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Double Acting Engines of Large Power | ET € = au SR pa 1 aa e Cocke ert ar =} | ope a it area siel al Es) i i je Miri foie eee eee tN HE main motive power of the Gripsholm consists of two six- cylinder double acting Burmeister & Wain four-stroke cycle diesel engines, each developing 6750 shaft horsepower or 8150 indi- cated horsepower at 125 revolutions per minute. All auxiliaries have been eliminated from the main engines including compressors. The diameter of the cylinders is 33 inches and the piston stroke is 59 inches. Each cylinder gives 1360 indicated horsepower. These engines embody the usual practice of the builders but have fuel, air, exhaust and starting valves for both top and bottom of cylinders. To prevent the maximum temperature of combustion from reach- ing the piston rod it is, in the first place protected by a cast steel sleeve, and there is a special combustion chamber to one side of the cylinder and connected with it by a restricted passage.. The accompanying sectional line drawing shows the principal features of construction. Layouts of main and auxiliary engine rooms are also shown. Directly forward of the main engine room in which are located the two propelling engines, is the auxiliary engine room with no less than six diesel engines. Of these, three are directly connected to air compressors for furnishing injection and maneuvering air for the main engine. Each engine is of 4 cylin- ders and 750 brake horsepower at 170 revolutions per minute. Three engines, each of 3 cylinder and 500 brake horsepower at 200 revolutions per minute are directly connected to dynamos of 330 kilowatts for the ship’s electric power. Lubricating oil and cooling water pumps needed for the main engines are in the main engine room. Other auxiliaries are in the auxiliary engine room. M/S,CRIPSHOLM: EO} AON =3 Lt Fuel Valve (Top mn ait Y AL Lore Combust? Space tor Underside of Pist™ : lal Section through the Burmeister & Wain 4-stroke Cycle Double-Acting Diesel Engine.