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Topic: Two-stroke cycle

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Two-stroke cycle - Wikipedia, the free encyclopedia The simpler stroke in the fully valved diesel two-stroke cycle is the compression stroke; both valves are closed, and the rising piston compresses the air, heating it. The two-stroke cycle of an internal combustion engine differs from the more common four-stroke cycle by having only two strokes (linear movements of the piston) instead of four, although the same four operations (intake, compression, power, exhaust) still occur. The two stroke piston port type engines intake timing opens and closes before and after top dead center at the same crank angle making it symmetrical whereas the disk rotary valve allows the opening to begin earlier and close earlier. en.wikipedia.org /wiki/Two-stroke_cycle   (2712 words)

Four-stroke cycle - Wikipedia, the free encyclopedia The air-fuel mixture is then ignited, usually by a spark plug for a gasoline or Otto cycle engine, or by the heat and pressure of compression for a Diesel cycle of compression ignition engine, at approximately the top of the compression stroke. The four-stroke cycle (or Otto cycle) of an internal combustion engine is the cycle most commonly used for automotive and industrial purposes today (cars and trucks, generators, etc). Rod/stroke ratio is the ratio of the length of the connecting rod to the length of the crankshaft's stroke. en.wikipedia.org /wiki/Four-stroke_cycle   (2028 words)

Four-stroke cycle - Wikipedia, the free encyclopedia The air-fuel mixture is then ignited, usually by a spark plug for a gasoline or Otto cycle engine, or by the heat and pressure of compression for a Diesel cycle of compression ignition engine, at approximately the top of the compression stroke. The four-stroke cycle (or Otto cycle) of an internal combustion engine is the cycle most commonly used for automotive and industrial purposes today (cars and trucks, generators, etc). Rod/stroke ratio is the ratio of the length of the connecting rod to the length of the crankshaft's stroke. en.wikipedia.org /wiki/Four-stroke_cycle   (1976 words)

The marine diesel prime mover. - The two stroke plant The two stroke and four stroke titles refers to the mechanical action of the machinery, in particular the piston within the cylinder, to achieve the theoretical Carnot heat cycle, as define by the laws of thermodynamics. Two stroke engine have a wide variety of power output from the 353 Detroit Diesel with an output of less than 75 kW to a Sulzer RT-flex96C producing a 80,080 kW or about 109,000 bhp from fourteen cylinders turning at 102 rpm, not to be outdone MAN BandW has come out with the K108ME-C. The most prominent builders of large, slow speed, two stroke engine are Sulzer of Switzerland, producer of the first big two stroke design, and Burmeister and Wain (BandW) of Denmark, the pioneers of the engine’s application to ship design. www.dieselduck.ca /machinery_page/diesel_engine/diesel_engine.01.htm   (1471 words)

Four-stroke cycle internal combustion engine - Patent 5947068 In the subsequent compression stroke, the inlet valve cam 54 further rotates and the inlet valve 100 is closed by the restoring force of a compression spring 86. In the subsequent explosion stroke, the inlet valve 100 and the exhaust valve 102 are closed. A Further, in the exhaust stroke, a rocker arm 88 for the exhaust valve 102 is pushed upwardly by the exhaust valve cam 56 and pivotally rotates about a rocker shaft 90 whereby the exhaust valve 102 is pushed downwardly. www.freepatentsonline.com /5947068.html   (3493 words)

four-stroke cycle - Hutchinson encyclopedia article about four-stroke cycle The four stages are exactly the same as those of the four-stroke or Otto cycle. In a petrol engine the cycle begins with the induction of a fuel mixture as the piston goes down on its first stroke. The four-stroke cycle of a modern petrol engine. encyclopedia.farlex.com /four-stroke%20cycle   (269 words)

VIPRATECH::: The FOUR-STROKE CYCLE / OTTO CYCLE by ITC Leipzig VIPRATECH::: The FOUR-STROKE CYCLE / OTTO CYCLE by ITC Leipzig Nicolaus August Otto (Fig 1) the inventor of the four-stroke cycle was born on 14th June 1831 in Holzhausen (Germany). During the intake stroke the intake valve is opened and the piston moves toward the crank shaft. techni.tachemie.uni-leipzig.de /otto/otto_g0_eng.html   (658 words)

