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The cycle begins at top dead center (TDC), when the piston is farthest away from the axis of the crankshaft. On the intake or induction stroke of the piston, the piston descends from the top of the cylinder, reducing the pressure inside the cylinder. A mixture of fuel and air is forced (by atmospheric or greater pressure) into the cylinder through the intake (inlet) port. The intake (inlet) valve (or valves) then close(s), and the compression stroke compresses the fuel–air mixture.

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Wikipedia About Four-stroke

4-Stroke-Engine.gif

The cycle begins at top dead center (TDC), when the piston is farthest away from the axis of the crankshaft. On the intake or induction stroke of the piston, the piston descends from the top of the cylinder, reducing the pressure inside the cylinder. A mixture of fuel and air is forced (by atmospheric or greater pressure) into the cylinder through the intake (inlet) port. The intake (inlet) valve (or valves) then close(s), and the compression stroke compresses the fuel–air mixture.

The air–fuel mixture is then ignited near the end of the compression stroke, usually by a spark plug (for a gasoline or Otto cycle engine) or by the heat and pressure of compression (for a Diesel cycle or compression ignition engine). The resulting pressure of burning gases pushes the piston through the power stroke. In the exhaust stroke, the piston pushes the products of combustion from the cylinder through an exhaust valve or valves.

The Otto cycle

The four-stroke engine was first patented by Eugenio Barsanti and Felice Matteucci in 1854, followed by a first prototype in 1860. It was also conceptualized by French engineer, Alphonse Beau de Rochas in 1862.

However, the German engineer Nicolaus Otto was the first to develop a functioning four-stroke engine, which is why the four-stroke principle today is commonly known as the Otto cycle and four-stroke engines using spark plugs often are called Otto engines. The Otto Cycle consists of adiabatic compression, heat addition at constant volume, adiabatic expansion and rejection of heat at constant volume.

Fuel octane rating

main: Octane rating Internal combustion engine power primarily originates from the expansion of gases in the power stroke. Compressing the fuel and air into a very small space increases the efficiency of the power stroke, but increasing the cylinder compression ratio also increases the heating of the fuel as the mixture is compressed (following Charles's law).

A highly flammable fuel with a low self-ignition temperature can combust before the cylinder reaches top-dead-center, potentially forcing the piston backwards against rotation. Alternately, a fuel which self-ignites at top-dead-center but before the cylinder has started downwards can damage the piston and cylinder due to the extreme thermal energy concentrated into a very small space with no relief. This damage is often referred to as engine knocking and can lead to permanent engine damage if it occurs frequently.

The octane rating is a measure of the fuel's resistance to self-ignition, by increasing the temperature at which it will self-ignite. A fuel with a greater octane rating allows for a much higher compression ratio without the risk of damage due to self-ignition.

Diesel engines rely on self-ignition for the engine to function. They solve the engine damage problem by separately injecting high-pressure fuel into the cylinder shortly before the piston has reached TDC. Air without fuel can be compressed to a very high degree without concern for self-ignition, and the highly pressurized fuel in the fuel injection system cannot ignite without the presence of air.

Search results for Four-stroke

four-stroke cycle: Definition from Answers.com

four-stroke cycle ( ¦för ¦strōk ′sīkəl ) ( mechanical engineering ) An internal combustion engine cycle completed in four pistonwww.answers.com/topic/four-stroke-cycle

4Strokes.com - Dirt Bikes, ATVs & Dual Sport Motorcycles

4Strokes.com Home Page ... is a Website for enthusiasts of four-stroke off-road and dual-sport motorcycles ... the more popular four-stroke dirt bikes, dual ...www.4strokes.com/

Four Stroke Internal Combustion Engine

Explains the strokes of internal combustion engines using animations from ... internal combustion engine is called a four-stroke engine because there are four ...www.grc.nasa.gov/WWW/K-12/airplane/engopt.html

Welcome to Four Stroke Tech.net!

