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Updated: May 4, 2025
The American artist heard with a vague smile the difference between the ordinary four-cycle engine of an automobile, and the two-cycle engine of this marine motor, with its piston receiving an impulse at each down stroke; tried to understand how the charge of vaporized petrol was drawn into the crank-chamber, and there slightly compressed; how the gas afterwards traveled along a by-pass into the firing chamber at the upper part of the cylinder, to be further compressed by the up-stroke of the piston and fired by the sparking plug, while the burnt gases escaped through a port uncovered by the piston in its downward strokes, admission and exhaust being thus controlled by the piston movement alone.
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