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This four-cylinder engine from 1923 was a conversion of a German gasoline engine to the Lang-Acro system—a precursor to the Lanova developed later. The injection pump developed 650 psi and sprayed into a relatively low-pressure cylinder of about 200 psi (about 12:1 CR). This engine was brought to the United States by Lang and Wielich in one of the irst foundation steps of introducing air cell technology here. This, along with a one-cylinder test engine, got Bosch interested in the Lang-Acro technology.
The Lang-Acro combustion chamber featured an air cell in the piston crown. Mercedes-Benz, Perkins, MAN, Cummins and Kreutzer, among others, used an air chamber system of some type, although they were just different enough to escape patent violation charges. After Robert Bosch hired Lang and bought Acro, the design was modiied, and the Acro-Bosch system was the result. Truck maker A.E.C. of England licensed the Bosch-Acro and produced a number of engines using it. However, this company moved on to Ricardo-designed engines because the Bosch-Acro licensing was too costly.
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Diesel World July 2019, Look Inside : The New 2020 Silverado, How to build your own Power Stroke, Common Rail vs. Mechanical Injection, And More....