Carburetor Pierburg 1B3 — technical characteristics (Audi 100 C3)

The engine of the "DR" model was equipped with a Pierburg 1B3 emulsion-type carburetor, single-chamber, with an automatic starting and heating device of a mixed type, which uses a bimetallic spring with electric heating and circulation of heated liquid from the engine cooling system, with an accelerating piston pump, an economizer of power modes, an economizer with electric heating of the carburetor body, air heating in front of the intake manifold and an electromagnetic shut-off valve of the idle system.

Ng carburetor according to the Audi catalogue:

• cars with manual transmission: 026 120 015B;
• cars with automatic transmission: 026 120 015C.

Calibration data

Diffuser diameter, mm: 24.

Main dosing system:

• fuel jet marking: X112.5 (110.5)*;
• emulsion tube marking: 90.

Main idle system:

• fuel jet marking: 47.5;
• air jet marking: 130.

Econostat:

• fuel jet marking: 37.5;
• air jet marking: 130.

Needle valve opening diameter, mm: 1.75.

Diameter of fuel jet of power mode economizer, mm: 0.50.

Accelerator pump nozzle diameter, mm 0.40 (0.45)*.

Fuel supply by the accelerator pump per 1 cycle, cm: 0.9±0.15.

Starting clearances of the air damper, mm

• 1st stage: 2.3±0.15 (2.1±0.15)*;
• 2nd stage: 3.0±0.15.

Speed of rotation of the cold engine crankshaft at idle, rpm: 3400-3800.

Automatic starting device marking. 251 (250)*.

Crankshaft speed of a warm engine at idle speed, rpm: 700-800.

Carbon monoxide (CO) content in exhaust gases, no more than, %: 1.0±0.5.

* Data in brackets is for vehicles with automatic transmission.