Offenhauser Carb Choice

[cjperry81]

I have a stock 200. I have been talking to a bunch of you about how to get some performance out of my 200 so thanks for all of the tips. Well i found an Offenhauser manifold that will allow me to put 3 single carbs on it. I think it looks awesome and wanna give it a try. What type of carbs do you recommend. I know that there are Carters and Webers that alot of people talk about but specifically which ones would be good for a set up like this? If I do this will i have to get an aftermarket fuel pump to supply more fuel? Also is there anything else that I would need to change off hand in order to run this manifold and setup?

CP

 

[bubba22349]

Usally the 3x2's use the Holley, Autolite, or Carter carbs which do you have on it now?

 

[CobraSix]

When I had mine, I went with Autolite 1100s. Cheap and solid performers. I also wanted lower profile so I could fit the Cobra oval under the hood.

 

[powerband]

Most linkage is progressive set up, whichever carb you choose , the center carb will determine most of the drivability. A good running carb suited to the engines' typical CFM requirements will help get the outer kick-in-pants carbs dialed in...

1100's, RBS, YF.s, 190X, There are many variations of usable carbs, some good some not so...

Have Fun

 

[cjperry81]

Carbs are a little over my head but whatever I have on it now is the stock single barrel. It works fine because I had it rebuilt a few months ago to work out some bugs but Im really liking the 3 carb set up. I will look into the 1100's. Will i need to alter my fuel pump in order to make up for the increase in carb capacity? I have a stock pump on it now.

PS: Powerband I love the pic of that set up. That is exactly what im aiming for.

 

[CobraSix]

My stock pump worked fine.

If you don't like messing with carbs, then 1100 is the way to go. However, it may be wise to steer away from the multi carb set up if you don't like playing with carbs. multi carb engines require a little more work to keep in top running condition.

 

[mugsy]

I want to say that Clifford puts a Weber 34ICH on the center hole because that carb comes with a choke. As stated earlier the center carb is the one that runs the entire time. It need the idle circuit, the choke system and vac advance to the dizzy. The end carbs are 34ICTs. They do not come with a choke. These carbs are fairly plentiful, they came on VW bugs. Search on evil-bay and you should find a bunch of stuff for them.

When I rebuilt my motor I installed an Offy triple carb set up with ICTs on the ends and I went to a local O'Reilley's and ordered a carb for a '69 Mustang with a 250 as the "center" carb. I had recently switched to a DuraSpark dizzy and wanted the correct type of carb. They sold me a Carter YF one bbl. Long story real short: I ended up buying a new head and swapped it on so I could run just a single carb. But what I'm find out is that the center carb barely works, the new dizzy (also bought at O'Reilley's) was junk, and one of the end ICTs has an off center throttle plate and will not seal.

I did have some issues with the Offy manifold. One was the nuts that held the little 90* throttle arms would back off. I tried jam nuts but nothing held. Also the three studs that the arms mount on would also back out of the adapter. As soon as I get a decent running "center" carb I'll probably swap the three hole Offy head back on and enjoy that!!!

 

[CobraSix]

I did have some issues with the Offy manifold. One was the nuts that held the little 90* throttle arms would back off. I tried jam nuts but nothing held. Also the three studs that the arms mount on would also back out of the adapter. As soon as I get a decent running "center" carb I'll probably swap the three hole Offy head back on and enjoy that!!!

I once had the bright idea of using nylock nuts on the throttle arms. Never occurred to me (until later sitting on the road) that the nylon would melt that close to the exhaust.

 

[1bad6t]

I once had the bright idea of using nylock nuts on the throttle arms. Never occurred to me (until later sitting on the road) that the nylon would melt that close to the exhaust.

To make a lock nut...smash the side of the nut with a hammer to make the nut more oval than round. Bigger the nut...bigger the hammer. Works every time.

 

[mugsy]

I did have some issues with the Offy manifold. One was the nuts that held the little 90* throttle arms would back off. I tried jam nuts but nothing held. Also the three studs that the arms mount on would also back out of the adapter. As soon as I get a decent running "center" carb I'll probably swap the three hole Offy head back on and enjoy that!!!

I once had the bright idea of using nylock nuts on the throttle arms. Never occurred to me (until later sitting on the road) that the nylon would melt that close to the exhaust.

I've used the nylon lock nuts once and it didn't work. It was in a different application, but the technology didn't perform. I have zero faith in 'em now. I double nut if I need the things to stay. And you are right, that close to the header is not a good idea.

 

[CobraSix]

I've used the nylon lock nuts once and it didn't work. It was in a different application, but the technology didn't perform. I have zero faith in 'em now. I double nut if I need the things to stay. And you are right, that close to the header is not a good idea.

To quote my father:

"All the mistakes in my life seemed like a good idea at the time"

It's amazing how obvious things appear later. I'll have to see if I have pictures of how I fixed the issue. If I recall, I either replaced the bolts with a shaft and cotter pin arrangement, or I drilled the bolt shank to accept a cotter pin and used washers to shim the gap.

I've never used nylocks for anything ever since.

 

[mugsy]

I've used the nylon lock nuts once and it didn't work. It was in a different application, but the technology didn't perform. I have zero faith in 'em now. I double nut if I need the things to stay. And you are right, that close to the header is not a good idea.

To quote my father:

"All the mistakes in my life seemed like a good idea at the time"

It's amazing how obvious things appear later. I'll have to see if I have pictures of how I fixed the issue. If I recall, I either replaced the bolts with a shaft and cotter pin arrangement, or I drilled the bolt shank to accept a cotter pin and used washers to shim the gap.

I've never used nylocks for anything ever since.

The Offy manifold came with studs to mount the arms and nylon nuts to hold them on. As stated earlier, I didn't use the nylon lock nuts. And its funny/ironic that Cobra6 had them fail. I was actually surprised to see them in the kit and thought, "boy, the person who spec'ed or put them in here has never seen how close the exhaust manifold/header is." So I didn't use them and glad to know that I was right all along!! I actually predicted something right this time

As for the the stud, they backed out too. I think I will get some type of set screw machined in the bottom to hold the studs.

Anyway, I'm trying not to hijack this tread. My point is that you buy the Offy adapter and then you still have a bunch of stuff to figure out BESIDES the carbs. This is not a "plug-n-play" set-up as it comes out of the box in my opinion. Maybe others have had better luck than I?

 

[MPGmustang]

Best center carb that works perfectly = Pony Vaporizer :roll:

then get your cheap 1100's for the ends... I would even try and test them all before using them so you know that they all work the same. I think (don't know) that is half the battle.

 

[mugsy]

OK, how do you get the little gray box with the quotes in it? I've hit the quote box thingy and obviously it doesn't work for me

 

[MPGmustang]

OH!!! i figured it out... there is a check box

"disable BBCode" keep it unchecked....

 

[mugsy]

OH!!! i figured it out... there is a check box

"disable BBCode" keep it unchecked....

Well let's see if this works....

 

[mugsy]

THANK YOU!!!!!!!!!!!!!!!!!