2013-3-6 Considering Reciprocating Internal Combustion Engines -Two Types Spark-ignition A mixture of fuel and air is ignited by a spark plua This type is advantageous for applications up to about 300hp(225kW. .lightweight and relatively low cost. predominantly used by automobiles in the U.S. Considering Reciprocating Internal Combustion Engines -Two Types Compression-ignition Air is compressed to a high pressure and temperature. Combustion occurs spontaneously when fuel is injected. This type is preferred for high-power applications and when fuel economy is required. used in heavy trucks and buses,locomotives and ships,and auxiliary power units 9 2013-3-6 9 Considering Reciprocating Internal Combustion Engines – Two Types ►Spark-ignition ►A mixture of fuel and air is ignited by a spark plug. ►This type is • advantageous for applications up to about 300 hp (225 kW). • lightweight and relatively low cost. • predominantly used by automobiles in the U.S. Considering Reciprocating Internal Combustion Engines – Two Types ►Compression-ignition ►Air is compressed to a high pressure and temperature. ►Combustion occurs spontaneously when fuel is injected. ►This type is • preferred for high-power applications and when fuel economy is required. • used in heavy trucks and buses, locomotives and ships, and auxiliary power units