Your browser does not support inline frames or is currently configured not to display inline frames. ...www.fourstroketech.net/

Four-stroke - Wikicars

The four-stroke internal combustion engine is the cycle most ... original configuration, the four-stroke engine relies entirely ... Four Stroke Engine ...wikicars.org/en/Four-stroke

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News about Four-stroke

Woods ready for next step in comeback

The Tampa TribuneSince returning to PGA Tour play this season following a nine-month break after knee surgery, Tiger Woods hardly has struggled. In five tournament appearances, he has one victory and top-10 finishes in four of four stroke-play events.http://www2.tbo.com/content/2009/may/07/070048/sp-woods-read...

Haziq wipes out deficit

The New Sabah TimesKUALA LUMPUR : Former national trainee, Haziq Hamizan carded a three-under 69, the lowest score of the day, to wipe out a four-stroke deficit and share the lead after the second round of the Malaysian Amateur Closed Championship held at Kinrara Golf Club, here yesterday.http://www.newsabahtimes.com.my/nstweb/fullstory/28436

Plane aims to hit the streets

Tacoma News Tribune“This is the coolest thing I’ve ever seen,” said David Green, 20, of Orlando, Fla. “I really hope they can get it off the ground.”http://www.thenewstribune.com/business/story/735962.html

Flying car is no pie-in-sky dream

Columbus Ledger-EnquirerLAKELAND, Fla. — “This is the coolest thing I’ve ever seen,” said 20-year-old David Green of Orlando, Fla. “I really hope they can get it off the ground.”http://ledger-enquirer.com/102/story/713690.html

Washington's Wallace Named Pac-10 Golfer of the Month for April

Pac 10Wallace won the Pac-10 Championship with a whopping 4-stroke victory. WALNUT CREEK, Calif.-- Darren Wallace of Washington has been named Pacific-10 Conference Golfer of the Month for April 2009.http://www.pac-10.org/sports/c-golf/spec-rel/050809aac.html

News about Four-stroke

Woods ready for next step in comeback

Tampa Bay OnlineSince returning to PGA Tour play this season following a nine-month break after knee surgery, Tiger Woods hardly has struggled. In five tournament appearances, he has one victory and top-10 finishes in four of four stroke-play events. "Not too bad ... http://www2.tbo.com/content/2009/may/07/070048/sp-woods-read...

Provincial ban on two-stroke rickshaws: Initial stage of rickshaw ban ...

Daily TimesThe Punjab Transport Department decided in 2005 to replace two-stroke rickshaws and motorcycle rickshaws with four-stroke rickshaws that work on compressed natural gas (CNG) in Lahore, Multan, Faisalabad, Rawalpindi and Gujranwala by the end of 2007 ... http://www.dailytimes.com.pk/default.asp?page=2009\05\03\sto...

Woods: Distance still improving

ESPN.comAfter being eliminated in the second round of his comeback event, he has since won a title and recorded three other top-10s in just four stroke-play appearances. "I've done all right, all things considered," said the 33-year-old, who clinched his 66th ... http://sports.espn.go.com/golf/news/story?id=4141861

Cejka Opens a Lead in the Players

New York TimesAt 11-under-par 133 with half the field still on the golf course, Cejka held a four-stroke over his Las Vegas neighbor Kevin Na, who shot 66, and the Masters champion Ángel Cabrera , whose round of 65 was the low of the first half of the day. That ... http://www.nytimes.com/2009/05/09/sports/golf/09golf.html?re...

Conclusion of WCAC Tournament Suspended

Washington PostFirst-round leader Tyler Wingo of Paul VI Catholic, who was the only player to break par with a 3-under 68 in last week's first round, was 4 over par through six holes yesterday but still held a four-stroke lead over teammate Jay Pinkos and defending ... http://www.washingtonpost.com/wp-dyn/content/article/2009/05...

Search results for Four-stroke

Four-stroke engine: Definition from Answers.com

four-stroke cycle ( ¦för ¦strōk ′sīkəl ) ( mechanical engineering ) An internal combustion engine cycle completed in four pistonhttp://www.answers.com/topic/four-stroke-cycle

Four Stroke Association

B E A P A R T O F T H E A S S O C A T I O N. Visit our Forum Site to see what events are coming up and how you can participate in the Four Stroke Association series.http://www.fourstrokeassociation.com/

What is the Difference Between a Two Stroke and Four Stroke Engine?

