Carburetor: Description and Operation

Fig. 2 Exploded view of Model 2150 carburetor. Exc. 1983 high altitude model:

Fig. 3 Exploded view of Model 2150 carburetor. 1983 high altitude model:

Motorcraft 2150 Carburetor
The Motorcraft 2150 carburetor, has two main bodies, the air horn and the throttle body.

The two bodies each contain;
- Main and Booster Venturi
- Main Fuel Discharge
- Accelerating Pump Discharge
- Idle Fuel Discharge
- Throttle Plate
- On some units, an anti-stall dashpot is attached to the carburetor when the vehicle is equipped with an automatic transmission.

The air horn assembly contains the choke plate and vents for the fuel bowl and covers the throttle body.
- For V6 applications, the air horn assembly also contains a fuel deceleration system consisting of a metered pickup orifice and air/fuel mixing orifices and bleeds.

The throttle body houses the throttle plate, accelerating pump, power (enrichment) valve and fuel bowl.

Choke Operation
The electrically heated choke opens the choke plate in 1 to 1-1/2 minutes when under hood temperatures are 55° to 60° or above.

The choke heater is energized while under hood temperatures are between 54 and 74° F.

Altitude Compensation
Some 2150 units are equipped with an altitude compensation aneroid to improve high altitude emission control and driveability.

Intake air entering the bypass valve is metered into the air flow above the throttle plates, leaning the mixture for high altitude operation.

Air flow is controlled by a valve activated by an aneroid attached to the rear of the carburetor main body.

An additional choke is added in the bypass air intake linked to the main choke.

Feedback Control
The air horn assembly on the feedback carburetor has an auxiliary fresh air intake for the duty cycle solenoid/altitude compensator.

Main body has a provision at the back to attach the duty cycle solenoid/altitude compensator as well as an opening that accepts auxiliary fresh air from the horn and channels that link up to the bleed circuits to the booster support assembly.

There is also a throttle angle potentiometer mounted on the throttle at the choke side.

The booster support assembly has cast in channels that flow bleed air to the idle and main system vacuum circuits.