Hemi engine

Perhaps the smallest hemispherical engine, the 4G12, a 1.2 L engine, was used in European and Middle Eastern Pony cars and pickups. For example, emergency response to natural disasters can be improved, even though each individual disaster is, in itself, absolutely unique. They are I4, crossflow aluminum head, chaindriven 8 valve SOHC units. This approach is challenged in less meta-historical terms with the notion that historical lessons can and should be drawn from events, and that careful generalizations of unique events is useful. The largest being the 4G16 makes 101 hp (75 kW) @6000 rpm and 110 ft·lbf (149 N·m) @ 4000 rpm. In this view, the specific combination of factors at any moment in time can never be repeated, and so knowledge about events in the past can not be directly and beneficially applied to the present. The "hemi" was used in other Chrysler cars (presumably in early model Dodge Lancers) as well as several mitsubishi vehicles. Yet another view is that history does not repeat itself because of the uniqueness of any given historical event.

In 1974, 4G14 (1,436 cc, 89.8 in³) unit (indeed, its entire driveline) was used by Hyundai Motor Company to power the Pony, until 1983 when the 4G16 (1,597 cc, roughly 99 in³) was used in the Stellar, and in 1985 on the PonyII. An alternative view is that the forces of history are too great to be changed by human deliberation, or that, even if people do change the course of history, the movers and shakers of this world are usually too self-involved to stop to look at the big picture. The spark plugs were not in the centre of the dome, but slightly off to the exhaust side. Winston Churchill alluded to another philosophy of history when he quipped, "History will be kind to me for I intend to write it." Churchill had been a journalist, and was a very influential memoirist, but it's likely his joking comment didn't refer to his own literal writing, but was a variant of the famous: "History is written by the victors." In this view, the winners in human conflicts get to put their own spin on historic events. Its displacement was very small, a 1.3 liter motor. One of the most famous quotations about history and the value of studying history, by Spanish philosopher, George Santayana, reads: "Those who cannot remember the past are condemned to repeat it." The German Philosopher, Georg Wilhelm Friedrich Hegel remarked in his Philosophy of history that: "What history and experience teach us is this: that people and government never have learned anything from history or acted on principles deduced from it." This was famously paraphrased by the British statesman, Winston Churchill into: "The one thing we have learned from history is that we don't learn from history.". Beginning production circa 1969 was the 4G13, a prototype engine used in the first Mitsubishi Lancer. From history we may learn factors that result in the rise and fall of nation-states or civilizations, motivations for political actions, the effects of social philosophies, and perspectives on culture and technology.

The classic Hemi engines of the 1960s featured true hemispherical heads, and splayed (perpendicular) valves. In addition to being an interesting topic of study in its own right, historians often claim that the study of history teaches valuable lessons with regard to past successes and failures of leaders, economic systems, forms of government, and other recurring themes in the human story. some notable engines designed and used by Porsche in both customer production car and Race cars:. Evans, a professor of modern history at Cambridge University, defended the worth of history. The basic design did not change much until 1996, when Porsche moved to water cooling. In his book In Defense of History, Richard J. When Porsche introduced the 911, it had a 2.0 L flat-6 engine, with hemispherical heads. In recent years, postmodernists have challenged the validity and need for the study of history on the basis that all history is based on the personal interpretation of sources.

Also, at the 2005 SEMA show, Chrysler unvieled a 505-horsepower 6.4L HEMI which will be available as a crate engine and might find its way into production, perhaps with reduced horsepower. American historians, motivated by the civil rights era, focused on formerly overlooked ethnic, racial, and socio-economic groups. Some versions of the 5.7L, including most 2006 production units, utilise a variable displacement technology called the Multi-Displacement System (MDS) to improve fuel economy. French historians introduced quantitative history, using broad data to track the lives of typical individuals. It is available in two sizes; 5.7 and 6.1 liters. During the 1960's historians transitioned from epic nationalistic narratives that tended to glorify the nation or individuals to more realistic chronologies. This engine replaced Chrysler's large LA family of engines, particularly the Magnum 5.9, in the early 2000s. Taylor.

This engine is not a true hemispherical head engine; it has a polyspherical combustion chamber, but retains the Hemi's traditional inline perpendicular valves. Trevelyan and A.J.P. Chrysler introduced a modern Hemi in 2002. Historians of note who have advanced the historical methods of study include Leopold von Ranke, Lewis Bernstein Namier, Geoffrey Rudolph Elton, G.M. Hemi.com provides information on three eras of Hemi power: 1951 to 1959, 1964 to 1971 and 2002 to current. This is somewhat similar to the alternative history genre of fiction. Racers like "Big Daddy" Don Garlits have set many world records using Hemi power. A form of historical speculation known commonly as virtual history ("counterfactual history") has also been adopted by some historians as a means of assessing and exploring the possible outcomes if certain events had not occurred or had occurred in a different way.

The Hemi head design is so efficient and effective that it was, and is, a top performer in NHRA, IHRA, UDRA and other sanctioned drag racing events throughout the world. Although there is arguably some intrinsic bias in historical studies (with national bias perhaps being the most significant), history can also be studied from ideological perspectives, such as Marxist historiography. Hemi blocks were traditionally painted orange to distinguish them from other V8s. Historiography is the study and analysis of history through a belief system or philosophy. 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. See full article: Historiography. The engine was available through 1971, and the DaimlerChrysler corporation still sells crate engines and parts. Historian in the sense of a "researcher of history" in a higher sense than that of an annalist or chronicler, who merely record events as they occur, is attested from 1531.

