Early Hemi in a 1957 Chrysler 300C

See also: Chrysler Hemi engine

Hemi (from "hemisphere") is a design of internal-combustion engines in which the cylinder head's combustion chamber is of hemispherical form. The term, "Hemi engine", is a trademark of Chrysler Corporation, though the concept is used by many manufacturers. Early Chrysler Hemi engine in 1957 Chrysler 300C. Photo by User:Morven at the weekly Garden Grove, California car show on Friday, May 21, 2004. ... Early Chrysler Hemi engine in 1957 Chrysler 300C. Photo by User:Morven at the weekly Garden Grove, California car show on Friday, May 21, 2004. ... 1957 (MCMLVII) was a common year starting on Tuesday of the Gregorian calendar. ... 1957 Chrysler 300C The Chrysler 300 letter series were high-performance luxury cars built in very limited numbers by the Chrysler Corporation in the United States between 1955 and 1965. ... Early Hemi in a 1957 Chrysler 300C. A Chrysler Hemi engine is one of three different internal combustion engine families from the Chrysler Corporation (or its successor, DaimlerChrysler) that are Hemi engines; in other words, they utilise a hemispherical combustion chamber. ... The word hemisphere literally means half sphere or half ball; when used in the singular form, it refers to one of the halves of a spherical object. ... An internal combustion engine is an engine that is powered by the expansion of hot combustion products of fuel directly acting within an engine. ... The cylinder head from a GMC van. ... A combustion chamber is part of an engine in which fuel is burned. ... A trademark (Commonwealth English: trade mark) is a distinctive sign of some kind which is used by a business to uniquely identify itself and its products and services to consumers, and to distinguish the business and its products or services from those of other businesses. ... The Chrysler Corporation is a United States-based automobile manufacturer, since 1998 merged with Daimler_Benz into DaimlerChrysler. ...

The hemispherical combustion chamber design puts the intake/exhaust valves in-line, rather than side-by-side, allowing for better flow of air through the head. The spark plug in the center of the chamber makes for better ignition of the fuel/air mixture. These aspects help make the hemi-type engine more efficient and powerful, and less prone to engine knock. poppet valve A poppet valve is the type of valve system used in most piston engines, used to seal the intake and exhaust ports. ... This article or section should include material from Spark gap A spark plug is an electrical device that fits into the cylinder head of some internal combustion engines and ignites compressed aerosol gasoline by means of an electric spark. ...

The hemispherical cylinder head increases the engine's efficiency through reduced thermal energy loss and increased airflow through the engine, but drawbacks such as increased production cost has meant that it has been a rare design.

Hemispherical cylinder heads have been used in some engines since they were first used by the Belgian car maker Pipe in 1905. Most applications have been in higher-priced luxury or sporting vehicles, because the hemi design is more expensive to build. Look up pipe in Wiktionary, the free dictionary. ... 1905 (MCMV) was a common year starting on Sunday (see link for calendar). ...

Perhaps the best-known proponent of the Hemi design has been the Chrysler Corporation, who have produced three generations of such engines: the first (the Chrysler FirePower engine) in the 1950s; the second (the 426 Hemi) from the mid 1960s through the mid 1970s; and finally in the early 2000s. Chrysler has used the word "Hemi" extensively in its advertising, to the extent that the word is indelibly associated with Chrysler in North America. The Chrysler Corporation (NYSE: DCX) is a formerly United States-based automobile manufacturer. ... The FirePower was Chryslers first V8 engine. ... // Events and trends This map shows two essential global spheres during the Cold War in 1959. ... The 1960s in its most obvious sense refers to the decade between 1960 and 1969, but the expression has taken on a wider meaning over the past twenty years. ... The 1970s in its most obvious sense refers to the decade between 1970 and 1979. ... This article is about the year 2000. ... World map showing North America A satellite composite image of North America North America is a continent in the northern hemisphere bordered on the north by the Arctic Ocean, on the east by the North Atlantic Ocean, on the south by the Caribbean Sea, and on the west by the...

