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Reciprocating motion, used in reciprocating engines and other mechanisms, is back-and-forth motion. Each cycle of reciprocation consists of two opposite motions: there is a motion in one direction, and then a motion back in the opposite direction. Each of these is called a stroke. The term is also used to mean the length of the stroke.

In a steam locomotive, or in a steam, Otto or Diesel piston engine, a stroke is the action of a piston travelling the full length of its locomotive cylinder or engine cylinder in one direction.

The stroke length is determined by the cranks on the crankshaft. Stroke can also refer to the distance the piston travels. Engine displacement is dependent on both the diameter of the cylinder, known as its bore, and the stroke of the cylinder.

In a pistonless rotary engine, the term is applied to the corresponding rotor movement, see dead centre.

Four-stroke internal combustion engine[edit]

Main article: Four-stroke engine

Most modern internal combustion engines work on a four-stroke cycle; that is, a complete cylinder cycle consists of four discrete strokes, as described below. Other types of engines can have very different stroke cycles.

Induction stroke[edit]

The induction stroke is the first stroke in a four-stroke internal combustion engine cycle. It involves the downward movement of the piston, creating a partial vacuum that draws (allows atmospheric pressure to push) a fuel/air mixture into the combustion chamber.

In a reciprocating engine, it is that portion of the cycle when the pistons move from TDC (top dead center) to BDC (bottom dead center) and the fuel-air mixture is drawn into the cylinders....

Compression stroke[edit]

The compression stroke is the second of four stages in an otto cycle or diesel cycle internal combustion engine.

In this stage, the mixture (in the case of an Otto engine) or air (in the case of a Diesel engine) is compressed to the top of the cylinder by the piston until it is either ignited by a spark plug in an Otto engine or, in the case of a Diesel engine, reaches the point at which the injected fuel spontaneously combusts, forcing the piston back down.

Compression serves to increase the proportion of energy which can be extracted from the hot gas and should be optimised for a given application. Too high a compression can cause detonation, which is undesirable compared with a smooth, controlled burn. Too low a compression may result in the fuel/air mixture still burning when the piston reaches the bottom of the stroke and the exhaust valve opens.

\frac{T3}{T2}= \left(\frac{V2}{V3}\right)^{\gamma-1}

Solve for variable

Power stroke/expansion stroke[edit]

A power stroke is, in general, the stroke or movement of a cyclic motor while generating force and thus power. It is used in describing mechanical engines. This force is the result of the spark plug igniting the compressed fuel-air mixture.

Exhaust stroke[edit]

The exhaust stroke is the fourth of four stages in a four stroke internal combustion engine cycle. In this stage gases remaining in the cylinder from the fuel ignited during the compression step are removed from the cylinder through an exhaust valve at the top of the cylinder. The gases are forced up to the top of the cylinder as the piston rises and are pushed through the opening, which then closes to allow a fresh air/fuel mixture into the cylinder so the process can repeat itself.

See also[edit]


Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Stroke_(engine) — Please support Wikipedia.
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157 news items

 
The Missoulian
Mon, 01 Sep 2014 11:33:45 -0700

McIntyre – who drives a 2000 Ford F-250 with a 7.3-liter Power Stroke engine – added that it also comes down to being a more responsible driver. “Any one of our trucks, if we really wanted to, we could just stomp on it and make them do what all the ...
 
PR Web (press release)
Mon, 18 Aug 2014 07:48:45 -0700

Recreational boaters can trade in their old two-stroke engine in exchange for a ten percent discount towards the purchase of a new Honda four-stroke outboard engine. All old and inefficient two-stroke engines collected will be responsibly recycled ...
 
Midland Daily News
Tue, 05 Aug 2014 16:40:34 -0700

Summerhill Impact, in partnership with Honda Canada Inc. and supported by Environment Canada, are running the Clean Wake Program across Ontario until August 31, 2014. Recreational boaters can trade in their old two-stroke engine in exchange for a ten ...
 
Casper Star-Tribune Online
Sat, 23 Aug 2014 18:07:30 -0700

Responsible driving is key, said McIntyre, who drives a 2000 Ford F-250 with a 7.3-liter Power Stroke engine. "Any one of our trucks, if we really wanted to, we could just stomp on it and make them do what all the other trucks around town do," he said ...

Dallas Morning News

Dallas Morning News
Sat, 30 Aug 2014 08:45:00 -0700

Unlike motorcycles, mopeds have pedals, which are used to jump-start the two-stroke engine that emits a gassy smell reminiscent of lawn mowers. Most have top speeds around 20 mph, although tricked out, they can hit 60. But they're hardly sturdy. Mopeds ...
 
Aitkin Independent Age
Thu, 28 Aug 2014 04:37:30 -0700

He said a day's ride on his two-stroke engine costs about $25 for seven gallons of gas. Of course, a day's ride on Mille Lacs could cost a bit more after stopping at bars and resorts for food and drink. Zigo said he enjoys spending time traveling ...
 
TradeWinds
Fri, 29 Aug 2014 02:54:28 -0700

It had decided against a two-stroke engine system “given the additional risks that this will generate for the company.” John Fredriksen's Geveran Trading has recently built up a 16.1% holding in Flex, whose vessels are identified by analysts as the ...
 
The Republic
Thu, 28 Aug 2014 11:33:45 -0700

McIntyre — who drives a 2000 Ford F-250 with a 7.3-liter Power Stroke engine — added that it also comes down to being a more responsible driver. "Any one of our trucks, if we really wanted to, we could just stomp on it and make them do what all the ...
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