Internal combustion engine
The most common layouts among these engines are the V layout, and the inline layout. In the V engine, the pistons are aligned in a V shape if you look at them from the front. There can be V twin engines, with 2 pistons, V3 engines, V4 engines, V6 engines, V8 engines, V10 engine, V12 engines, V14 engines, V16 engines, V18 engine, V20 engine and V24 engines. The VR layout is the same as a V layout except the angle between the V shape is smaller making the overall drive smoother. In inline engines, the pistons are aligned in a straight line. There can be inline 1 engines, also called a singular piston engine, all the way up to a straight 14 which was mainly used in older models of cars. Flat engines are the same as inline engines but are aligned horizontally.