Is My Motorcraft 2150 Carburetor Choke Pulldown Diaphragm Missing - Ford Mustang Forum

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post #1 of 3 (permalink) Old 08-15-2010 Thread Starter
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Is My Motorcraft 2150 Carburetor Choke Pulldown Diaphragm Missing

Guys I believe I own the Motorcraft 2150 carburetor. It does say Motorcraft on it, but all other tags are missing. A manual I found on the internet states:

Motorcraft 2150 2V Carburetor

All Motorcraft 2150 carburetors are equipped with one of three automatic choke systems.

  • Hot-air choke
  • Hot-air choke with electric assist
  • Electric choke
Ok, so far so good mine looks like one of the Hot-air varieties, but then I see the diagram shows something called the "Choke Pulldown Diaphragm" #2 in the first picture which mine does not have. So I search the internet and find pictures on eBay of a carb similar to mine but with an electric choke and it's also without the diaphragm (green picture), so now I'm confused do some of them not come with the diaphragm, or is mine missing one? (see last pic with the carb upside down showing the two vertical bolt holes where the diaphragm could mount up to.)

Please explain.

(Yes i should ditch it for a four barrel, and I already bought a Holley but this is just a matter of principal now, lol)

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post #2 of 3 (permalink) Old 08-16-2010
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The early meaning vintage 2100 series has a piston inside the choke housing that gets manifold vacuum thru a passage in the carb on pic 2,3. this carb looks to be in rough shape. These pictures are from different years , pic 1 looks like from the middle to late 70's, pics 2,3 are vintage middle 60's, and pic 4 is about 1970, there has been several changes throughout the years, the carb in pics 2,3 are rated at about 250 cfm, it is only good for a restoration, for performance its poor, they are good carbs, but you have to decide on what you are going to do. If you want performance, you need a 4b and intake, you didn't say what engine you had. Good Luck.

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post #3 of 3 (permalink) Old 08-16-2010 Thread Starter
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Thank you for your feedback much appreicated

Sorry I should have said it's from a 1976 302 with C4 automatic transmission.

I have the 1.21 venturi size which crresponds with 351 CFM according to this chart, but they go up to 424 CFM.

These numbers are for 2V carburetors only (2100/2150). The first numbers are the Venturi Size, the second is the corresponding CFM.

.98 = 190
1.01 = 240
1.02 = 245
1.08 = 287
1.14 = 300
1.21 = 351
1.23 = 356
1.33 = 424

FYI, the carb has been soaked and rebuilt (twice) since, so it looks better now.
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