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Show j new on, enghte. .y J y as" I I A new oil engine is the recent and combustion motor and Its adaptation to the use of crude oils or oils of a specific gravity that precludes their Use in motors of the ordinary -type. Like all engines suitable for crude oil the latest innovation has pro vie ton for the injection of water into the cylinder before compression. This has the ef-j feet of allowing a much higher com- j presslon without prelgnltlon than is ordinarily possible, and it has other important effects. The builders say that the water vapor prevents the decomposition de-composition of the petroleum to a great extent enabling the engine to run long periods with crude oils without leaving an excess of deposit on the vaporiser's walls. - It is not easy to understand Why water should nrevent decomDOsi- i tion of the petroleum. The engine works on the four stroke cycle and uses the heavy black petroleum oils and the semi-refined or intermediates, as well as the ordinary refined lamp oil. There Is a cylinder 14 Inches in diameter, giving giv-ing 47 brake horse power with refined oils and 38 brake horse power .with crude oils. On ths suction stroke of the piston air is drawn mto the cylinder cylin-der through the main air valve, and oil Is pumped through the oil sprayer Into the vaporiser, which receives a further supply of air through a shifting valve. At the same time water is . pumped through the water sprayer and enters the vaporiser. This charge Is then compressed, .and, as the crank of the engine passes the Inner dear center. Is Jgnlted by the hot igniting tube, giving the working stroke. The exhaust valve then opens to allow the burnt charge to escape, completing the cycle of operations. The ignitions are continuous continu-ous on all loads, and the Ignition tube Is therefore retained at the required temperature without the aid of a lamp except when starting the engine. The speed of the machine is governed by varying the amount of water and oil Injected, so that on heavy loads full charges of oil and water are delivered, while on llzht loads small charges are given. Chicago Tribune. |
