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).
Page from a publication detailing various marine diesel and petrol engines from multiple manufacturers.
| Identifier | ExFiles\Box 133\3\ scan0125 | |
| Date | 1st January 1940 guessed | |
| The Mack Mariner Diesel, new this year, is a 6-cylinder engine shown in two models, one of 100 hp. at 1800 r.p.m., the other, of 120 hp. Sterling Engines The Sterling Engine Co., of Buffalo, N. Y., returns to the Show in Space W on the mezzanine floor with the improved models of its line of high efficiency engines which have found favor for many years. Among these is the Sterling Petrel, with a rating of 225 hp., which, when recently tested by the Royal Canadian Mounted Police for their patrol boats, developed 238 b. hp. It is of 5¼″ bore and 6″ stroke, a 6-cylinder engine of the L-head type, with dual carburetors, counterweighted crankshaft, and light valves. Counterweighting of the crankshaft has been standard practice since 1914. More than 300,000 horse power in Sterling Petrel engines has been built, many of the units being employed for driving pumps and generators for semi-continuous service, and the marine engine of the 1940 line receives the benefit of the development and improvement that have resulted from arduous service. The Petrel is also built with an integral Morse reduction gear of 2:1 ratio. The engine is capable of delivering 190 hp. at 1800 r.p.m. and the combination of the Morse gear reduces the propeller speed to 900 r.p.m. The average boat of 55 to 65 feet in length employs pairs of these engines with 28″ diameter and 30″ pitch propellers, and makes approximately 20 m.p.h. with excellent economy. Also shown is the Sterling Dolphin 6-cylinder engine, rated at 300 hp. at 2000 r.p.m. and used in the new 38-foot United States Coast Guard boats. A number of the older boats with the Dolphin light-weight dual-valve-in-head engines have been in service for about fifteen years, with a fine record for dependability and low maintenance cost. The valves, weighing only 8 ounces each, are easy on their seats, cooling of fuel on their boats, is a 15 kw. generator set, powered with a model 4-DTG-212 Diesel engine. Altogether, Buda is exhibiting five Diesels, one Diesel generator set, three gasoline engines, three small “Air Jacketed” inboard engines and, in addition, the Buda Hydraulic Diesel Nozzle Tester. Mack Mariner Diesels A newcomer at the Show this year is the Mack Manufacturing Corporation, well-known makers of trucks, buses and fire apparatus. This company is showing the two new marine diesel engines introduced only three months ago. Type Y is designed for use in light to medium displacement craft and Type W for heavy yachts and work boats. Both engines have six cylinders with 4⅜″ bore by 5¾″ stroke which gives them a piston displacement of 519 cubic inches. Type W develops 100 hp. at 1800 r.p.m. with a compression ratio of 14.57 to 1, which works out at 480 pounds per square inch. Type Y is of similar design but with certain changes which raise the mean effective pressure to 105 pounds, resulting in the development of 120 hp. at 1800 r.p.m. Other details in which the two engines differ are the clutch and reverse gear. Type Y uses a Joe’s clutch and reverse gear, while Type W has a Twin Disc. Various reduction gear ratios are available with each engine. The Mack Mariners have fresh water cooling systems employing Harrison heat exchangers. Circulation is provided by a dual shaft raw water pump and a centrifugal type of fresh water pump. They employ the Lanova system of controlled combustion which produces a smooth, shockless flow of power, insuring quiet performance. Injection is at moderate pressure by means of a Bosch multiple unit pump mounted on the side of the engine with a separate fuel pipe leading to each injection nozzle. Full pressure lubrication is provided by a submerged gear pump. An interesting and informative adjunct to the engines themselves, is a complete panel fully illustrating the principle of the Lanova combustion system. There is also displayed a cut-away model of a Type Y engine, showing in detail the design, mechanical construction and general workmanship of the Mack marine Diesels. The newest Buda-Lanova 6-DTM-317 marine Diesel engine is a 6-cylinder model which is rated at 90 hp. maximum | ||