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.