Carter Afb Carburetor, Why Would The Secondaries Not Close?

How do carburetor secondaries work?

Vacuum – The secondary blades are attached to a vacuum diaphragm by a rod. The diaphragm is held in place by a spring. As rpm increases, so does the vacuum signal in the carburetor venturies. When the vacuum gets high enough, it overcomes the tension of the spring and moves the diaphragm.

What are secondaries on a carburetor?

A four-barrel carburetor has two primary and two secondary barrels. At idle and low-rpm driving, only the primary barrels open. The throttle blades on the secondary barrels stay closed. As the secondary barrels begin to open, more air travels through the carburetor, supplying the engine with the air and fuel it needs.

What does AFB stand for on a Carter carburetor?

In 1957, Carter started marketing the AFB series carburetor, and it quickly became a widely accepted standard for the automotive industry from the late Fifties into the late Sixties. AFB stands for “aluminum four barrel ” and this carburetor was used as original equipment on many OE performance engine options.

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Is Carter carburetor still in business?

Carter Carburetor Company in St. Louis, Missouri, was established in 1909, and ceased operation in 1985. It was founded by William Carter, who started experimenting with automotive carburetors while running a successful bicycle shop.

Does a 4 barrel carburetor add horsepower?

One of the easiest ways to upgrade your small-block V-8 American car is by changing from your stock two-barrel carburetion to a four-barrel intake manifold and carburetor. The advantage of this conversion will be a modest horsepower increase.

Is a 4 barrel carb better than a 2 barrel?

I know to most of you this sounds crazy but it’s the honest to God’s truth that 2 barrel carbs are actually bigger (in most cases) than 4 barrel carbs, which also means that 2 barrel carbs are more sluggish and get LESS gas mileage than 4 barrel carbs do, and here’s why: Most 2 barrel carbs are around 350 cfm.

Can you replace a 2 barrel carb with a 4 barrel?

Yes, there’s an adapter to install a 4 bbl, but it limits the flow to that of your 2bbl.

When should vacuum secondaries open?

Most double-pumper carbs are equipped with a progressive linkage that starts opening the secondaries when the primaries are about 40 percent open. There are kits that allow a quicker or later opening for fine tuning a road-race or dirt track car that is often on and off the throttle.

Can you put a 4 barrel carb on a 2 barrel intake?

Doing it with a four barrel into a two barrel intake it would never be able to flow enough into those two small passages to make much more power than a stock two barrel. But a cheap four barrel intake would be your best bet in my opinion. Good Luck.

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How do I know if my Carter AFB carb?

The Carter AFB carburetors are roll stamped with an identification marking at the right front base of the carburetor’s mounting ear. The top line of the roll stamp identification has the carburetor identification number.

How do I adjust my Carter AFB carburetor?

How to Adjust the Mixture on a Carter AFB

  1. Turn the engine on and allow it to warm up.
  2. Locate the two large slothead screws at the bottom of the front of the carburetor.
  3. Turn one air/fuel mixture screw in a clockwise direction with a slothead screwdriver with the engine idling until the engine speeds up.

What Carter Carburetor do I have?

Identify original equipment Carter carburetors by finding the letter “S” after the serial number of the carburetor. The serial numbers will be stamped onto the carburetor bowl. Identify all other Carter carburetors not listed above by referring to the tag on the side of the carburetor.

Who bought Carter carburetors?

William Carter only helmed the company for 13 years before American Car and Factory bought the company, and continued to run it as a standalone company until 1985. Carter models are still produced today by Weber and Edelbrock.

When did Carter carburetor go out of business?

During its operational life, the plant manufactured carburetors for gasoline- and diesel-powered engines. In 1984, ACF Industries Inc. closed the plant and dismantled much of the equipment.

Who makes quadrajet carburetor?

The Quadrajet is a four barrel carburetor, made by the Rochester Products Division of General Motors. Its first application was the new-for-1965 Chevy 396ci engine.

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