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Wikipedia about HEMI

For: Chrysler Hemi engine

SOHC%20Hemi%20Chamber.jpg

Hemispherical combustion chambers, which had been used for centuries in mortars and cannon, were introduced on some of the earliest automotive engines, shortly after proving the concept of internal combustion engines themselves.

Technology & implementation

1903%20premier.jpg

With the hemispherical combustion chamber design, the intake and exhaust valves are usually on opposite sides of the chamber, unlike the in-line valve arrangement common to most engines with wedge-shaped combustion chambers. Therefore, significant challenges in the commercialization of hemi engines revolved around the design of the valve actuation, and how to make it effective, efficient, and reliable at an acceptable cost. Early in Chrysler's development of their 1950s hemi engine, the head was referred to in company advertising as the Double Rocker head.

Benefits & drawbacks

Although a wedge-head design offers simplified valve actuation, it usually requires the air/fuel mixture to make sharp turns en route to and from the chamber. With a hemispherical chamber, larger valves are possible and a straighter, less restrictive flow path can be provided for the air/fuel mixture. This improves engine breathing. Placing the spark plug near the center of the chamber aids in achieving complete combustion of the fuel/air mixture, though it is not mandatory.

Drawbacks of the hemispherical chamber such as increased production cost, high relative weight (25% heavier than a comparable wedge head per Chrysler's engineers), poor low-rpm performance characteristics and difficulty meeting emissions standards have pushed the hemi head out of favor.

History & usage

Hemispherical cylinder heads have been used since at least 1903; they were used by the Belgian car maker Pipe in 1905], the Peugeot Grand prix Car of 1912, the Alfa Romeo GP car of 1914, Daimler, and Riley. Stutz built four valve engines, conceptually anticipating modern car engines. The BMW double push rod design, taken over by Bristol Cars, the Peugeot 403 and the Toyota T engine are other well known hemi engines. Harry Arminius Miller racing engines were also a notable example .

Chrysler

Perhaps the most widely known proponent of the hemispherical chamber design is the Chrysler Corporation. Chrysler became identified primarily by trademarking the "Hemi" name and then using it extensively in their advertising campaigns beginning in the 1960s. Chrysler has produced three generations of such engines: the first (the Chrysler FirePower engine) in the 1950s, the second (the 426 Hemi), developed for NASCAR in 1964 and produced through the early 1970s, and finally the "new Hemi" in the early 2000s. The "Hemi" engine introduced in 2002 by DaimlerChrysler had a combustion chamber featuring valve and spark plug locations markedly different from the 426ci Hemi engine of muscle car fame. The current-production "Hemi" V8 with its pinched chamber, does not have true hemispherical combustion chambers despite the name. Rather, it bears a closer resemblance to the mid-1950s Polyspherical chamber, which Chrysler engineers developed as a lower-cost alternative head for their V8 engines. The Polyspherical head needed less metal and was narrower due to using only one rocker shaft. This saved costs in material, space and warranty claims and allowed it to be used in smaller vehicles. Chrysler's Australian-market Hemi-6 of 1970-80 had partial-spherical hemi chambers, though they were only 35% of a sphere.

Search results for HEMI

The new Dodge Hemi V8 engine

The revolutionary Mopar Hemi V8 engines for Dodge cars and trucks ... The ever-accurate oh20 had predicted, in mid-2007, that the Hemi would get variable cam timing. ...www.allpar.com/mopar/new-mopar-hemi.html

Hemi Overview

When the 426 Hemi was introduced in 1964, it was strictly a racing engine. ... Restored Hemi muscle cars carry astronomical prices. ...www.allpar.com/mopar/hemi/hemi.html

Mopar's Infamous Hemi

Tribute to Chrysler's Hemi V8 engines.www.thehemi.com/

Chrysler Corporation Early Hemi Engines

One in a series of URLs about the Early Chrysler Hemi Engine. ... Hemi Pictures | PolyWhat? ... Intermixed with the Hemi head engines is details of the Poly ...classichemi.com/

Mr HEMI's 426-HEMI Internet Site

Mr. HEMI's 426-HEMI Internet Site -- Dedicated to the unrepentent worship of the ... There's a signpost ahead -- You are entering the 426 - HEMI Zone ! ...www.426-hemi.com/

Images found for HEMI

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News about HEMI

Infomercial Expert, Global Media Marketing, Launches First National Infomercial Campaign for Dodge Ram

