Abstract: An exhaust manifold with several inlet ports and a combination of diffuser and nozzle portions associated with each inlet port for producing a high flow rate and a low pressure drop from entry to exit. The diffuser and nozzle portions are in series and designed into the manifold at each inlet port and slightly upstream of the next downstream positioned inlet port. The diffuser portion decreases the velocity of exhaust gasses as they enter the manifold and are then turned substantially ninety degrees into a longitudinal direction of the manifold. This diffuser action slows the velocity and reduces pressure losses as the turn of exhaust flow is accomplished. The next in series nozzle portion increases the velocity of exhaust gases to cause the flowstream to jump past a neighboring downstream engine exhaust port. Resultantly, the flow through the manifold is improved and the pressure drop decreased which enhances engine performance.

Abstract: End seals having a large compressibility range are mounted by their adhesive underlayer to support surfaces of an engine block and are formed with transverse notches in opposite ends to receive a given quantity of silicone or other suitable sealant. The end seals mate with intake manifold gaskets which may have notches therein that align with the notches of the end seals for receiving the sealant. The end seal, the head and intake manifold gaskets terminate at junctures of the engine block, cylinder heads and manifold which define recesses therebetween providing potential oil leak paths. These paths are effectively sealed as the manifold is connected to the cylinder head and block assembly causing the end seals to be compressed and the sealant to be squeezed into the recesses so that the gaskets and the end seal are joined in an oil sealing manner.

Abstract: An automotive emission control system in which the engine timing is advanced an amount that is supplemental to the normal part throttle advance, in response to exhaust gas recirculation (EGR) flow, to compensate for the slower burning rate due to EGR dilution of the engine intake charge, the EGR flow being accomplished by an engine driven air pump pressure controlled by an air pump pressure modified by manifold vacuum so as to be speed and load responsive, the triggering pressure also being applied to the ignition timing distributor servo.