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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 Excerpt: ... are built in all sizes, but the last named type is used only for marine and traction work. They are made in both the two and four stroke cycle kinds, the two cycle engines being largely used because they do away with the valves in the cylinder and this gets rid of the camshaft, gears, and other accessories that are always found on four cycle engines. Again, mixing valves are used on oil engines very similar to those on stationary gasoline engines, and this makes for simplicity as against the more complicated carburetors that are a part of all mobile gasoline engines. Further, many oil engines, especially the larger sizes, are of the Diesel and semi-Diesel types, that is, the fuel charge is fired either by the heat developed by compression of air alone or by the heat of the explosion which keeps a hot ball, or bonnet, at a temperature high enough to fire the fuel charge. Either of these simple expedients gets rid of a lot of ignition trouble. Finally a spray of water is sometimes injected into the cylinders at the same time that they take in air, and the valve for the water so used will be considered presently. Oil Fuel Feed System--The Oil Supply Tank.--In very small engines the fuel tank often sets close to the cylinder and the oil is drawn into the latter through a nozzle by the suction stroke of the piston. In some engines, up to 20 horsepower, the fuel tank is placed in the base and is large enough to hold a sufficient quantity of oil to run the engine for a stretch of 24 hours, and, where the rules of the Fire Underwriters will permit, there is no danger in using an oil supply of this kind. For engines of more than 20 horsepower it is better in every way to have a large storage tank outside of the engine and sunk in the ground. In either case the oil ...

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