Brief and Straightforward Guide: What is the Difference Between a Two Stroke and Four Stroke Engine?http://www.wisegeek.com/what-is-the-difference-between-a-two...

Four-stroke Combustion Engine

Java-Applet: Ottomotor ... In combustion engines the inner energy set free by combustion ( e.g. of gasioline or Diesel fuel ) is changed partly into mechanical energy.http://www.k-wz.de/vmotor/v_omotore.html

four-stroke.com

SuperTTR.com The TTR Underground . In a world full of tight-assed politically correct poser websites I figured we needed a place where being a guy, burning exotic fuels, and ... http://www.four-stroke.com/

Wikipedia results for Four-stroke

Four-stroke engine - Wikipedia, the free encyclopedia

Today, internal combustion engines in cars, trucks, motorcycles, aircraft, construction machinery and many others, most commonly use a four-stroke cycle.http://en.wikipedia.org/wiki/Four-stroke_cycle

Yamaha YZ450F - Wikipedia, the free encyclopedia

The YZ450F is a four stroke big bore racing motocross bike built by Yamaha. It is considered by most to be the starter of the four stroke dirt bike revolution.http://en.wikipedia.org/wiki/YZ450

Atkinson cycle - Wikipedia, the free encyclopedia

While a modified four-stroke engine using the Atkinson cycle provides good fuel economy, it is at the expense of a lower power-per-displacement than a traditional four-stroke [1]http://en.wikipedia.org/wiki/Atkinson_cycle

Poppet valve - Wikipedia, the free encyclopedia

The cams are normally placed on a fixed camshaft which is then geared to the crankshaft, running at half crankshaft speed in a four-stroke engine.http://en.wikipedia.org/wiki/Four-stroke_cycle_engine_valves

Crankcase - Wikipedia, the free encyclopedia

Unlike four-stroke gasoline engines, the crankcase does not contain engine oil because it handles the fuel/air mixture. Instead, oil is mixed in with the fuel, and the mixture ... http://en.wikipedia.org/wiki/Crankcase
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crf 100 riding improvement (wheelie...

crf 100 riding improvement (wheelies, jumps, &wholeshots)this ME on my crf 100. i know, i am a bit big for the bike now. it is stock except for a billet exhaust tip and of course some stickers to junk it up. wheelies are comming along...Flash - Video

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FourStroke Bus - Sisters and BrothersFourStroke Bus plays Papa's Hideaway in Ketchum, Idaho. Special guest Ken Martin on guitar. Spring 2008Flash - Video

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Mercedes-Benz Championship R4 HighlightsTwo eagles in three holes on the back nine helped Soren Hansen to a four-stroke victory in the Mercedes-Benz Championship at Gut Lärchenhof.Windows Media - Video

2005 Baja Motorsports Baja Extreme ...

2005 Baja Motorsports Baja Extreme 300 Sport ATV Four Wheeler ...2005 Baja Motorsports Baja Extreme 300 Sport ATV - Approximately 50 Hours on this machine 292.5cc, four-stroke engine 21.5hp with electric ...Flash - Video

Answers for Four-stroke

Snoop112How is a four stroke engine driven through the intake, compression and exhaust strokes?Snoop112Jim is right. Imagine when you would get a merry-go-round going when you were a kid. You put your energy into the spinning part in pulses. The merry-go-round keeps going around even though you let...Lions28What is the difference between a four stroke motor and a two stroke motor?Lions28Two stroke engines have a power stroke on every revolution of the crankshaft. Four strokes have a power stroke on every other revolution of the crankshaft. Two strokes will probably be quieter, have...toolshed817What is the four stroke equivalent to a cr125r?toolshed817250F, won't have the snap, but you will have the torque!!!!!brian bwhat is the difference between a two stroke and a four stroke engine?brian bOn a two stroke engine the entire "combustion process" happens in one rotation of the engine. On a four stroke engine it takes two rotations of the engine to go through the entire combustion process....AnatoleHow to i find out if my Pocket Bike is two stroke or four Stroke?Anatoleeasiest way to tell the difference is by looking at the exhaust pipe. where the exhaust pipe comes out of the cylinder and wraps around back to a muffler / spark arrestor ... if the pipe is about...
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