Showing papers on "Spark-ignition engine published in 1971"

The piston crevice volume effect on exhaust hydrocarbon emission

Abstract: Exhaust hydrocarbon concentration reductions were determined for a revised design of spark ignition engine piston having a much narrower top land. Hydrocarbon concentrations with the revised design were 47 to 74 % lower than the production design, depending on engine speed and load. These results demonstrate the sizable reductions in exhaust hydrocarbon emission that are possible when the piston-bore-ring crevice volume is essentially eliminated. However, durability of the present design, while adequate for laboratory experiments, would be un-satisfactory in passenger car service.

Vehicular Emissions and Control

Abstract: Internal Combustion Engines, now, and for the immediate future, constitute the principal and preponderant contributors to atmospheric pollution. Battery powered or direct energy conversion vehicles may become an entity at some future date. However, for at least a decade, limitations in their application will preclude any significant replacement of combustion engines for vehicular propulsion.

Fluidic-fuel-metering system

Abstract: A novel carburetor arrangement for metering fuel to form a fuel-air mixture for delivery to a spark ignition engine which provides a single fuel-metering system for all engine operating conditions including idling as well as full load conditions. The preferred system features a unique combination of a fluid amplifier with a vortex amplifier for metering liquid fuel and discharging same into the airflow thereby converting an airstream into a uniform fuel-air mixture of substantially constant ratio of fuel-to-air for delivery to the engine.