WTB JWR Offy 7001 Intake Manifold

[harv8]

Looking for a JWR  Offenhauser Intake Manifold

[88v8]

The dual port?
I have one on my Rover V8.
Still available new. https://www.woolfe.uk/product/jwr-7001-offenhauser-dual-port-intake-manifold-4bbl/

Ivor

[joe_padavano]

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.

[88v8]

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 https://www.speed-talk.com/forum/viewtopic.php?f=1&t=10514

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]

"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]

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

[BlownMGB-V8]

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]

The 'Tornado', is that like the Mangoletsi Manifold Modifier, I had a pair of them with my SUs :}
http://www.mangoletsimanifolds.com/images/photos/petroleconomizer.pdf

Ivor

[88v8]

Now there's more on the dual port in the Drivetrain forum here http://forum.britishv8.org/read.php?6,68730

Ivor

[harv8]

Asking for a friend LOL