA Blowers prepped it and claims it will make 20 psi continous,(290" motor). I'll post pic's soon. Cheers, 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: Rover with two downdraft 2bbl carbs ?
Posted by: BlownMGB-V8
Date: December 30, 2010 11:04AM

Planning any sort of intercooler to go with that Art?

JB


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: Rover with two downdraft 2bbl carbs ?
Posted by: roverman
Date: December 30, 2010 02:28PM

Jim, Just the "fuel",(E85). According to Superchargers USA, these blowers "want" wet rotors. I had them hard anodized. I suspect the "Merlins" will make good blower heads ,with (6) studs per bore. Happy New Year y'all. 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: 5.7L Hemi with two downdraft 2bbl carbs ?
Posted by: roverman
Date: January 18, 2011 09:08PM

Thanks for the lead, Jim M. I'm considering if two of these would "feed" ,a built 5.7L hemi.I would like to use Edelbrock's dual plane/ dual quad manifold(a bargain). Real World price of a suitable controller ? Cheers, roverman.



Edited 1 time(s). Last edit at 01/18/2011 09:10PM by roverman.


devonrod
Dave Lowe

(5 posts)

Registered:
01/29/2011 02:43PM

Main British Car:
Re: Rover with two downdraft 2bbl carbs ?
Posted by: devonrod
Date: January 29, 2011 02:58PM

i will just leave these here- Edelbrock twin two barrel.
webber%2048%20IDF.jpg
austin devon oxw 891 008 (450 x 600).jpg


eyeosteverino
Steve Kimball
Southwest NM
(30 posts)

Registered:
03/02/2008 10:58AM

Main British Car:
67 Sunbeam, 2.8 L V6 Ford,

Re: Rover with two downdraft 2bbl carbs ?
Posted by: eyeosteverino
Date: February 28, 2011 10:01PM

Jim, This is late, but I bought a Offy 2x2 many years ago. my idea was to use up some of my SU carbs by mounting four, utilizing two home made "Y" adapters. Would look kinda cool, but would it work? Steve


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: Rover with two downdraft 2bbl , tbi's ?
Posted by: roverman
Date: March 01, 2011 02:15PM

Is smarter. Re-flashed/upgraded,GM # 227747 ecm., cost $430 from "bobr@dynamicefi". Add $75 to drive (4) injectors. NO AFFILIATION. roverman.



mgb260
Jim Nichols
Sequim,WA
(2465 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Rover with two downdraft 2bbl carbs ?
Posted by: mgb260
Date: March 03, 2011 12:54AM

Art, FAST EZ EFI. Looks like a Holley 4 barrel. Not cheap though.
Steve, I don't know if you meant Jim B. or me,but the "BOXER" manifold with 4 SU's looks just like you describe. Or maybe you can adapt the SU's to the Weber 2 barrels to 4 barrel adapter to a dual quad manifold.
FAST_30226.jpg
boxer_manifold_onRV8.jpg
boxer.jpg
99004_011.jpg



Edited 2 time(s). Last edit at 03/03/2011 12:28PM by mgb260.


eyeosteverino
Steve Kimball
Southwest NM
(30 posts)

Registered:
03/02/2008 10:58AM

Main British Car:
67 Sunbeam, 2.8 L V6 Ford,

Re: Rover with two downdraft 2bbl carbs ?
Posted by: eyeosteverino
Date: March 11, 2011 10:48PM

Jim N, That Boxer manifold looks tough. Is it some ones home made special? Hard to tell if it's cast of welded up. My idea would place the four carbs in aprox same place using the offy 2x2 with adaps. Somtimes I think I think too much about this stuff. Nah.


mgb260
Jim Nichols
Sequim,WA
(2465 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Rover with two downdraft 2bbl carbs ?
Posted by: mgb260
Date: March 11, 2011 11:24PM

Steve, I believe it's a British Rover racing manifold. I just thought you would like to see how the runners are spaced. Your idea would work fine.
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