The performance, emissions and combustion
characteristics of a spark ignition engine
at varying compression ratio and spark timing using two grades of gasoline in
Saudi Arabian market, RON91 and RON95 have been presented on
this paper. The tests were conducted using a single cylinder, four-stroke spark ignition research engine that operates with
different RON fuel. The experiments were conducted at a wide-open throttle with
an engine speed of 2500 rpm at stoichiometric conditions for three different
compression ratios (9.5:1, 10:1, 10.5:1). At each compression ratio, the spark
timing was varied till knocking is detected. The performance
characteristics such as brake power, specific fuel consumption, thermal
efficiency, in-cylinder pressure, rate of heat release, and exhaust emissions
were analyzed. The data shows that the
increasing of compression ratio and spark timing increased the brake power and decreased the brake fuel consumption for
both type of fuels. Increasing compression ratio was more advantageous for
RON95 due to the auto-ignition resistance event. The NOx emission was insignificantly decreasing as compression ratio increases with
lower NOx emission from RON91. Compression ratio had considerable
effect on CO emission for both fuels.
Cite this paper
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