spiral-type supercharger movement of the displacement spiral function of the drive shaft and auxiliary shaft and of the balance weights air compression outwards-inwards toothed-belt driven auxiliary shaft description ordernumber 1122 see also: downdraught carburetor 1B1 VP 44 (Bosch) radial-piston distributor-type injection pump switch-over induction system two-stage carburetor 1B2E