Showing papers on "Spark-ignition engine published in 1972"

Run-on prevention means for spark-ignition internal combustion engines including evaporative loss canisters

Abstract: A spark ignition engine is precluded from running-on or diseling by providing a solenoid valve which terminates the delivery of fuel to the induction system of the engine in the period during which the engine continues to rotate (due to the energy stored in the flywheel) after the ignition has been switched off. The solenoid is only energised for the period between the ignition being switched off and the engine ceasing to rotate.

Investigations of turbulent flow in the combustion chamber of a spark-ignition engine

Abstract: The thesis describes an investigation into the turbulent flow existing in the two limiting designs of spark ignition engine combustion chamber, i.e. 'squish' and cylindrical disc designs. The analysis is concentrated on the compression stroke and the early part of the expansion stroke. The application of hot-wire anemometry to such work is described especially with regard to anemometer adjustment for optimum frequency response and hot wire probe calibration. The latter was achieved by utilizing an analytical procedure in which a heat balance of the wire was generated. The varying effects of temperature, pressure and flow velocity on the wire's convective heat loss characteristics were catered for by the Nusselt Number–Reynolds Number relationship of Collis and Williams. Excellent calibrations were achieved. [Continues.]

Effects of temperature and fuel lead content on particulate formation in spark ignition engine exhaust

Abstract: Experiments were performed to determine the effects of temperature and lead content of the fuel on the weight and size distribution of particulates emitted from a spark ignition engine. The measurements were made using three different, specially constructed sampling systems which utilized filters and an Andersen Sampler for particle collection, and allowed sampling directly from the exhaust stream. The performance of these sampling systems was evaluated, and the conditions necessary for obtaining a representative sample of the exhaust stream were established. Measuring both leaded and unleaded fuels, the total weight of particles emitted using leaded fuel was approximately six times higher than with unleaded fuel. Particulate deposition on the inside of the exhaust system was also evaluated.