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harv8
Martyn Harvey
Waterloo, Ontario, Canada
(189 posts)

Registered:
10/23/2007 10:09PM

Main British Car:
MGB Rover V8, TVR Chevy V8, MGB GT Ford V8

authors avatar
WTB JWR Offy 7001 Intake Manifold
Posted by: harv8
Date: July 02, 2021 10:12PM

Looking for a JWR Offenhauser Intake Manifold


88v8
Ivor Duarte
Gloucestershire UK
(1041 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
1974 Land Rover Lightweight V8

Re: WTB JWR Offy 7001 Intake Manifold
Posted by: 88v8
Date: July 03, 2021 04:34AM

The dual port?
I have one on my Rover V8.
Still available new. [www.woolfe.uk]

Ivor


joe_padavano
Joseph Padavano
Northern Virginia
(156 posts)

Registered:
02/15/2010 03:49PM

Main British Car:
1962 F-85 Deluxe wagon 215 Olds

Re: WTB JWR Offy 7001 Intake Manifold
Posted by: joe_padavano
Date: July 03, 2021 09:48AM

Those Offy dual port intakes are the goofiest design ever. It should tell you something that in the half century since those were introduced, not one other manufacturer has ever made an intake with that design (and no, any patents expired decades ago). It's two flat single plane intakes, one for the primaries and one for the secondaries. Crappy flow with no benefits, and the lower profile on this one just makes it worse.
Screenshot 2021-07-03 at 09-43-37 IMG .png


88v8
Ivor Duarte
Gloucestershire UK
(1041 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
1974 Land Rover Lightweight V8

Re: WTB JWR Offy 7001 Intake Manifold
Posted by: 88v8
Date: July 03, 2021 10:50AM

With the small runners it was designed to give high air velocity at low revs. More about torque and fuel consumption than HP.

Some discussion here [www.speed-talk.com]

I suspect that a lot of users including me would get better results after a rolling road carb setup. That would make way more difference than a change of manifold.

Ivor


joe_padavano
Joseph Padavano
Northern Virginia
(156 posts)

Registered:
02/15/2010 03:49PM

Main British Car:
1962 F-85 Deluxe wagon 215 Olds

Re: WTB JWR Offy 7001 Intake Manifold
Posted by: joe_padavano
Date: July 04, 2021 08:48AM

"With the small runners it was designed to give high air velocity at low revs. More about torque and fuel consumption than HP. "

Sorry, but that flat, wide single plane plenum is NOT going to give you "high air velocity at low revs". You want signal at the carb, and this doesn't do that for you. The divider actually hurts top end flow, which is what you want a single plane intake for. Again, if this was such a great idea, why has NO ONE copied it in the last half a century? It's a gimmick. While you're at it, get one of those "Tornado" things to go under the carb.


MGBV8
Carl Floyd
Kingsport, TN
(4511 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: WTB JWR Offy 7001 Intake Manifold
Posted by: MGBV8
Date: July 04, 2021 11:22AM

I'm with Joe. I have never been a fan of those.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6468 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: WTB JWR Offy 7001 Intake Manifold
Posted by: BlownMGB-V8
Date: July 04, 2021 11:42AM

I had one, wasn't impressed with it. Might be OK if you cut out the dividers. That's what I did when I turned it into the base for a blower intake.

Jim



88v8
Ivor Duarte
Gloucestershire UK
(1041 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
1974 Land Rover Lightweight V8

Re: WTB JWR Offy 7001 Intake Manifold
Posted by: 88v8
Date: July 05, 2021 04:36AM

The 'Tornado', is that like the Mangoletsi Manifold Modifier, I had a pair of them with my SUs :}
[www.mangoletsimanifolds.com]

Ivor


88v8
Ivor Duarte
Gloucestershire UK
(1041 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
1974 Land Rover Lightweight V8

Re: WTB JWR Offy 7001 Intake Manifold
Posted by: 88v8
Date: July 05, 2021 04:48AM

Now there's more on the dual port in the Drivetrain forum here [forum.britishv8.org]

Ivor


harv8
Martyn Harvey
Waterloo, Ontario, Canada
(189 posts)

Registered:
10/23/2007 10:09PM

Main British Car:
MGB Rover V8, TVR Chevy V8, MGB GT Ford V8

authors avatar
Re: WTB JWR Offy 7001 Intake Manifold
Posted by: harv8
Date: July 05, 2021 11:06AM

Asking for a friend LOL


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