Business Wire via Yahoo! Finance SANTA ANA, Calif.----Global Media Marketing, www.glblmedia.com, a leading supplier of infomercials and other direct response media products, announced today that it has launched a major Infomercial program for Dodge Ram, www.dodge.com.http://biz.yahoo.com/bw/080905/20080905005313.html?.v=1

DNA Editing Tool Flips Its Target

Science DailyImagine having to copy an entire book by hand without missing a comma. Our cells face a similar task every time they divide. They must duplicate both their DNA and a subtle pattern of punctuation-like modifications on the DNA known as methylation. Scientists have caught in action one of the tools mammalian cells use to maintain their pattern of methylation. Visualized by X-ray crystallography, ...http://www.sciencedaily.com/releases/2008/09/080903134213.ht...

Events calendar

The Times-NewsChristian Movie Night will feature "Bless You Prison" at 7 p.m. at River Christian Fellowship. Free admission. At 6 p.m., pizza and salad will be available for a donation. Information: 733-3133. River Christian is at the corner of Falls Avenue East and Shoshone Falls Road.http://www.magicvalley.com/articles/2008/09/05/features/frid...

A chat with Jim Press, vice chairman and president of Chrysler

San Jose Mercury NewsJim Press, a Toyota lifer and one of the people most responsible for that brand's U.S. success, stunned the auto industry by joining Chrysler in 2007. Green energy | Drive http://www.mercurynews.com/business/ci_10381832?source=rss

News and Features for Wasilla, Alaska

Mat-Su Valley FrontiersmanPALMER — It took the intervention of a Good Samaritan midday Sunday to prevent a man from stealing a young mother’s newborn at the Alaska State Fair. Strawberry, a Duroc-Yorkshire gilt hog owned by Bob Shumaker, gave birth to her first litter early Sunday morning.http://www.frontiersman.com/articles/2008/09/05/local_news/d...

News about Hemi

Camaro Trumps Dodge Challenger

BusinessWeekThe lines are perfect and the Hemi 6.1L or hopefully 6.4L mated to the Viper Spec 6 sp would be the perfect modern day Mustang & C6 slayer. It would cost DCX pennies, relatively speaking, to bring this car to MKT as the infrustructure is already in ... http://www.businessweek.com/autos/autobeat/archives/2006/01/...

15 years for pedophile murder

News.com.auIn the South Australian Supreme Court today, Justice John Sulan said Jeffrey Payne, 56, had his skull crushed in the attack by Adelaide man Timothy Hemi Schaefer. Justice Sulan said Schaefer, 20, suffered from complex psychiatric problems and was ... http://www.news.com.au/couriermail/story/0,23739,24459817-95...

Philip Hensher: Thank God for the Bible Society

The IndependentToktok hemi stap finis nao". There has been more than one translation of the Bible into Scots, or Lallans. I have in front of me a perhaps more satirically intended translation of the Bible into Polari, the post-war gay slang, carried out by the ... http://www.independent.co.uk/opinion/commentators/philip-hen...

Dave on Demand: Ramming the product into the plot

Philadelphia InquirerI kept expecting Derek to pull over and lift the hood so we could get a good look at the Hemi engine. This wasn't product placement. It was product bombardment. Come fly with me. Speaking of flagrant promotion, on NBC's Heroes , Matt was suddenly whisked ... http://www.philly.com/inquirer/magazine/20081011_Dave_on_Dem...

Deal likely wouldn't profit Chrysler community much

Detroit Free PressChrysler has one of the world's best engines in its Hemi V8, and a new high-tech V6 on the way. GM's small-block V8 is outstanding, though, and the company's 3.6L V6 engines offer the same technologies Chrysler's Phoenix V6 will have in 2010. Chrysler ... http://www.freep.com/article/20081012/COL14/810120465/1002/B...

Search results for Hemi

HEMI : The Official Chrysler HEMI engine Web site

2007 Chrysler LLC | All Rights Reserved.| Privacy Statement, Legal Notices and Terms of Use. http://www.hemi.com/hemi.html

Mopar's Infamous Hemi

Tribute to Chrysler's Hemi V8 Engine ... The most recent news : NMCA Hosts Late-Model HEMI Class: Saleen's SMS 296 Supercharger for 5.7 and 6.1 HEMIshttp://www.thehemi.com/

"The Premiere website for Hemi Ram and Hemi SUVs."

