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
A transverse engine is an engine mounted in a vehicle so that the engine's crankshaft axis is perpendicular to the direction of travel. Many modern front-wheel drive vehicles use this engine mounting configuration. Most rear-wheel drive vehicles use a longitudinal engine configuration, where the engine's crankshaft axis is parallel with the direction of travel, except for some rear-mid engine vehicles, which use a transverse engine and transaxle mounted in the rear instead of the front. Despite typically being used in light vehicles, it is not restricted to such designs and has also been used on armoured fighting vehicles to save interior space.
Transversely mounted engine in Toyota Corolla E80
Transversely mounted engine in Mini Cooper
The engine in this Moto Guzzi motorcycle is described as "transverse" despite the crankshaft being in line with the frame.