Porsche has also been a notable user of the Hemi design, generating up to 86 hp per liter displacement on production cars (1973 2.4 L 911S), and even more on racing engines (906 Carrera engine). Jaguar used this head design as well on the legendary XK engines, which powered cars ranging from the Le Mans winning D-Type to the XJ6 sedan. Porsche (), (pronounced porsh-uh) is a German manufacturer of sports cars, founded in 1931 by Ferdinand Porsche, the engineer who created the first Volkswagen. ... Engine displacement is defined as the total volume of air/fuel mixture an engine can draw in during one complete engine cycle; it is normally stated in cubic inches, cubic centimeters, or litres. ... A 1973 Porsche 911 Carrera RS A 1977 Porsche 911s Targa The Porsche 911 is a famous and distinctive sports car made by Porsche AG of Stuttgart, Germany. ... The Porsche 906 or Carrera 6 was a street-legal racing car from Porsche; 65 were produced from 1966. ...

Other manufacturers used the hemispherical design before World War II, including Daimler and Riley. Combatants Allied Powers Axis Powers Commanders {{{commander1}}} {{{commander2}}} Strength {{{strength1}}} {{{strength2}}} Casualties 37 million Civilians 25 million military World War II, also known as the Second World War, was a mid-20th century conflict that engulfed much of the globe and is accepted as the largest and deadliest war in... Logo of Daimler 1898 Daimler car in Bristol Industrial Museum, England Daimler is a British marque of motor car since 1896 and is now a division of Jaguar Cars. ... 1965 Riley 1. ...

Chrysler Hemi engines

Main article: Chrysler Hemi engine

Chrysler's first experience with the Hemi design was during World War 2, in which it developed an experimental 2500 hp (1864 kW) V16 engine for the P-47 Thunderbolt. Experience with this engine led to Chrysler using the Hemi design for their first overhead valve V8 in 1951. This design, the Chrysler FirePower engine, was used until 1959. Early Hemi in a 1957 Chrysler 300C. A Chrysler Hemi engine is one of three different internal combustion engine families from the Chrysler Corporation (or its successor, DaimlerChrysler) that are Hemi engines; in other words, they utilise a hemispherical combustion chamber. ... Combatants Allied Powers Axis Powers Commanders {{{commander1}}} {{{commander2}}} Strength {{{strength1}}} {{{strength2}}} Casualties 37 million Civilians 25 million military World War II, also known as the Second World War, was a mid-20th century conflict that engulfed much of the globe and is accepted as the largest and deadliest war in... A V16 is an internal combustion engine in V configuration, having 16 cylinders. ... The Republic P-47 Thunderbolt, or Jug as it was known, was one of the main US Army Air Force (USAAF) fighters of World War II. The P-47 was a big, rugged, overbuilt aircraft that was effective in air combat but proved particularly useful as a fighter-bomber. ... The Liberty V8 aircraft engine clearly shows the configuration A V8 engine is a V engine with eight cylinders. ... 1951 (MCMLI) was a common year starting on Monday; see its calendar. ... The FirePower was Chryslers first V8 engine. ... 1959 (MCMLIX) was a common year starting on Thursday of the Gregorian calendar. ...

In 1964, Chrysler introduced a new 426 in³ (7.0 L) Hemi, designed to win at NASCAR racing and sold to the public to meet homologation requirements and to enable the public to buy the winning engine. It was based on the Chrysler RB engine big-block. The engine was available through 1971, and the DaimlerChrysler corporation still sells crate engines and parts. It was available in most Mopar muscle cars and pony cars of the period, although its high price and limited street tractability kept sales fairly low. For the Nintendo 64 emulator, see 1964 (Emulator). ... The National Association for Stock Car Auto Racing (NASCAR) is the largest sanctioning body of motorsports in the United States. ... Homologation is a technical term, derived from the Greek homologos for agree, which is used in English to signify the granting of approval by an official authority. ... The RB engine is a big-block V8 engine from Chrysler. ... A big-block engine is a North American V8 in a family of engines which generally have greater than 6 litres (360 cubic inches) of displacement; factory engine sizes reached a peak of 8. ... 1971 (MCMLXXI) is a common year starting on Friday (click for link to calendar). ... Crate engine - Wikipedia, the free encyclopedia /**/ @import /skins-1. ... Mopar (short for MOtor PARts) is the automobile parts and service arm of all the DaimlerChrysler American brands that were formerly owned by the Chrysler Corporation. ... Muscle car is a term for high-performance automobiles, principally referring to American models produced between 1964 to 1974. ... A pony car is a class of automobile. ...