The marine diesel prime mover. - The four stroke plant The two stroke and four stroke titles refers to the mechanical action of the machinery, in particular the piston within the cylinder, to achieve the theoretical Carnot heat cycle, as define by the laws of thermodynamics. Four stroke engines are more complicated than the two stroke and "pack" less horsepower per pound. The four stroke is outwardly similar to it’s brother, the two stroke. www.dieselduck.ca /machinery_page/diesel_engine/diesel_engine.02.htm   (1262 words)

Talk:Four-stroke cycle - Wikipedia, the free encyclopedia The "four-stroke cycle" describes a particular operating concept for an internal combustion reciprocating piston engine; it is not a synonym for the Otto cycle (despite the fact that Otto's first engine was indeed a four-stroke). The Otto cycle is an idealized thermodynamic model of the processes taking place in a gasoline, spark-ignited engine; the title "four-stroke cycle" should be restricted to a page describing the details of operation of a real four-stroke piston engine (e.g. Heywood (and I) equate the Otto cycle to an ignition by spark, and NOT to a particular number of strokes. en.wikipedia.org /wiki/Talk:Four-stroke_cycle   (1681 words)

marinediesels.co.uk The Two Stroke Diesel Engine History and Introduction The two stroke cycle is so called because it takes two strokes of the piston to complete the processes needed to convert the energy in the fuel into work. The two stroke cycle can also be illustrated on a timing diagram. This design of two stroke is generally only used for the smaller lower powered 2 stroke engines - up to about 5000kW for a V16 engine with a 280mm bore and 320mm stroke. www.marinediesels.info /Basics/the_2_stroke_engine_explanation.htm   (715 words)

Small Gas Engines These factors make the two stroke cycle engine good for things like weed trimmers, chainsaws and lawnmowers where the operator could be tired out by a heavier machine or where the engine may be turned at steep angles or even operated in an up-side-down position. Since the two stroke cycle engine burns oil along with the gas, they pose a serious air pollution problem because of the large amounts of exhaust smoke they produce. A four-stroke cycle engine requires two revolution(s) of the crankshaft to complete all four strokes -- DOWN for the intake stroke -- UP for the compression stroke -- DOWN for the power stroke -- UP for the exhaust stroke. gaiser.vansd.org /tpaterek/yellqust/sge.htm   (5140 words)

internal combustion engine for power generation Two stroke engines lighter, simpler and less expensive to manufacture.They have a greater power to weight ratio.But they are lesser in efficiency and it require lubrication oil to be fed with fuel. The thermal efficiency of the working cycle of an engine characterizes the degree of perfection with which heat is converted in to work, without account taken of losses involved in friction, cooling, heat transfer, etc. This cycle accounts only for the heat lost with the exhaust gases. It is evident when investigating the cycle of internal combustion engine, only 40% or lesser amount of heat energy is converted in to useful work and the major part of energy is dissipated as losses. www.oengine.com /cengine.htm   (807 words)

Two-Stroke Principles This is necessary because a two-stroke engine completes a power cycle in only 360 degrees of crankshaft rotation, compared to a four-stroke engine, which requires 720 degrees of crankshaft rotation to complete one power cycle. If a two-stroke engine could retain the same percentage of air, they would be twice as powerful as a four-stroke engine because they produce twice as many power strokes in the same number of crankshaft revolutions. Although a two-stroke engine has fewer moving parts than a four-stroke engine, a two-stroke is a complex engine with different phases taking place in the crankcase and in the cylinder bore at the same time. www.eric-gorr.com /twostktech/2techbasicprincipals.htm   (533 words)

Suzuki GT750 - Two Stroke Cycle Towards the bottom of the stroke the transfer port is uncovered and the mixture pressure is equalized by entering the cylinder which is open to atmospheric pressure as the exhaust port is also uncovered. For a small part of the cycle the mixture is not compressed and some is lost through the partially open exhaust port. On the down stroke until the piston skirt closes the inlet some mixture is pushed back through the inlet port. www.thekettleclub.org.uk /2strokecycle/2stroke.htm   (846 words)

