H engine
Encyclopedia : H : HE : HEN : H engine
- For the Saab "H" engine (a straight-4) see Saab H engine
An H engine can be viewed as two flat engines, one atop the other. The "two engines" each have their own crankshaft, which are then geared together at one end for power-take-off. This leads to a worse power-to-weight ratio than simpler configurations with only one shaft. The only obvious advantage of the H configuration is to allow the building of reasonably short engines with more than 12 cylinders, their compact size being useful as aircraft engines where their small size allows for better aerodynamics - see Lycoming.
The H configuration is therefore very uncommon. Known examples are:
- The British Racing Motors H-16 Formula One engine, which was a major failure. This engine was powerful but heavy and unreliable, had low torque and a high center of gravity. Jackie Stewart is believed to have said "This piece of metal is better used as a ship's anchor than as a power plant". Despite its poor reputation Jim Clark managed to win the 1966 US Grand Prix with a Lotus 43 powered by this engine.
- The Lycoming H 2470 hyper engine, that did not go into production.
- The Napier Rapier, Dagger and Sabre airplane engines. Unlike the BRM and the Lycoming, the Sabre eventually matured into a superb design.
- The Brough Superior 1000cc Golden Dream motorcycle, first shown in 1938. This was an H-4 design but sadly only a few units were produced in early 1939.
| Piston engine configurations | |
|---|---|
| Straight | Single, 2, 3, 4, 5, 6, 8, 9, 10, 12, 14 |
| V | 2, 4, 6, 8, 10, 12, 16, 20, 24 |
| Flat | 2, 4, 6, 8, 10, 12, 16 |
| W | 8, 12, 16, 18 |
| Other inline | H, VR, Opposed, U (Square), X |
| Other | Radial, Rotary, Pistonless (Wankel) |
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