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Video Carburettor
Video Single carburettor 1
Video Single carburettor 2
Video Ecotronic Carburettor
Video Const. Depr. Carbur.
Video Motorc. Carburettor 1
Video Motorc. Carburettor 2
Video 2-barrel Carburettor
Video Diaphragm Pump
Video Intake Pipe
Video Automatic Choke
Video Acceleration
Video Cold Idle Speed
Video Cold Start
Video Part Load
Video Transition
Video Full Load
Video Warm Idle Speed
Video Mikuni carburettors
Video 14 Tasks Carburettor

          A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Ecotronic Carburetor


The Ecotronic carburetor is a register carburetor with which the mixing proportion is changeable in almost every operational area and works together with the Lambda control.


The choke flap (here called the pre-throttle) works in the Ecotronic carburetor, not only during the cold start, but in all operational areas, and is operated by a servo-motor (incl. control device). Through brief closing of the pre-throttle, the mixture is enriched, through opening, it becomes leaner, exactly according to the signal from the Lambda sensor. So that this also functions during idling, the pre-throttle also controls the idling-needle valve through a linkage system.

Because of this regulation, some functions of the register carburetor are unnecessary, e.g., the acceleration mechanism. When accelerating, the pre-throttle is closed for a short period. The idling is regulated by a throttle-flap actuator and a control device as well. This uses the force of the negative atmospheric pressure to slightly open the throttle valve, or to close it. The controlling is done by two electro-magnetic valves.

Why has the Ecotronic carburetor not been able to assert itself? On the one hand, it cannot compete against the multi-point injection, and on the other hand, it is still more complex than a central injection. 05/10

First stage on the left, second on the right
In front on the left: choke valve
Right in front: vacuum actuator (operation 2nd layer)
At the rear on the right: throttle-flap controller.               Top of page               Index
2001-2015 Copyright programs, texts, animations, pictures: H. Huppertz - E-Mail
Translator: Don Leslie - Email:

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