A two-stroke However, the two-stroke cycle can be difficult for some to visualize at first because certain phases of the cycle occur simultaneously, causing it to be hard to tell when one part of the cycle ends and another begins. A two-stroke in its purest form is extremely simple in construction and operation, as it only has three primary moving parts (the piston, connecting rod, and crankshaft). During the down stroke, the falling piston creates a positive pressure in the crankcase which causes the reed valve to close. www.southernskies.net /page_info/runningtwostrokeengine.html   (1167 words)

Animated Engines Two Stroke Cycle The two stroke engine employs the crankcase as well as the cylinder to achieve all the elements of the Otto cycle in only two strokes of the piston. Unfortunately most two stroke engines are inefficient and are terrible polluters due to the amount of unspent fuel that escapes through the exhaust port. During the downward stroke the poppet valve is forced closed by the increased crankcase pressure. www.keveney.com /twostroke.html   (283 words)

A History of Aeronautics - Chapter VI. Theoretically the two-stroke and the four-stroke cycle engines possess exactly the same thermal efficiency, but actually this is modified by a series of practical conditions which to some extent tend to neutralise the very strong case in favour of the two-stroke cycle engine. Another, the Roberts two-stroke cycle engine, yielded 100 brake horse-power from six cylinders of the stepped piston design; two carburettors, each supplying three cylinders, were fitted to this engine. The continuation of the outward stroke of the piston, after the exhaust ports have been closed, compresses the charge into the combustion chamber of the cylinder, and the ignition of the mixture produces a recurrence of the working stroke. www.worldwideschool.org /library/books/tech/engineering/AHistoryofAeronautics/chap39.html   (1629 words)

Camshaft - TheBestLinks.com - Crankshaft, Two-stroke cycle, Gear, Sleeve valve, ... In a four-stroke engine, the valves are opened only half as often; thus, two full rotations of the crankshaft occur for each rotation of the camshaft. In a two-stroke engine that uses a camshaft, each valve is opened once for each rotation of the crankshaft; in these engines, the camshaft rotates at the same rate as the crankshaft. Since the valves control the flow of fuel intake and exhaust, they must be opened and closed at the appropriate time during the stroke of the piston. www.thebestlinks.com /Camshaft.html   (411 words)

NMMA - TC-W3® TWO STROKE OIL CERTIFICATION PROGRAM Due to the nature of the two cycle marine engines, fuel is mixed with oil which then lubricates the engine parts as it passes through the engine during the combustion cycle. The long term objectives of the two cycle engine industry have been to reduce emissions which contain burnt and unburned oil that has passed through the engine, and to develop a quality of oil that reduces the mixture ratio to fuel while extending the life of the engine. This is in contrast to four cycle engines which have oil sumps and pumps for lubricating the engines, and the fuel is not pre mixed. www.nmma.org /certification/programs/oils   (385 words)

20241.980903&ELEMENT_SET=DECL They are also relatively inefficient mechanically since, at the two critical points in the conversion cycle, namely, piston top dead center and piston bottom dead center, the crank angle, and therefore the turning leverage of the piston rod on the crank of the crankshaft, are at a minimum. The power stroke is characterized by a rapid increase in the temperature and pressure of the gases which expansion forces the piston downwardly in the direction of its bottom dead center position. At the beginning of the exhaust stroke, the piston 36 is fully expanded in its cylinder 24 and the charge in the piston internal chamber 38 consists of spent or burnt gases. www.wipo.int /cgi-pct/guest/getbykey5?KEY=98/20241.980903&ELEMENT_SET=DECL   (8915 words)

four-stroke cycle In a petrol engine the cycle begins with the induction of a fuel mixture as the piston goes down on its first stroke. The four& cycle of a modern petrol engine. The ‘stroke’ is an upward or downward movement of a piston in a cylinder. www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0016503.html   (365 words)

LIM TECHNOLOGY These are the four-stroke cycle and the two-stroke cycle. The cycle comprises four-strokes and is often called "four cycle." In order to have four movements of the piston, (up twice and down twice), the crankshaft rotates twice. During the cycle, for every two rotations of the crankshaft, there is one rotation of the camshaft. www.limtechnology.com /Pages/basics.htm   (916 words)

