Spark-ignition engine

About: Spark-ignition engine is a research topic. Over the lifetime, 4352 publications have been published within this topic receiving 66550 citations.

Development of a natural gas spark ignition engine for optimum performance

Abstract: A 4 litre displacement, six cylinder, fuel injected petrol engine was modified to natural gas (NG) fuelling. Experimental investigation was carried out with various mixture controls and compression ratios over a wide range of operating conditions. As a strategy for combustion chamber shape modification, the compression ratio was raised with simultaneous enhancement of in-cylinder turbulence through squish motion. A fast burning chamber for the combustion of lean mixtures of natural gas and air was developed. Brake thermal efficiency in excess of 40 per cent and brake torque in excess of the peak base torque with petrol were achieved. The research provides the foundation for the implementation of NG cars that will emit only about 65 per cent of the carbon dioxide (CO2) of their petrol engine counterparts, with the prospect of extending the limited range of NG cars by up to one-third and producing low hydrocarbon (HC) and nitrogen oxide (NOx) emissions.

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.