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TECH SERIES: POWER PRINCIPLES: Engine porting and timing explained
WORDS DAVE GIEIRKE PHOTOS PETE HALL ILLUSTRATION CHRIS MENDOLA THE RECIPROCATING MOTION (up and down) of an engine's piston allows it act as an air pump. Initially, the air/fuel mixture is moved into the crankcase below the piston, and then it's forced into the cylinder (above the piston) where it's compressed and ignited. As the gases burn, temperatureóand pressureósoars. This pressure forces the piston toward the bottom of its stroke to where exhaust gases are...
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