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Offy DP Intake Adapter to Autolite 2100 Two Barrel ?

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old28racer
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Offy DP Intake Adapter to Autolite 2100 Two Barrel ?

Post #1 by old28racer » Sat Jun 30, 2018 11:41 pm

Is there a carb adapter out there that will let me mount a Autolite 2100 two barrel carb to a Offy DP (dual port) four barrel intake?
I know I could make one if it was a Offy C intake with a single square opening, but the DP has a four hole opening.

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Backwoodswalker375
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Re: Offy DP Intake Adapter to Autolite 2100 Two Barrel ?

Post #2 by Backwoodswalker375 » Sun Jul 01, 2018 5:37 am

Mr. Gasket 1929 will do what you are wanting. If memory is right, I had to use a thick 2 barrel gasket for clearance. It worked but not the best. You will be ruining all the good things that manifold offers. Owner ended up with edelbrock 500 cfm on top of 4 hole phenolic spacer. Ran great.

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Re: Offy DP Intake Adapter to Autolite 2100 Two Barrel ?

Post #3 by Harte3 » Sun Jul 01, 2018 1:29 pm

To the best of my knowledge, no such animal exists.
'83 F150 300, 0.030 over, Offy DP, Holley 4160/1848-1 465 cfm, Comp Cam 260H. P/P head, EFI exhaust manifolds, Walker Y Pipe, Super Cat, Turbo muffler, Recurved DSII, Mallory HyFire 6a, ACCEL Super Stock Coil, Taylor 8mm Wires, EFI plugs.

Backwoodswalker375
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Re: Offy DP Intake Adapter to Autolite 2100 Two Barrel ?

Post #4 by Backwoodswalker375 » Sun Jul 01, 2018 2:05 pm

I will dig around and see if I still have the adapter. It was just a common 4 barrel to 2 barrel adapter. The 4 barrel side mounted to the offy intake. The 2 barrel had the motorcraft holes. It seems like the thick gasket was needed on 2 barrel side because butterflies hit intake. It ran but not the best. Was no longer a "dual plane" intake. Worked long enough for him to save for edelbrock 500. This was about 20 years ago. But it did run

Fordman75
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Re: Offy DP Intake Adapter to Autolite 2100 Two Barrel ?

Post #5 by Fordman75 » Sun Jul 01, 2018 3:08 pm

If you want to run a 2V carb I'd just sell the DP and get a C-series ( or trade it for a C-series ) . The DP is the wrong intake to mess with adapters on. You can use the same adapters you would on a C-series but not only do you end up with the DP's restrictive runners then you also run into the adapter openings being partially blocked off. You can try to get around all of this by running a 1"-2" open 4V carb spacer below the 4v-2V carb adapter. It will run but it's way less efficient then a adapter on a C-series.

I've owned some DP intakes and just think they are a waste of money.
Ted

54 Ford F100/F150 4x4
300, NP435 4spd, NP205 transfercase

old28racer
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Re: Offy DP Intake Adapter to Autolite 2100 Two Barrel ?

Post #6 by old28racer » Sun Jul 01, 2018 6:29 pm

Fordman 75 ---Well Ted, I have to agree with you on the DP intake, great during the gas wars out this way in CA but other than that a none performance intake. The C are a bit high dollar for setting a 2V carb on and they don't show up at auto swap meets very often. This is a junk idea. :mrgreen:

Anyone got a stock 240 or 300 carb intake they would pass my way for shipping cost so I can hog it out and tapper the bottom to work with a home made plate adapter to mount a 2100 or a 2GC like FTF suggested. I am just looking for a little more out of my 1969 240 F100. I did the same thing to a Chevy 194 1V intake with a 2GC carb and it ran real nice.
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Backwoodswalker375
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Re: Offy DP Intake Adapter to Autolite 2100 Two Barrel ?

Post #7 by Backwoodswalker375 » Sun Jul 01, 2018 7:58 pm

Pm me your address. If you can wait till after the 4th I will send you one. I won't be him till the 5th. You are welcome to one
Please post on here what you do for others.

