offy 3 bbl

[Anonymous]

Does anyone have one of these? I am considering a different induction and this seems like a cool option. I think if I did use it I would go with those 34 ich webers. Does anyone recommend it? Would I get the same power from a 2bbl weber? Is there a way to put a Holly 390 cfm 4 bbl on my 200 inline 6? thanks.

 

[CobraSix]

First, is your car a daily driver? If so, personally I would (and I did) steer away from the offy. If you occasionally drive your car and go to a lot of shows..>Offy is great.

Definitely a power increase over the single 1V carb. Really opens up the power. Unfortunately it is mechanical operated, not vacuum, so it isn't really demand oriented. When I had mine one, combined with a new cam...got some good power, even a wheel chirp going into 2nd grear at 20 MPH.

The offy will have more power then a 2V mounted to the log head. now an Aussie head, that's a different story...I'll soon find out as I'm about to fit an Aussie head with a 2V to my 200 in lieu of my Offy set up that I've decided to abandon.

Slade

 

[CZLN6]

Howdy STP007:

Multi carbs are hard to beat for coolness, but they require alot in tuning, both in getting them right and maintainance. And as always, your induction must be coordinated with the rest of you engine/trans/gearing package. The issues/problems relating tofuel distribution on a long I6 are well served with 3X1s

The Offy manifold adaptor kit is really well done and Weber are easily tuned (but expensive). 3- 175 cfm one barrel carbs will have you over carbed, but the progressive linkage in the kit helps to moderated that. IMHO, 3X1s would be a better performance option then either Weber 2V option. The top end with 3X1s is awesome. A Weber 2V, might be a better option for a daily driver- excellent idle, economy, tuneability, and a good power increase.

Based on Slade's experience you might need to lighten some of the return springs on the linkage.

A Holley #8007 4V with 390CFM capacity, progressive, vacuum operated secondaries would be perfect for a small, street six, except that it is next to impossible to situate the carb so that the inside fuel bowl clears the valve cover. If you raise it enough to solve that problem, hood clearance becomes the issue. Modifying the log manifold to take advantage of the 4V requires some work too.

My "dream" project right now is to mount 2 Holley/Webers on a flat-topped log. I just have to "Get around to it".

Adios, David

 

[CobraSix]

Lavron has a good set up for the return springs. If you use the recommended weber carbs, then the Offy return springs are supposed to work. I went with Autolite 1100 because of low profile.

But like David said, you just can't beat the cool factor of the Offy...

Slade

 

[Guest]

David,

I have 2 DGV's along with a flat-top D7 head and have been contemplating such a swap. For a daily driver, do you think it would be manageable, or more geared towards a weekend warrior setup? This would be on a built US 250.

A buddy of mine is running dual IDFs on a VW motor and has constant problems with them. Needles gumming up...sticky plates, etc.. Not sure I want that hassle :roll:

Check out this page for discounted Weber carbs.

http://www.piercemanifolds.com/overstock.htm

Al

 

[CZLN6]

Howdy Al:

Not to worry Al. The DGVs are a whole different breed of cat then the IDFs. Pat Ganhal of Car Craft fame ran two DGVs on a Chevy 250 in a '32 coupe for many years. He used a modified Clifford manifold. His biggest hassle was keeping the linkage between the two carbs synchronized. Both carbs ran manual chokes. He claimed it was the smoothest idling and driving Hot Rod he ever had. If they last forever on Pintos and Rabbits, I can't see why they wouldn't be a big hit on a Mustang.

Adios, David

 

[Anonymous]

What carbs do you run on the OFFY 3x1 manifold?

Just curious, I am considering this setup.

Thanks

 

[CobraSix]

Technically, you can run any 1V carb that fits your intake normally. I chose Autolite 1100s for availability and low profile. Clifford recommends Webers.

It's really up to you, but be sure to measure for clearances.

Slade

 

[Kstang]

I have the holley 8007 on my 200. i Bought a oz head and the owner before me had adapted the manifold so that it could run a 4 barrel.
here are some pictures

just thought u might want to see these

 

[CobraSix]

I want your intake...

 

[Anonymous]

WOW! a 4bbl would be awesome!

 

[Anonymous]

I wonder if having the primaries closer to the rear 3 cylinders would affect performance? Mustangroo's son, Jason, has his carb set up perpendicular to the engine so that there is even fuel distribution. <br><br>
Photos Courtesy of Mr. Mustangroo

side note: Check out the 2" spacer below.

db

 

[xctasy]

Wow. An Induction to FordSix.Com

Yum, yum, yum. Don't stop now!

 

[CobraSix]

I think the perpendicular might be slightly better, but problems may occur from having the bowls side ways and you may not end up with an even squirt from both primary venturis.

Slade

 

[Anonymous]

If anyone has anything at all to add on fuel dispersion with four barrel carbs on sixes and modified 2V manifolds I would be very interested. Does increased height and area in the plenum help it disperse better.

 

[CobraSix]

Let's move that to a new topic...I'll start it...

Slade

 

[Anonymous]

stp007, to get this topic back on track a little, however you decide to go you'll find alot help (or opinions) here 8)

Personally I like my Offy, I've never had alot of trouble maintaning it, I think once you know what you need to do its really pretty simple.

Coolness abounds 8) 8) 8)

See Ya,
Mike

 

[CobraSix]

I'm not completely giving up on the Offy, just taking it off to do some more Research And Development of a Vacuum operated system. That will be the ideal fuel distribution set up.

Slade

 

[Anonymous]

Awesome guys, thanks for all the help. well, I'm considering the 4bbl,

mainly because i can use a vacuum advance with it, but also this is going

to be a daily driver, so its got to be relatively low maintenance(not having

to tune the carbs every 40 miles). my next question is, where can i have

the 2v manifold modified to accept the 4bbl? can i bring it to a machine

shop? thanks again.

 

[CobraSix]

I wouldn't sweat the vacuum advance. Most people get rid of that here. I haven't only because I haven't gotten around to it yet.

There may be a few approaches you can take. Most involve machine work. You may want to consider just running the 2V. better for a daily driver IMHO.

Slade