From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
New supercharged diesel engines and marine electric plants from various manufacturers.
| Identifier | ExFiles\Box 133\3\ scan0127 | |
| Date | 1st January 1940 guessed | |
| Above, left, the single cylinder Model AKM air-cooled engine, one of the seven models displayed by the Wisconsin Motor Corporation, is rated 4.2 hp. It is fitted with Joe's gear. Right, the 2:1 reverse-reduction gear built by Wisconsin Left, the Lauson LF 818, a 4-cycle engine of 3.7 hp., equipped with Lauson clutch and reverse gear and 2:1 ratio gear reduction are larger one-cylinder motors, the former developing 4.7 hp. and the latter 8 hp. The showing is completed with a compact 16 hp. 4-cylinder air-cooled engine fitted with Joe's reverse gear. Cummins Has New Supercharged Diesels An outstanding feature of the display of the Cummins Engine Co., of Columbus, Ind., is a new light-weight 125 hp. supercharged Diesel which supplements the 200 hp. supercharged unit that was a sensation at last year's Show. The new engine, numbered AMRS-600, is of 6 cylinders, with 4" bore and 5" stroke, and develops its maximum horse power at 2200 r.p.m. As a result of research in the present day campaign to reduce the ratio between weight and power, the new Cummins weighs only 10 pounds per horse power, including the weight of standard equipment such as fuel pump, electric starter, etc. Other engines shown by Cummins are three Diesels which are widely used in pleasure craft, work boats and fishing boats: the 6-cylinder 100 hp. Model AMR-600, the 4-cylinder 66 hp. AMR-400, and the 15-kw. marine generating set, Model AGD-401. A word of explanation as to the method of supercharging a Cummins Diesel will be of interest, it first being understood that the full Diesel type of engine depends for combustion only on fuel and air. The amount of air in each cylinder on each power stroke determines the amount of fuel which can be burned efficiently on that stroke. Consequently, if more air can be introduced to the cylinder, the burning of more fuel or the more efficient burning of a given fuel charge will be effected. The supercharging unit itself is only a small belt-driven compressor or blower which creates a pressure behind the air entering the Diesel through the intake manifold. The supercharged Cummins has seven to eight pounds of air pressure in each cylinder at the start of the compression stroke, whereas unsupercharged high speed engines, gasoline or Diesel, are likely to have negative pressure — that is, a slight vacuum. The Cummins Company has found no need in developing its supercharged engines for larger or heavier bearings, rods or crankshaft, for the reason that, through slightly reducing compression ratios, the peak pressure attained in each cylinder is not much greater than in the standard engines. The exclusive Cummins injector injects the fuel oil into the cylinders by means of a mechanically operated plunger which makes for progressive injection of the fuel during the power stroke, thus scaling down the peak pressure and inducing smooth running, high torque and a more efficient use of fuel. A low pressure pump accurately meters and delivers the fuel to the cylinder where it is gasified and progressively injected. As an attention-attractor, the Cummins Company is showing a handsome 20 by 10-foot illuminated display unit which gives the operation of the Cummins fuel system, various fuel system and engine parts, and several Cummins Diesel-powered boats. U.S. Has New Electric Plant The United States Motors Corp., of Oshkosh, Wis., is showing its new lightweight, compact marine Diesel-electric plant which derives its power from a 2-cylinder engine with pistons, valves, bearings and all such items interchangeable with its 4- and 6-cylinder engines. The unit is available at 900 r.p.m. for 3, 5, and 7½ kw.; and at 1200 r.p.m. for 5, 7½, and 10 kw. The 4- and 6-cylinder Diesel units that have proved so popular in the past are continued in the line One of the Cummins Diesel engines at the Show is this Model HRMS-600. It is a supercharged engine developing 200 hp. at 1800 r.p.m. It weighs but 10 pounds to the horse power | ||