Diesel engines for land and marine work . ith low speed engines. In Figs. 51 to 56 inclusive are given drawings of highspeed engines built by various firms, from which it will beseen that there is not any very marked difference betweenthe several types. In each case they are totally enclosedand provided throughout with forced lubrication, which isof course an essential feature in motors running at rela-tively high speed. It should, however, be pointed out anengine rotating at say 350 revolutions per minute does notnecessarily imply that the piston speed is correspondinglyin excess of that in t
Diesel engines for land and marine work . ith low speed engines. In Figs. 51 to 56 inclusive are given drawings of highspeed engines built by various firms, from which it will beseen that there is not any very marked difference betweenthe several types. In each case they are totally enclosedand provided throughout with forced lubrication, which isof course an essential feature in motors running at rela-tively high speed. It should, however, be pointed out anengine rotating at say 350 revolutions per minute does notnecessarily imply that the piston speed is correspondinglyin excess of that in the slow running type, for the differenceis in fact not usually very great. It follows from this thata larger number of cylinders is usually adopted for the samepower in a high speed engine, whilst the ratio of stroke tobore is much diminished, being usually in the neighbour-hood of unity or slightly over. This does not give themaximum efficiency, but in cases where it is desirable toemploy the high speed engine its advantages are usually. Fig. 48.—End Section of (JOO Four-Cycle 96 DIESEL ENGINES FOR LAND AND MARINE WORK such as to counterbalance any slight increase in fuel con-sumption. The large high speed type of engine manufactured by theNederlandsche Fabriek offers some important points ofdifference from that of the usual construction. Fig. 50shows a front section of a 600 engine built by thisfirm, to run at 215 revolutions per minute. It is of theusual four-stroke type, with four cylinders, the two innerhaving the cranks set at 180° with the outer pair. Asingle air pump is employed, mounted on the end of thebed-plate, being of the vertical two stage type, and drivendirect ofr the crank shaft. A trunk piston is not used,but there is a crosshead and a short connecting rod, andthough the length of the piston is diminished, since it nolonger has to be of the usual bearing surface, the engine isnecessarily somewhat higher than the ordinary trunk pisto
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