Abstract
The objective of the present study is to observe the effect of CNG operation of a two-stroke engine and to show the possibility of self-ignition combustion in the CNG fueled operation. A water-cooled vertical in-line two-cylinder marine-racing engine with a stroke volume of 397 cc was used as the test engine. The compression ratio was varied from 8.6 (original) to 14.5 in order to investigate the effect of compression ratio increase and to realize self-ignition combustion. CNG fueled operation was shown to be successful under a wide range of operating conditions including wide-open throttle condition and an engine speed of 6300 rpm. Self-ignition combustion occurred at certain engine operating conditions. Low gasoline equivalent BSFC, low HC and NO x emissions, and improvement of the cyclic variability, were attained by applying self-ignition combustion.
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