Different Flat & Boxer Engine Configurations Explained | FlatTwin to Flat16

A flat engine is also a horizontally opposed piston engine with cylinders on either side of a central crankshaft.

Most flat engines use a "boxer" configuration because the movement of the engine's pistons resembles the action of a boxer's fists in the horizontal plane. However, unlike the boxer's fists, which both moves in the same direction, half of the 'Boxer' engine's pistons move in the opposite direction. Boxer engines have low vibrations since they are the only common configuration with no unbalanced forces, regardless of the number of cylinders.

Flat engines have been used in aviation, motorcycle, and automobile applications. They are now less common in cars than straight engines and V engines (for engines with six or more cylinders). They are much more common in aircraft, where straight engines are a rarity, and V engines have almost vanished except in historic aircraft. And They have even replaced radial engines in many smaller installations.

The advantages of flat engines are a short length, low center of mass, and suitability for air cooling.

The most common flattwin engines are:
Flattwin engines: A flattwin engine is a twocylinder IC engine with the cylinders on opposite sides of the crankshaft, where both cylinders move inwards and outwards simultaneously.

Flat4 engines: A fourcylinder piston engine with two banks of cylinders lying on opposite sides of a common crankshaft. Most flatfour engines are designed so that each pair of opposing pistons moves inwards and outwards simultaneously. The terms "flatfour" and "boxerfour" are often used synonymously.

Flat6 engines: It is a sixcylinder piston engine with three cylinders on each side of a central crankshaft, where each pair of opposed cylinders moves inwards and outwards simultaneously.

Flat8 engines: A flateight engine is an eightcylinder piston engine with two banks of four inline cylinders, one on each side of a central crankshaft.

Flat10 engines: A flatten engine is a tencylinder piston engine with five cylinders on each side of a central crankshaft.

Flat12 engines: A flattwelve engine is a twelvecylinder piston engine with six cylinders on each side of a central crankshaft.

Flat16 engines: A flatsixteen engine is a sixteencylinder piston engine with eight cylinders on each side of a central crankshaft.

Time Stamp
00:00 Introduction to FlatEngines
01:43 Types of FlatEngines
02:01 FlatTwin Engine
04:42 FlatTwin Engine in Motorcycles
06:45 Flat4 Engine
11:00 Flat6 Engine
14:09 Flat8 Engine
16:16 Flat10 Engine
17:07 Flat12 Engine
19:55 Flat16 Engine
21:00 Wrap Up

All images used in this video are under a creative commons license.

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