Welcome to HemiTruckClub.com! Over 5000 registered members and growing bigger everyday!! Click here for rally/GTG pics! MrTruck’s review of the 2009 Dodge ... http://hemitruckclub.com/

Hemi Overview

426 Hemi Introduction (by Steve Boelhouwer) Hemi. Few words in the automotive world are more instantly recognizeable than this legendary term. From its original stock car roots to ... http://www.allpar.com/mopar/hemi/hemi.html

hemi- definition |Dictionary.com

Sponsored Links Hemi Test the rear-wheel drive American car with German engineering www.Dodge.com/Chargerhttp://dictionary.reference.com/search?q=hemi-
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Videos found for HEMI

1970 Dodge Challenger 528 Hemi Inje...

1970 Dodge Challenger 528 Hemi Injected Blown on Achohol ...1970 Dodge Challenger 528 Hemi Injected Blown on AchoholFlash - Video

Busrod med Hemi & manuell

Busrod med Hemi & manuellVi var och tog en kaffe på ett lokalt fik...och mullrandes kom en inte speciellt bekymrad bildåre med ett leende på läpparna. Inget för den som är över 180cm lång......Flash - Video

Dodge Ram 1500 Quad Laramie 5.7 HEM...

Dodge Ram 1500 Quad Laramie 5.7 HEMI - videoA market leader in America, and now on sale in the UK, the Dodge Ram pick-up rises above the European...Video - Video

Dodge Ram 1500 Quad Laramie 5.7 HEM...

Dodge Ram 1500 Quad Laramie 5.7 HEMI - videoA market leader in America, and now on sale in the UK, the Dodge Ram pick-up rises above the European...Windows Media - Video

It pays to have a Hemi

It pays to have a Hemisweet.Flash - Video

Videos found for HEMI

hemi_press_LO.wvx

hemi_press_LO.wvxfreightliner_beauty_.. 17-Jun-2005 09:42 1k hemi_northwest_LO.wvx 17-Jun-2005 09:42 1k hemi_press_LO.wvx 16-Jun-2005 11:06 1k hemi_press_HI.wvx 16-Jun-2005 11:06 1kmsmedia: 0 MB w:240px - h:180px

hemi_northwest_LO.wvx

hemi_northwest_LO.wvxhemi_press_LO.wvx 16-Jun-2005 11:06 1k hemi_press_HI.wvx 16-Jun-2005 11:06 1k hemi_northwest_LO.wvx 17-Jun-2005 09:42 1k hemi_northwest_HI.wvx 17-Jun-2005 09:42 1kmsmedia: 0 MB w:240px - h:180px

wk_hemi_track_56k.wmv

wk_hemi_track_56k.wmvAcceleration 0-60 Acceleration 20-65 Braking 70-0 WK Hemi performance video 300k (4.5mb / Length 01:44) WK Hemi performance video 56k (1.07mb / Length 01:44)msmedia: 1.0 MB w:320px - h:240px

hemi-vs-mustang.WMV

hemi-vs-mustang.WMVGot some Hemi Ram kills from DTO... Enjoy Hemi v/s Mustang http://www.dodgetrucks.org/home/hemilove/hemi-vs-mustang.WMV Hemi v/s Cameromsmedia: 0.3 MB w:320px - h:240px

NewjeepHEMI.wmv

NewjeepHEMI.wmvmsmedia: 13.5 MB w:320px - h:240px

Answers for HEMI

boxbeatle

Is Dodge the only auto company to use a Hemi?

boxbeatleIt's really the Chrysler Corporation that uses that name brand. It stands for the shape of the engine heads or combustion chamber. Here's a link to other car makes. http://en.wikipedia.org/wiki/Hemi

Why is the new dodge engine refereed to as a hemi?

The heads are NOT hemispherical, despite what people might think. You cannot have a hemisphere when you have all those valves in there. It is really a pent-roof chamber, but since the spark plugs go...
pappa pops

how much would it cost to get a hemi-engine put in to a jeep wrangler?

pappa popsVery expensive. Sell your current one and buy the new Jeep, it can be ordered with a hemi. Otherwise you could buy a late model hemi from a wrecked vehicle if you're lucky in the 2k to 5k range. ...
cesar g

Is Dodge going to give away a hemi engine with purchase of vehicle?

cesar gAccording to the Detroit News (01/04/07), Yes they will be. In attempts to boost sluggish 2006 sales the $1,700 option for the HEMI will be waived. So if you were purchasing a Chrysler group vehicle (...
Keith P

What type of Ignition should I put in my 04 Dodge 5.7l Hemi?

Keith Pse f malory makes one you are going to have a problem with the obd2 or can computer system try upgrading the coils insted

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