A multi-cylinder engine is an reciprocating internal combustion engine with multiple cylinders. The cylinders and the crankshaft which drives the pistons can be configured in a wide variety of ways. Multi-cylinder engines offer a number of advantages over single-cylinder engines, chiefly with their ability to neutralize imbalances by having corresponding mechanisms moving in opposing directions during the operation of the engine.
Configurations of two-cylinder engines include:
- Straight-twin engine, with two cylinders in parallel sharing a crankshaft.
- V-twin engine, two cylinders sharing a crankshaft at an angle.
- Flat-twin engine, having both cylinders on the same crankshaft at 180° to each other.
- U engine with two cylinders with separate crankshafts.
Configurations of three-cylinder engines include:
- Straight-three engine, also called the inline-triple engine, the most typical three-cylinder internal combustion engine.
- V3 engine, seen on some two-stroke racing motorcycles.
- W engine with three cylinders.
- Anzani 3-cylinder fan engines, W and radial three-cylinder engines of 1905 to 1915.
- three cylinder turbocharged engine inline 3 with turbocharged
Configurations of four-cylinder engines include:
Configurations of five-cylinder engines include:
Configurations of six-cylinder engines include:
- V6 engine, a V engine with six cylinders.
- Straight-six engine, an engine with six cylinders aligned in a single row.
- Flat-six engine with two banks of three cylinders 180° apart.
Configurations of eight-cylinder engines include:
Configurations of ten-cylinder engines include:
Configurations of twelve-cylinder engines include:
- Straight-12 engine, a straight engine with twelve cylinders
- V12 engine, a V engine with twelve cylinders
- Flat-twelve engine, a flat engine with twelve cylinders
- W12 engine, a W engine with twelve cylinders
- Victor Albert Walter Hillier, Peter Coombes, Hillier's Fundamentals of Motor Vehicle Technology, Book 1 (2004), p. 47.