Chrysler introduced a modern Hemi in 2002. This engine is not a true hemispherical head engine; it has a polyspherical combustion chamber, but retains the Hemi's traditional inline perpendicular valves. This engine replaced Chrysler's large LA family of engines, particularly the Magnum 5.9, in the early 2000s. It is available in two sizes; 5.7 and 6.1 liters. Some versions utilise a variable displacement technology called the Multi-Displacement System (MDS) to improve fuel economy. The LA engine (light or low A engine) was an evolution of the small-block Chrysler A engine. ... The LA engine (light or low A engine) was an evolution of the small-block Chrysler A engine. ... Saddam Hussein shortly after his capture Major controversy over U. S. presidential election (November 7-December 13, 2000) September 11, 2001 terrorist attack on New Yorks World Trade Center and Virginias Pentagon killing almost 3000 people. ... Variable displacement is an automobile engine technology that allows the engine displacement to change for improved fuel economy. ... DaimlerChryslers Multi-Displacement System (MDS) is an automobile engine variable displacement technology. ... Fuel efficiency, sometimes also referred to as fuel economy and commonly gas mileage in the United States, is a numeric measure often used to describe the amount of fuel consumed with regard to the distance travelled in a transportation vehicle, such as an automobile. ...

Porsche Hemi engines

When Porsche introduced the 911, it had a 2.0 L flat-6 engine, with hemispherical heads. The basic design did not change much until 1996, when Porsche moved to water cooling. Porsche (), (pronounced porsh-uh) is a German manufacturer of sports cars, founded in 1931 by Ferdinand Porsche, the engineer who created the first Volkswagen. ... A 1973 Porsche 911 Carrera RS A 1977 Porsche 911s Targa The Porsche 911 is a famous and distinctive sports car made by Porsche AG of Stuttgart, Germany. ... The flat-6 engine of the Honda Valkyrie motorcycle A flat-6 is a 6 cylinder configuration of a flat engine or boxer engine. ... 1996 (MCMXCVI) is a leap year starting on Monday of the Gregorian calendar, and was designated the International Year for the Eradication of Poverty. ... Watercooling is a method of heat removal from components. ...

some notable engines designed and used by Porsche in both customer production car and Race cars:

The classic Hemi engines of the 1960s featured true hemispherical heads, and splayed (perpendicular) valves. Porsche 917/20 Pink Pig in Stuttgart Zuffenhausen Porsche 917/30 in Stuttgart Zuffenhausen The type 917 gave Porsche its first overall wins at the 24 hours of Le Mans in 1970 and 1971. ... Porsche 917/20 Pink Pig in Stuttgart Zuffenhausen Porsche 917/30 in Stuttgart Zuffenhausen The type 917 gave Porsche its first overall wins at the 24 hours of Le Mans in 1970 and 1971. ... Turbocharger Cut-away A turbocharger is a device used in internal-combustion engines to increase the power output of the engine by increasing the mass of oxygen and fuel entering the engine. ... The 1960s in its most obvious sense refers to the decade between 1960 and 1969, but the expression has taken on a wider meaning over the past twenty years. ...

Mitsubishi Hemispherical Engines

Beginning production circa 1969 was the 4G13, a prototype engine used in the first Mitsubishi Lancer. Its displacement was very small, a 1.3 liter motor. The spark plugs were not in the centre of the dome, but slightly off to the exhaust side. In 1974, 4G14 (1,436cc, 89.8 cu.in) unit (indeed, its entire driveline) was used by Hyundai Motor Company to power the Pony, until 1983 when the 4G16 (1,597 cc, roughly 98.7 cu.in) was used in the Stellar, and in 1985 on the PonyII. The "hemi" was used in other Chrysler cars (presumably in early model Dodge Lancers) as well as several mitsubishi vehicles. The largest being the 4G16 makes 101 Hp @6000 RPM and 110 ft·lbf @ 4000 RPM. They are I4, crossflow aluminum head, chaindriven 8 valve SOHC units. Perhaps the smallest hemispherical engine, the 4G12, a 1.2L engine, was used in european and middle eastern Pony cars and pickups.

External link

• How Stuff Works/Hemi page
• Infamous Chrysler Hemi