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Aviation History
1917
1917 - 1309.PDF
r DECEMBER 13, 1917. THE 23O H.P. BENZ AERO ENGINE. Continued from page 1278.) Crankcase.—The details of the crankcase are clearly shown in the photographic views of the top and bottom halves (Figs. 13 and 14). The method of cooling the interior of the crank chamber and sump indicates the fact that this matter has received most careful consideration in design. In the top half of the crankcase six of the seven main side of the engine. A corresponding but reversed cowl is fitted on the exhaust side. Breathers are also fitted into the top half of the crank chamber. The simple type of wire spring clip fitted to the breathers should be noted. Carburation system.—Two separate carburettors are fitted, each feeding three cylinders. These are Fig. 12.—The crankshaft and propeller boss. bearing housings are cast so that the webs form air passages transversely across the engine. Two of these passages form the air intake passages for the two carburettors—similarly to those of the 160 h.p. Benz engines—as already stated. A section through one of these passages is shown in Fig. 16. The bottom half of the crank chamber is extended to form an oil sump and is of unusual design. The lower portion is cooled by 18 30-mm. aluminium tubes fixed transversely across the base chamber, the air being scooped into the cooling tubes by a large sheet aluminium louvred cowl on the induction in1mmmmmmm ft wmmmT • '"til attached by flanges to the side of the top half of the crank chamber. Referring to the sectional drawing of the car- burettor (Fig. 16), it will be seen that the pilot jet is formed by an extension of the brass tube into which the main jet is screwed. This combined jet is screwed obliquely into the bottom of the float chamber casting and not into the body of the carburettor. The float chamber is attached to the body of the carburettor by two bolts, and the throttle is of the horizontal barrel type. As already mentioned, the main air intake passages are cast in the crank chamber between the webs of the main bearings, air entering each carburettor through two ports cut in the end of the throttle, and also through the air passage at the base of the car- burettor below the jets. At full throttle most of the air is taken through the Fig. 13.—View of top half of crank case. Fig. 14.—-Bottom half of crank case. Fig. 15.—Side view of bottom half of crank case,showing air-cooling tubes. . 1309
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