W, X, U, H, Horizontal K, Delta and opposed piston engines all have different layouts. In the W engine, the pistons are aligned in a W shape if looked at from the front. The Bugatti Chiron, one of the fastest cars in the world, features a W engine. The pistons in a X are aligned to look like an X from the front. In the U engine, there a 2 inline engine with separate crankshafts and a shared output shaft. When looked at from the front of the engine block, it resembles a U shape. H engines are U engines except there are 2 more inline engines attached to the bottom of the existing inline engines from the U engine. The H and the U layout can be configured vertically or horizontally. In delta engines, the pistons are aligned in a triangle shape. There are 2 pistons per cylinder/combustion chamber, and therefore the minimum amount of pistons in a delta engine is 6. Horizontal K engines have 2 flat pistons facing opposite each other at the bottom and a V engine above them, making them look like a horizontal K. The Opposed piston engines also have 2 pistons per cylinder. They can be aligned vertically or horizontally. When there are only 2 pistons in the engine, they can be called boxer engine.
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