Recent Suggestions in Diesel-Engine Construction Page: 2 of 32
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NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS.
TECHNICAL MEMORANDUM NO. 425.
RECENT SUGGESTIONS IN DIESEL-ENGINE CONSTRUCTION.*
By F. Ernst Bielefeld.
The multistage injection-air compressor of the Diesel en-
gine is a special auxiliary mechanism which considerably in-
creases the original cost of the engine, the cost of operation
7 to 12% by the consumption of energy,. and the weight of the
power plant from 10 to 33%. Moreover, it causes disturbances
in operation which must be taken into account. Naturally it must
continue to be used until some other way is found for the satis-
factory combustion of the fuel in high-pressure engines. Con-
siderable progress has been made recently in the construction
of "airless" Diesel engines (i.e., with direct mechanical injec-
tion, without the use of compressed air). There are already
several apparently reliable Diesel engines without multistage
air compressors. These were made possible by the invention of
high-pressure fuel-injection pumps, which function with soft-
metal packing, without troublesome stuffing boxes. In the new
pumps, the pistons and cylinders are hardened and polished.
Moreover, reliable valves and fine injection nozzles have been
invented. Other important improvements are the rigidity of all
the pump compartments and injection passages, the complete elim-
ination of air from the fuel and the prevention of the formation
*"Neueste Bestrebungen im Bau von Dieselmotoren." From "Schiff-
bau," June 2, June 16, and July ,7, 1926.
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Bielefeld, F. Ernst. Recent Suggestions in Diesel-Engine Construction, report, August 1927; (digital.library.unt.edu/ark:/67531/metadc277535/m1/2/: accessed January 23, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.