urth stroke the remaining exhaust gases, withthe exception of the gases which will eventually remain in theclearance space, are expelled into the atmosphere. The Two-Stroke Cycle Petrol Engine.—We will now considervery briefly the two-stroke engine—^that is; an engine whichhas one working stroke… … Piston DisplacementFig. 51.—Indicator diagram of four-stroke engine. given in fig. 52. Imagine the piston at the top of its stroke,and that the petrol mixture in the combustion space has justbeen ignited. When the descending piston is near the end ofits working stroke, it uncovers an exhaust valve…
Airplanes
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