It was based on the Chrysler RB engine big-block. The adjective historical is attested from 1561, and historic from 1669. 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. A sense of "systematic account" without a reference to time in particular was current in the 16th century, but is now obsolete. This design, the Chrysler FirePower engine, was used until 1959. In German, French, and indeed, most languages of the world other than English, this distinction was never made, and the same word is used to mean both "history" and "story". Experience with this engine led to Chrysler using the Hemi design for their first overhead valve V8 in 1951. The restriction to the meaning "record of past events" in the sense of Herodotus arises in the late 15th century.

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. In Middle English, the meaning was "story" in general. . (The asterisk before a word indicates that it is a hypothetical construction, not an attested form.) 'ἱστορία, historía, is an Ionic derivation of the word, which with Ionic science and philosophy were spread first in Classical Greece and ultimately over all of Hellenism. Other manufacturers used the hemispherical design before World War II, including Daimler and Riley. ἵστωρ is ultimately from the Proto-Indo-European *wid-tor-, from the root *weid- ("to know, to see"), also present in the English word wit, the Latin words vision and video, the Sanskrit word veda, and the Slavic word videti, as well as others. 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. The spirant is problematic, and not present in cognate Greek eídomai ("to appear").

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). Early attestations of ἵστωρ are from the Homeric Hymns, Heraclitus, the Athenian ephebes' oath, and from Boiotic inscriptions (in a legal sense, either "judge" or "witness," or similar). Chrysler has used the word "Hemi" extensively in its advertising, to the extent that the word is indelibly associated with Chrysler in North America. This, in turn, was derived from ἵστωρ, hístōr ("wise man," "witness," or "judge"). 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. The term history entered the English language in 1390 with the meaning of "relation of incidents, story" via the Old French historie, from the Latin historia "narrative, account." This itself was derived from the Ancient Greek ἱστορία, historía, meaning "a learning or knowing by inquiry, history, record, narrative," from the verb ἱστορεῖν, historeîn, "to inquire.". Most applications have been in higher-priced luxury or sporting vehicles, because the hemi design is more expensive to build. Sources that can give light on this past such as oral history, linguistics, and genetics, have all become accepted by mainstream historians.

Hemispherical cylinder heads have been used in some engines since they were first used by the Belgian car maker Pipe in 1905. In general history is today seen as the study of everything that is known about the human past (but even this barrier is being challenged by new fields such as Big History). Placing the intake on the opposite side of the engine also reduces the air intake temperature and increases efficiency. Today there is no generally accepted definition for when history begins. 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. In recent decades the barriers between history and prehistory have thus largely disappeared. These aspects help make the hemi-type engine more efficient and powerful, and less prone to engine knock. The distinction was also criticized because of its implicit exclusion of certain civilizations, such as those of Sub-Saharan Africa and pre-Columbian America from the historical record.

The spark plug in the center of the chamber makes for better ignition of the fuel/air mixture. Additionally, "prehistorians" such as Vere Gordon Childe were using archaeology to explain important events in areas that were traditionally in the field of history. 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 (although the inlet and exhaust valves are not simultaneously open and there is no continuous flow). Historians were looking beyond traditional political history narratives with new approaches such as economic, social and cultural history, all of which relied on various sources of evidence. Chrysler's main innovation was to build them in such large numbers. In the twentieth century the artificial division between history and prehistory was proving problematic. Stutz had built four valve engines, resembling modern car engines. A new term, prehistory, was coined, to encompass the results of these new fields where they yeilded information about times prior to the existence of written records.

Harry Arminius Miller racing engines were more notable example. Some traditional historians questioned whether these new studies were really history, since they were not limited to the written word. The BMW double push rod design, taken over by Bristol Cars, and the Peugeot 403 are other well known examples. However with the rise of academic professionalism and the creation of new scientific fields in the 19th and 20th centuries came a flood of new information that challenged this notion — archaeology, anthropology and other social sciences were providing new information and even theories about human history. The term, "Hemi engine", is a trademark of Chrysler Corporation, though the concept is used by many manufacturers. Traditionally the study of history was limited to the written and spoken word. Hemi (from "hemisphere") or "crossflow cylinder head" is a design of internal-combustion engines in which the cylinder head's combustion chamber is of hemispherical form. Historical records have been maintained for a variety of reasons, including administrative (such as censuses, tax records, commercial records), political (glorification or criticism of leaders and notable figures), religious, artistic, sporting (notably the Olympics), genealogical, personal (letters), and entertainment.

Different approaches may be more common in the study of some periods than in others, and perspectives of history (historiography) vary widely. For modern history, primary sources may include photographs, motion pictures, and audio and video recordings. Historians obtain information about the past from various kinds of sources, including written or printed records, coins or other artifacts, buildings and monuments, and interviews (oral history). Recent developments in the practice of history have sought to address this.

Some people have criticized historical study, saying that it tends to be too narrowly focused on political events, armed conflicts, and famous people and that deeper and more significant changes in terms of ideas, technology, family life and culture warrant more attention. There are several different ways of classifying historical information:. Wells and Will Durant & Ariel Durant, have written universal histories, most historians specialize. While several writers, such as H.G.

Because history is such a large subject, organization is crucial. . However, in modern academia, history is increasingly classified as a social science, especially when chronology is the focus. Traditionally, the study of history has been considered a part of the humanities.

Knowledge of history is often said to encompass both knowledge of past events and historical thinking skills. When used as the name of a field of study, history refers to the study and interpretation of the record of humans, families, and societies. History is information about the past. Topical (by subject or topic).

Ethnic (by ethnic group). National (by nation). Geographical (by region). Chronological (by date).