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Aviation History
1918
1918 - 0621.PDF
JUNE 6, 1918. THE 240 H.P. (8-CYLINDER) MERCEDES. (Continued from page 593.) Carburettors and Induction System. According to a report on the aeroplane fronTwhich Two standard 2-jet 160 h.p. Mercedes Carburettors this engine was taken, the main petrol tank (forming are fitted as shown in the photograph of the engine the pilot's seat) had a capacity of 50 gallons, and the (Fig. 1). The two throttles are, of course, inter- connected. The left hand carburettor feeds cylinders 1, 2, 7, and 8, whilst the right hand carburettor feeds the four central cylinders. The induction pipes are of copper, lagged with asbestos cord and bound with Fig. 15 Arrangement of half compression^ gear, camshaft drive, and details of air pump. adhesive tape. The internal diameter of the induction pipe is 54 mm., and the smallest diameter oi the choke is 24 mm. The air intake to the carburettors is through the large passages cast in the top half of the crank chamber, which lead to the central portion below the false bottom of the base chamber between the front and rear oil sumps, as in the 160 h.p. engines. Details of the carburettor are shown in the sectional drawing, (Fig. 17), and the general arrangement of the water piping to the water jackets of the carburettors in the photograph (Fig. 16). machine carried an auxiliary tank of 6| gallons capacity, situated between the pilot's and observer's seat. .. . .1 ..— . Crank-Chamber. Apart from'the additional length'and the'extension of the crankcase casting for the reduction gear, the crankcase,^ in^itsf general construction, follows the M iiv .IffT 2 0 MM t>l I,W RDXMN8 iMUItMtKT flU>T J«1', .0 MM 17.—Semi-diagrammatic section through oneof the carburettors. design of the 160 h.p. Mercedes, the bottom half being constructed with a false bottom, below which are the two oil sumps, one at the front and one at the rear end of the base chamber, as shown in the sectional arrangement of the engine (Fig. 3). Three breathers are provided in the top half of the crank-chamber on the exhaust side. The central breather is connected by a large diameter pipe to the air chamber, between the two oil sumps in the bottom half. This air chamber (as shown on Fig. 2) is open on the exhaust side, and communicates with the air intake passages to the two carburettors. Fig. 18.—Bottom half of crank-chamber, showing thejtwo^air intake passages leading from the centralair chamber between the front and rear sumps to the carburettors. 619
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