Noun
in-line engine (plural in-line engines)
(automotive) An engine that has all cylinders in one line or row.
The straight-eight is an eight-cylinder in-line engine.
Griehl 2001, p. 47. These problems were to be resolved by installing the Daimler-Benz DB 600 engine, but delays in development forced the installation of the Jumo 210 Da in-line engine. Source: Internet
The Jumo 211D in-line engine was installed, replacing the R-1s Jumo 211A. Source: Internet