Abstract: An air injection valve and air discharge manifold for supplying atmospheric air to the exhaust stream of an automotive engine includes an air injection valve for controlling the flow of air, with the valve including a tubular entry section and a unitary tubular exit section. The air discharge manifold includes a socket section for receiving the air injection valve and a conduit section for conducting air to the exhaust stream of the engine. The valve and air discharge manifold are connected by means of male and female rolled threads formed in the valve body and the connector portion of the air discharge manifold.

Abstract: An essentially unitary all plastic intake manifold has two essentially L-shaped sections facing one another to form a U-shaped assembly, the upper section including an air throttle body integral with an air plenum in turn integral with a plurality of laterally spaced tuned manifold runners, the lower section having an equal number of laterally spaced manifold runners connected to engine cylinder head intake ports, and a fuel system formed integral with the lower runners and including a fuel pressure regulator and fuel supply and return lines serially connecting fuel injector receiving cups providing a bottom feed of fuel to the injectors and a constant purge of fuel from the cups, for efficient engine operation.

Abstract: A free standing air bleed control module is connected to an automotive downdraft type carburetor only by tubing so that it can be located in any convenient position in the engine compartment and yet provide a complete air bleed function to the carburetor fuel lines without a new casting for the carburetor; the module containing a bleed air metering valve movable by a servo to control the flow of bleed air into the fuel lines of the carburetor, the servo being controlled by a computer sensitive to engine operating conditions to schedule the bleed of air at the desired time.

Abstract: A carburetor has a choke apparatus including a pulldown servo to crack open the choke valve a predetermined amount once the engine has attained a running condition, to lean the air/fuel mixture. The conventional bimetallic spring is included to slowly open the choke valve wider. A locking lever is provided to lock the choke valve against return to a more closed position than that attained by the pulldown servo, to prevent stalls due to cold engine loading and loss of vacuum; the lever, however, freely permitting opening of the choke valve and also including means to reset the locking lever so that the engine can be restarted with a closed choke valve.

Abstract: A carburetor has a vacuum servo that actuates a rotatable cam member to automatically rotate the fast idle cam off its high cam step engagement with the throttle valve adjustable idle stop screw while at the same time opening the choke valve to both lean the mixture and reduce mixture volume, for better emission control than when manually controlled as in conventional constructions.