Small Gas Engines These factors make the two stroke cycle engine good for things like weed trimmers, chainsaws and lawnmowers where the operator could be tired out by a heavier machine or where the engine may be turned at steep angles or even operated in an up-side-down position. A four-stroke cycle engine requires two revolution(s) of the crankshaft to complete all four strokes -- DOWN for the intake stroke -- UP for the compression stroke -- DOWN for the power stroke -- UP for the exhaust stroke. In the case of the four stroke cycle engine, the oil is in a bath located in the lower part of the engine. gaiser.vansd.org /tpaterek/yellqust/sge.htm   (5140 words)

Four stroke cycle 1 - Wikipedia, the free encyclopedia Look for Four stroke cycle 1 in the Commons, our repository for free images, music, sound, and video. Check for Four stroke cycle 1 in the deletion log, or visit its deletion vote page if it exists. Look for Four stroke cycle 1 in Wiktionary, our sister dictionary project. www.sciencedaily.com /encyclopedia/four_stroke_cycle_1   (171 words)

Lubricating device of four-stroke cycle engine unit for portable working machine - Patent 5176116 In comparison of such a two-stroke cycle engine unit with a four-stroke cycle engine unit, the latter engine unit generates noise lower than that of the former engine unit and generates relatively clean exhaust gas, and the latter engine unit is operated with a reduced fuel consumption. A lubricating device for a four-stroke cycle engine unit according to claim 1, wherein said oil escape preventing means comprises at least one of cylindrical parts projecting in the chambers, connected to the through hole of the push rods. A lubricating device for a four-stroke cycle engine unit according to claim 5, wherein one of the guide and the seal is provided in at least one of the valve chamber and the cam chamber. www.freepatentsonline.com /5176116.html   (4921 words)

Four-stroke cycle (from gasoline engine) --  Encyclopædia Britannica The four-stroke cycle is illustrated in Figure 1. The mixture is compressed as the piston ascends on the compression stroke with both valves closed. This process occurs within the engine and is part of the thermodynamic cycle of the... www.britannica.com /eb/article-47215   (784 words)

Animated Engines, Otto Four Stroke The four strokes of the cycle are intake, compression, power, and exhaust. Larger four stroke engines usually include more than one cylinder, have various arrangements for the camshaft (dual, overhead, etc.), sometimes feature fuel injection, turbochargers, multiple valves, etc. None of these enhancements changes the basic operation of the engine. The four stroke engine is probably the most common engine type nowadays. www.keveney.com /otto.html   (278 words)

A History of Aeronautics - Chapter VI. Theoretically the two-stroke and the four-stroke cycle engines possess exactly the same thermal efficiency, but actually this is modified by a series of practical conditions which to some extent tend to neutralise the very strong case in favour of the two-stroke cycle engine. Another, the Roberts two-stroke cycle engine, yielded 100 brake horse-power from six cylinders of the stepped piston design; two carburettors, each supplying three cylinders, were fitted to this engine. The continuation of the outward stroke of the piston, after the exhaust ports have been closed, compresses the charge into the combustion chamber of the cylinder, and the ignition of the mixture produces a recurrence of the working stroke. www.worldwideschool.org /library/books/tech/engineering/AHistoryofAeronautics/chap39.html   (1629 words)

10329.050203&ELEMENT_SET=DECL A compression piston is slidably received within a compression cylinder and operatively connected to the crankshaft such that the compression piston reciprocates through an intake stroke and a compression stroke of a four stroke cycle during a single rotation of the crankshaft. Accordingly, a four stroke cycle engine is defined herein to be an engine which requires four complete strokes of one of more pistons for every expansion (or power) stroke, i. More specifically, the present invention relates to a split-cycle engine having a pair of pistons in which one piston is used for the intake and compression stokes and another piston is used for the expansion (or power) and exhaust strokes, with each of the four strokes being completed in one revolution of the crankshaft. www.wipo.int /cgi-pct/guest/getbykey5?KEY=05/10329.050203&ELEMENT_SET=DECL   (9246 words)

Two-stroke cycle The simpler stroke in the fully valved two-stroke cycle is the compression stroke; both are closed and the rising piston compresses air heating it. The two-stroke cycle of an internal combustion engine differs from the more common four-stroke cycle by having only two strokes (linear of the piston) instead of four although same four operations (intake compression power exhaust) occur. At the top of stroke diesel fuel is injected into the cylinder where ignites and burns. www.freeglossary.com /Two_stroke_cycle   (1667 words)

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