Fuel injection system air flow meter "K-Jetronic"
1 - Venturi tube; 2 - pressure disc; 3 - adjusting screw for mixture quality (composition); 4 - counterweight; 5 - lock screw; 6 - distribution plunger leash; 7 - adjustment lever; 8 - movable lever of the pressure disk
The air flow meter is a Venturi tube 1, inside which a pressure disk 2 moves, fixed on a movable lever 8. The displacement of the pressure disk is transmitted through the lever to the distribution plunger of the fuel dispenser-distributor. The balance of parallel movements of the pressure disk of the air flow meter and the distribution plunger is ensured by counterweight 4.
Screw 3 is used to adjust the relative position of the air flow meter pressure disk and the fuel metering plunger, thereby changing the air-fuel ratio in the working mixture at all points of the acceleration curve. The position of screw 3 is adjusted at the factory. If necessary, screw 3 can be used to adjust the carbon monoxide (CO) content in the exhaust gases (when it is screwed down, the mixture becomes leaner).