Abstract: A spark ignition distributor assembly having air density compensating means is provided for use with an internal combustion engine. A first distributor plate is rotatably mounted between a first and second position within a housing while a second distributor plate in turn is rotatably mounted between a first and second position on and coaxial with the first distributor plate. A distributor shaft is rotatably journalled in the housing and extends coaxially through both distributor plates. An actuator connected to the shaft selectively actuates a make-and-break switch mounted on the second plate. The rotational position of one of the plates is controlled by the manifold vacuum of the engine while the rotational position of the other plate is controlled substantially by the density of the incoming air to the engine via appropriate sensing devices.

Abstract: A novel carburetor is provided which maintains a substantially constant fuel/air ratio in accordance with the density of the incoming air by variably controlling the fuel level in the carburetor fuel bowl. To accomplish this, a first and second lever are positioned between the fuel inlet valve to the carburetor fuel bowl and the float in the fuel bowl so that the position of each lever variably and independently variably controls the vertical position of the float at the point of closure of the fuel inlet valve, and hence the fuel level in the fuel bowl. An aneroid bellows controls the position of one lever while a temperature element controls the position of the other whereby the fuel level in the fuel bowl is proportionate to both air pressure and temperature, and hence the air density.