A straight-12 engine or inline-12 engine is a twelve-cylinder internal combustion engine with all twelve cylinders mounted in a straight line along the crankcase. A straight-12 is a very long engine, and therefore straight-12 engines are not common in automobiles, but it has been used for large military trucks. Also some Russian firms built straight-12s for use in boats in the 1960s and 1970s.
The Wärtsilä-Sulzer RTA96-C, the largest reciprocating engine in the world As of 2006, is a straight-12. It is used on container ships.
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| Piston engine configurations | |
|---|---|
| Type | Bourke • Controlled combustion • Deltic •Orbital • Piston • Pistonless (Wankel) • Radial • Rotary • Single • Split cycle • Stelzer • Tschudi |
| Inline types | H · U · Square four · VR · Opposed · X |
| Stroke cycles | Two-stroke cycle • Four-stroke cycle • Six-stroke cycle |
| Straight | Single · 2 · 3 · 4 · 5 · 6 · 8 · 10 · 12 · 14 |
| Flat | 2 · 4 · 6 · 8 · 10 · 12 · 16 |
| V | 4 · 5 · 6 · 8 · 10 · 12 · 16 · 20 · 24 |
| W | 8 · 12 · 16 · 18 |
| Valves | Cylinder head porting • Corliss • Slide • Manifold • Multi • Piston • Poppet • Sleeve • Rotary valve • Variable valve timing • Camless |
| Mechanisms | Cam • Connecting rod • Crank • Crank substitute • Crankshaft • Scotch Yoke • Swashplate • Rhombic drive |
| Linkages | Evans • Peaucellier–Lipkin • Sector straight-line • Watt's (parallel) |
| Other | Hemi • Recuperator • Turbo-compounding |
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