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Diesel Power Review—Detroit Diesel (continued from page 23) sion of General Motors offers ad- vanced fuel economy models of its 149 Series diesel engines. The tur- bocharged and intercooled engines are said to be the most fuel-effi- cient heavy-duty diesels available in their power range. The Detroit 149 engines in 12- and 16-cylinder, V configurations are expected to show fuel economy improvements of about 3.5 percent over previous engines at the same horsepower ratings. The 12-cylin- der models are available up to 894 bhp, and the 16-cylinder versions up to 1,212 bhp. The fuel economy improvements are the result of a number of engineering develop- ments, including new turbocharg- ers, unit fuel injectors, and a new airflow system. With the new system, the power required to drive the Roots type blowers used in Detroit two-stroke cycle engines is reduced signifi- cantly as the engine reaches oper- ating speeds. As that happens, the increased airflow from the turbo- chargers takes over the function of providing the intake air needed to maintain combustion and scaveng- ing in the cylinders. A special valve takes the load off the blower by equalizing the pressure on both sides of the rotors, reducing blower horsepower. The new turbocharg- ers and unit fuel injectors have been carefully tailored to match the needs of the new system for optimum fuel efficiency. Detroit Diesel 149 Series en- gines have been popular with the commercial fishing industry for many years. ELECTRO-MOTIVE Circle 19 on Reader Service Card Rating increases of 10 percent, resulting from technological im- provements, have been announced by the Electro-Motive Division of General Motors. The leading sup- plier of diesel engines to the do- mestic marine market says the 645FB engine provides a five per- cent improvement in fuel effi- ciency over its 645EB series of engines. "EMD engines have been a fa- vorite of the marine industry since they were first introduced in 1937. Their high reliability, ease of maintenance, and the continuing improvements in fuel efficiency have made them the standard of the industry," said G.C. Mulick, EMD manager power products. The product advances incorpo- rated into the 645 series enables EMD to offer ratings for propul- sion engines ranging from 1,050 bhp at 900 rpm for the Roots blower engine model 8-645E6 to 4,000 bhp at 900 rpm for the turbocharged model 20-645F7B engine. In the EMD marine generator sets, power output ranges from 570 kw, 50 Hz at 750 rpm in the Roots blower engine model 8-645E6 to 2,865 kw, 60 Hz at 900 rpm for the turbocharged 20-645F7B engine. Electro-Motive is currently in the midst of a 10-year, $1.3-billion product and facilities improve- ment program. This program has seen the completion of EMD's blended fuels facility; it will see the addition of 63 computer- controlled machines to accompany the more than 150 already in place. The planned investment also includes the addition of robotics for such applications as material handling, arc welding, and deburring. GARDNER Circle 20 on Reader Service Card British diesel engine manufac- turer L. Gardner and Sons Ltd., represented in the U.S. by Waller Marine of Houston, is now concen- trating on the North American marine market with the company's line of naturally aspirated and turbocharged diesels that have a (continued on page 26) ohnson DURAMAX Sleeve and Flanged Bearings • Molded Rubber—Securely Bonded to Naval Brass Shell. • They Meet Military Specification MIL-B-17901A (Ships) Class II Full-Molded Type. i Easy to Install — Easy to Replace • Less Shaft Vibration — Quieter Running — Non Polluting • Full Range Of Sizes From 3/4 Through 6 Inches In Sleeve Bearings — And From 2 Inches Through 15 Inches In Flanged Bearings. WRITE FOR BEARING CATALOG DURAMAX® MARINE division of The Johnson Rubber Company ®T. M. Reg. Printed in USA NAVAL TOUGH SHAFT WATER BRASS NITRItE GROOVE SHELL RUBBER Middlefield, Ohio 44062 U S A Area Code 216 632-1611 Telex: 21-2564 JRCM UR Cable: "DURAMAX Dependable Products For Ships Throughout The World 6-2010-283 Circle 308 on Reader Service Card FERNSTRUM R. W. FERNSTRUM S. COMPANY MENOMINEE, MICHIGAN, U.S.A. 49858 Phone (906) 863-5553 • Tele* 26 3493 • Answer Back FERNSTRUM MNOM R. W. FERNSTRUM & CO., EXPORT DEPT. MENOMINEE, MICHIGAN, U.S.A. 49858 Phone 906! 863 5553 • Tele* 26-3493 • Answer Back FERNSTRUM MNOM 24 Circle 265 on Reader Service Card Maritime Reporter/Engineering News
