In automotive engineering, a longitudinal engine is an internal combustion engine in which the crankshaft is oriented along the long axis of the vehicle, from front to back.
Longitudinal engine in a three-wheeler chassis
Longitudinal inline-six cylinder engine in a Henderson De Luxe Supersix of 1926
The straight-five engine is a piston engine with five cylinders mounted in a straight line along the crankshaft.
MAN B&W 5S50MC 1,865 litre marine diesel engine
An Audi 2.3 NG engine, mounted longitudinally
A Volvo B5244S engine, mounted transversely