The H engine is a slim internal combustion engine with cylinders forming the letter “H,” often used in locomotives and propeller-driven aircraft. Some automobile manufacturers also use the term “H engine” to designate inline four or six-cylinder engines, but these have no design relationship to the H-shaped engine. The most notable use of the H engine was in propeller-driven aircraft in the 1930s and 1940s.
The H engine is a type of internal combustion engine oriented so that its cylinders appear to form the letter “H.” The design of this engine makes it slim and suitable for long, compact spaces where a large number of cylinders can be deployed to produce a lot of pulling power. It is often used in locomotives and propeller-driven aircraft. The term “H engine” can also refer to certain automobile engines with an “H” designation, although these have no design relationship to the H-shaped engine.
Engines often take their rating from the orientation of their cylinders. A V-8 engine, for example, has two rows of four cylinders in a “V” shape. In the H engine, each branch of cylinders has a separate crankshaft that meshes with the crankshaft of the other half of the engine, forming the “H” shape. Also called the H-block, the true “H” shape is generally considered unsuitable for automotive use due to its shape and the fact that it has a low torque ratio created by having two crankshafts, making initial acceleration difficult. slow.
One tractor manufacturer, Farmall, as well as several automobile manufacturers, including Honda, Subaru, and Saab, have created engines that they call an H engine. All of these manufacturers use the “H” to designate inline four-cylinder engines, and sometimes , six cylinders. In-line means all the cylinders sit in a straight line, as opposed to a true H where the cylinders sit in two rows. In this case, the engines are designated not by shape, but by alphabetic letters. For Honda, the H followed the F and was replaced by the K. Saab first issued the H as a replacement for the B engine in 1981.
The best known H car engines were those produced by Honda, produced between 1993 and 2001. The first of this type of engine, designed as the H22, was used in Prelude models and some Accord models. The Honda “H” series was considered a high performance engine and was also used in Honda race cars. Without modifications, the base H22 created 190 to 220 horsepower and 156 to 163 ft-lbs of torque with a top rpm of 7,500.
Historically, the most notable use of the H-shaped engine was in the 1930s and 1940s in propeller-driven aircraft, as it was considered a compact and streamlined engine. The most famous use of the H engine in aircraft was in British World War II fighters. The Napier Saber, a 24-cylinder H engine producing 3,500rpm, was used in Typhoon and Tempest fighter jets. The 24-cylinder Rolls-Royce Eagle 22, producing 3,200 rpm, was used in the Wyvern torpedo/fighter bomber.
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