Engineering Wonders of the World
Volume III

36 ENGINEERING WONDERS OF THE WORLD. the use of long induction pipes, and saves a few pounds of weight. Engines of the eight-cylinder V class in- clude that manufactured by the Wolseley Tool Fig. 8.—THE WOLSELEY EIGHT-CYLINDER 60 HORSE-POWER ENGINE. WEIGHT, 340 LBS. In this type the propeller is driven off the cam-shaft at half-engine speed. and Motor Car Company (Figs. 8 and 9). This firm’s engine has cylinders of 3j-inch bore and 5-inch stroke. All the The Wolseley vajves are operated mechanic- ally by a central cam-shaft and rockers. The cylinders, of close-grained cast- iron, are cast in pairs, and each pair is sur- rounded by a water-jacket shaped out of plan- ished sheet aluminium. Water circulation through the jackets is on the thermo-syphon principle, which does not require a pump. A float feed and spray type carburettor is mounted in the centre of the engine directly over the cam-shaft—an arrangement which allows of short induction pipes, and ensures an equal distribution of explosive mixture to the cylinders. The weight of the engine, com- plete with fly-wheel, ignition, water-pipes, and exhaust pipes, is 340 lbs. ; the power developed at 1,350 revolutions per minute is 50 B.H.P. ; and the maximum obtainable 60 B.H.P. This gives an average of about 6 lbs. per horse- power. For aeroplane work the engine may be arranged to drive the propellers direct from the crank-shaft, or, by means of gearing, at cam-shaft speed. For large propellers the second method is preferable. The Fiat, Jap, Pipe, and Renault are all air-cooled, but differ considerably in detail. The Fiat (Fig. 10) is enclosed in a circular case, through which a strong current of air is driven by a fan. The combustion heads are detachable for cleaning the Other Eight- Cylinder V Engines. inside of the cylinders. The engine develops about 40 horse-power, and weighs 135 lbs. Fig. 9.—WOLSELEY ENGINE, DIRECT DRIVE TYPE. END VIEW.