Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . that the burned gases areblown out or scavenged. This reduces the air in the crank caseto atmospheric pressure. After the piston passes C, the air inthe crank case is rarified, as no air can enter, and after passingB the air in the cylinder is compressed. When the pistontravels back far enough to uncover port E air is drawn into INTERNAL COMBUSTION ENGINES 367 the crank case from the base of the engine by the partial vacuumexisting there. In the Mietz and Weiss engine kerosene issprayed in
Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . that the burned gases areblown out or scavenged. This reduces the air in the crank caseto atmospheric pressure. After the piston passes C, the air inthe crank case is rarified, as no air can enter, and after passingB the air in the cylinder is compressed. When the pistontravels back far enough to uncover port E air is drawn into INTERNAL COMBUSTION ENGINES 367 the crank case from the base of the engine by the partial vacuumexisting there. In the Mietz and Weiss engine kerosene issprayed into the cylinder near the end of the stroke by the pumpG, and vaporized by the hot cylinder head H and finally ignitedby the high temperature from compression in the heated ballF at the end. The mixture then explodes and the action de-scribed above is repeated. In small engines using gasolene, the air entering the crankcase is drawn through a carbureter in which the air is drawnthrough gasolene or is mixed with it. This charges the air withfuel and the mixture is ignited at the end of compression by a. Scale 120 lb. = lCylinder Card Scale 10 lb. = 1Crank Case Card Fig. 178.—Cards from cylinder and crank case of a two-cycle engine. spark. In large two-cycle engines the fuel gas and air arecompressed in piston compressors and admitted to the cylinderat the proper time. Fig. 178 illustrates the form of indicatorcards from the cylinder and crank case of the engine above. GOVERNING Internal combustion engines are governed in two principalways: (a) by the hit and miss system and (b) by the throttledcharge system. In the hit and miss method of governing thegovernor acts on the gas or fuel valve so that no gas is admittedwhen the speed exceeds a given limit, but as long as the limitis not exceeded the engine receives its full charge. In throttlegoverning the charge of fuel and air may be throttled or the 368 HEAT ENGINEERING fuel may be throttled alone. In the first of these less fuel
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