H Engine

Information about H Engine

For the Saab "H" engine (a straight-4), see .

For the EMD "H-Engine", see .

The BRM H16 Formula One engine in its final, 64-valve incarnation.

An H engine (or H-block) is an engine configuration in which the cylinders are aligned so that if viewed from the front appear to be in a vertical or horizontal letter H.

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 U engine is a similar concept, except that it uses two straight engines.

Examples

The H configuration is very uncommon. Known examples are:

Road vehicles

A BRM H16 engine, mounted in the back of a BRM P83 Formula One car.

The British Racing Motors H-16 Formula One engine; this was a major failure. The engine was powerful, but the design was hampered not only by its low torque and a high center of gravity but also was heavy, unreliable and very complex, with gear-driven twin overhead cams for each of four cylinder heads, two gear-coupled crankshafts, and mechanical fuel injection. 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. http://members.madasafish.com/~d_hodgkinson/brm-e-H16.htm
The Brough Superior 1000cc Golden Dream motorcycle, first shown in 1938. This was an H-4 design but only a few units were produced in early 1939.

Aircraft engines

The Lycoming H 2470 hyper engine, that did not go into production.
Napier & Son
Rapier H-16
Dagger H-24
Sabre H-24, 36.7 litres 3,500 hp
Rolls-Royce Eagle 22 H-24 46.2 litres, 3,200 hp

Unlike the BRM and the Lycoming and the Eagle, the Sabre eventually matured into a superb design.

Other uses of H term

Subaru produces water-cooled flat-4 and flat-6 "Horizontal" engines that are marketed as H-4 and H-6, despite the fact that their configuration has nothing to do with a real H engine.

Piston engine configurations • • [ e]
Straight	Single, 2, 3, 4, 5, 6, 8, 9, 10, 12, 14
Flat	2, 4, 6, 8, 10, 12, 16
V	2, 4, 5, 6, 8, 10, 12, 16, 20, 24
W	8, 12, 16, 18
Other inline	H, U, Square, VR, Opposed, X
Other	Radial, Rotary, Pistonless (Wankel)

SAAB Automobile AB

Subsidiary of GM
Founded 1947
Headquarters TrollhÃ¤ttan, Sweden

Key people Carl-Peter Forster — Chairman
Industry Manufacturing
Products Automobiles
Revenue unknown
Employees 5,503 (2005)
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The straight-4 or inline-4 is an internal combustion engine with four cylinders aligned in one row. Nicknamed a 'i-4', four-banger or a four-pot, this straight engine configuration is the most common in cars with a displacement up to 2.4 litres.
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Engine configuration is an engineering term for the layout of the major components of an internal combustion engine. These components include cylinders, pistons, crankshaft(s) and camshaft(s).
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A cylinder is the central working part of a reciprocating engine, the space in which a piston travels. Multiple cylinders are commonly arranged side by side in a bank, or engine block
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H is the eighth letter in the Latin alphabet. Its name in English is spelled aitch,^[1] pronounced IPA /eɪtʃ/ in most dialects, though in Irish and Indian English it is generally haitch
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flat engine is an internal combustion engine with pistons that are all relatively horizontal. A straight engine canted 90 degrees from straight up is a flat engine, as is one in which the cylinders are arranged in two banks on either side of a single crankshaft.
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crankshaft, sometimes casually abbreviated to crank, is the part of an engine which translates reciprocating linear piston motion into rotation. It typically connects to a flywheel, to reduce the pulsation characteristic of the four-stroke cycle, and sometimes a torsional
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Power-to-weight ratio (specific power) is a calculation commonly applied to engines and other mobile power plants to enable the comparison of one unit (design) to another. Power-to-weight ratio is a measurement of actual performance of any engine (power plant).
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The term aircraft engine, for the purposes of this article, refers to reciprocating and rotary internal combustion engines used in aircraft. Jet engines and turboprops are the other common aviation power plants; while operation differs substantially, the basics here apply to all
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For the Daft Punk song, see .

Aerodynamics (shaping of objects that affect the flow of air or gas) is a branch of fluid dynamics concerned with the study of forces generated on a body in a flow.
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For other meanings of 'Lycoming', please see Lycoming.