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Re: Offy DP Intake Adapter to Autolite 2100 Two Barrel ?

Post #8 by Harte3 » Sun Jul 01, 2018 9:21 pm

ci/LogMods.html#2VC

There is an article with pictures found in the Tech Section...
'83 F150 300, 0.030 over, Offy DP, Holley 4160/1848-1 465 cfm, Comp Cam 260H. P/P head, EFI exhaust manifolds, Walker Y Pipe, Super Cat, Turbo muffler, Recurved DSII, Mallory HyFire 6a, ACCEL Super Stock Coil, Taylor 8mm Wires, EFI plugs.

old28racer
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Re: Offy DP Intake Adapter to Autolite 2100 Two Barrel ?

Post #9 by old28racer » Sun Jul 01, 2018 10:53 pm

Harte3 -- Thanks for the great article & pictures. That is what I call A full hog out job. Very nice and gives me a few ideas.

Backwoodswalker375 -- PM sent, thanks again. Have a nice / safe 4th :beer:
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THE FRENCHTOWN FLYER
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Re: Offy DP Intake Adapter to Autolite 2100 Two Barrel ?

Post #10 by THE FRENCHTOWN FLYER » Mon Jul 02, 2018 6:55 am

I'm surprised nobody has suggested just hogging out the inside of the DP, making it one large plenum volume.
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Re: Offy DP Intake Adapter to Autolite 2100 Two Barrel ?

Post #11 by Fordman75 » Mon Jul 02, 2018 3:06 pm

THE FRENCHTOWN FLYER wrote:I'm surprised nobody has suggested just hogging out the inside of the DP, making it one large plenum volume.


You can do that, but you've still got the runners to deal with. And you can't reach it all without cutting the manifold apart. But if you can get a used DP dirt cheap go ahead and hog it out.
Ted

54 Ford F100/F150 4x4
300, NP435 4spd, NP205 transfercase

old28racer
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Re: Offy DP Intake Adapter to Autolite 2100 Two Barrel ?

Post #12 by old28racer » Mon Jul 02, 2018 4:49 pm

FTF & Fordman75 --- I got this DP dirt cheap and I might give it a try. If I open the main chamber to more or less a square shape down to the upper & lower runner floors and taper the center bottom edge between the two I think it might work. I know I will still have the original runner restriction but it should still flow better than a hogged out original 1V intake.
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Re: Offy DP Intake Adapter to Autolite 2100 Two Barrel ?

Post #13 by Fordman75 » Mon Jul 02, 2018 6:09 pm

old28racer wrote:FTF & Fordman75 --- I got this DP dirt cheap and I might give it a try. If I open the main chamber to more or less a square shape down to the upper & lower runner floors and taper the center bottom edge between the two I think it might work. I know I will still have the original runner restriction but it should still flow better than a hogged out original 1V intake.


Want you would want to do is remove enough material so you've got a open/common plenum that feeds both halves of all the intake runners/ports. Make sure there isn't anything that would act as a obstruction. Unless you are trying to guide the flow one way or thew other. After that it would be up to you if you wanted to remove the runner dividers as far as you could or just leave them.


I'd prefer to take a efi lower and build a plenum to run 2 or 3 2100's on it. You could resell the DP and make a chunk of change on it. :D But I like multi carb set ups on a 240/300. Even a mild/stock one.

Or get 3 stock intakes and do a little cutting/welding and make a triple carb set up like FTF did.
Ted

54 Ford F100/F150 4x4
300, NP435 4spd, NP205 transfercase

old28racer
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Re: Offy DP Intake Adapter to Autolite 2100 Two Barrel ?

Post #14 by old28racer » Mon Jul 02, 2018 7:19 pm

Ted, thanks for the reply and some ideas. I just sent my lower EFI intake tube setup to my buddy in Stillwater, MN. He is going to build a 2x2 plenum with dual 1.14 2100 carbs. The setup will go on his 300 powered front motor vintage dragster.
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