The Lycoming engine was produced by Lycoming, one of the Errett Lobban Cord's companies and were used in his Cord and Auburn brands as well as by independent automobile manufacturers in the
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A U engine is a piston engine made up of two separate straight engines (complete with separate crankshafts) joined by gears or chains. It is similar to the H engine which couples two flat engines.
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straight engine (often designated inline engines) is an internal-combustion engine with all cylinders aligned in one row, with no or only minimal offset.

A straight engine is considerably easier to build than an otherwise equivalent horizontally opposed or V engine because
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British Racing Motors (generally known as BRM) was a British Formula 1 motor racing team. Founded in 1945, it raced from 1950 to 1977, competing in 197 Grand Prix and winning 17. In 1962, BRM won the Constructors' Title.
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torque (or often called a moment) can informally be thought of as "rotational force" or "angular force" which causes a change in rotational motion. This force is defined by linear force multiplied by a radius.

The SI unit for torque is the newton meter (N m). In U.S.
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center of mass of a system of particles is a specific point at which, for many purposes, the system's mass behaves as if it were concentrated. The center of mass is a function only of the positions and masses of the particles that comprise the system.
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John Young Stewart, OBE^[2] (born 11 June 1939 in Milton, West Dunbartonshire), better known as Jackie, and nicknamed The Flying Scot, is a Scottish^[3] former racing driver.
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Jim (or Jimmy) Clark OBE (4 March, 1936 – 7 April, 1968) was a Scottish^[2] Formula One racing driver.

He was the dominant driver of his era, winning two World Championships, in 1963 and 1965.
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The Lotus 43 was designed for the 1966 season by Colin Chapman. It was partially based on the Lotus 38 Indycar, due to Chapman's experience at Indy with larger engine capacity and tyre/suspension setup.
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Brough Superior (pr. bruff su-peer-ee-or) motorcycles and motor cars were made by George Brough in his Brough Superior works on Haydn Road in Nottingham, United Kingdom from 1919 to 1940. They were dubbed the "Rolls-Royce of Motorcycles" by H. D.
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Lycoming Engines is a major aircraft engine company, known primarily for its smaller general aviation engines. For most of its history Lycoming has been part of the AVCO group as AVCO Lycoming. In 1987 AVCO was purchased by Textron to become Textron Lycoming.
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The hyper engine was a hypothetical aircraft engine design, an engine that would be able to deliver 1 horsepower per cubic inch (46 kW/L) of engine displacement. The term was used only in the United States, where the Army Air Corps funded development of a hyper engine of
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Napier & Son was a British engine manufacturer and one of the most important aircraft engine manufacturers in the early to mid 20th Century. Their post-World War I Lion was the most powerful engine in the world for some time in the 1920s and into the 1930s, and their Sabre produced
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The Napier Rapier was a 16-cylinder H pattern air-cooled engine designed by Frank Halford and built by Napier & Son before WWII. The Rapier was the first of Napier's H cylinder engines. The rationale for the H is fairly straightforward.
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The Napier Dagger was a 24-cylinder H pattern air-cooled engine designed by Frank Halford and built by Napier & Son before WWII. It was an outgrowth of the earlier Napier Rapier. The rationale for the H is fairly straightforward.
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The Sabre was a 24-cylinder four-stroke sleeve valve piston aircraft engine designed by Major Frank Halford and built by Napier & Son during WWII. It was one of the most powerful piston aircraft engines in the world, especially for inline designs, developing over 3,500
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For the First World War era engine, see .

The Rolls-Royce Eagle 22 was a 24 cylinder sleeve valve aero engine of 46 Litres (2,807 cubic inches) displacement.
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Subaru

Division of Fuji Heavy Industries
Founded FHI established July 7, 1953
first Subaru car introduced 1954
Headquarters Ota, Gunma, Japan

Key people Ikuo Mori, President and CEO
Kenji Kita, founder of Subaru division
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A flat-4 is a four cylinder internal combustion engine where the cylinders are arranged in a flat configuration, also referred to as horizontally opposed. Flat fours can either be a 180-degree V
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flat-6 is a 6 cylinder configuration of a flat engine. The cylinders are laid horizontally, with three on each side, which makes it a short but very wide engine with a low center of gravity.
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