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Topic: Four-stroke cycle engine valves

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Marine Engines - Comparing Diesel Types: Two Cycle, Four Cycle The four cycle engine is aspirated through intake valves next to the exhaust valves; the DD engine has only exhaust valves, but twice as many of them. The operating system of the two cycle is radically different than the four cycle, which operates more like an ordinary gas engine without spark plugs. Two advantages of the DD fuel system is that it is considerably less sensitive to fouled fuel, plus the injectors are self-priming so that you don’t suffer the priming problems often encountered with 4 cycle engines. www.yachtsurvey.com /comparing_diesel_types.htm   (4980 words)

Had a Stroke Four-Stroke Cycle Diesel Engine The four-stroke diesel engine is similar to the four- stroke gasoline engine... The following will describe a four-stroke, normally aspirated, diesel engine having both intake and exhaust valves with... Diesel Engine, is among the front runners in manufacturing and exporting diesel gensets, four stroke diesel engine, diesel engine generator, diesel engine. www.hadastroke.com /stroke/different-stroke-season.html   (1260 words)

Small Gas Engines In the case of the four stroke cycle engine, the oil is in a bath located in the lower part of the engine. 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. Also, a problem that occurs with four stroke engines is something called "floating of the valves." This occurs when the engine speed reaches an RPM that is more than the engine can handle. gaiser.vansd.org /tpaterek/yellqust/sge.htm   (5140 words)

Fundamentals of Auto and Light Truck Mechanics In the two-stroke-cycle engine, all four events occur during two strokes of a piston and in one turn of the crankshaft. On the four-stroke-cycle engine, all four events occur during four strokes of a piston and two turns of the crankshaft. Because two-stroke-cycle compression-ignition engines have ONE power stroke for each turn, they produce twice as many power strokes as the four-stroke-cycle engine, and the flywheel can still be lighter. www.free-ed.net /sweethaven/MechTech/Automotive/Automotive02/lessonMain.asp?iNum=01020203   (823 words)

49997.010712&ELEMENT_SET=DECL The four stroke cycle internal combustion engine has been in use for the bulk of the 20th century. The reciprocating motion of the piston is not usually designed in a four stroke engine to pressurise the crankcase, though there have, in the past, been proposals to utilise the downward stroke of the piston to cause pressurisation of the crankcase to improve the efficiency of the engine. Most four stroke engines have reciprocating pistons, the crowns of which compress air/fuel mixture in a cylinder head for explosion and thus expansion. www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/49997.010712&ELEMENT_SET=DECL   (3502 words)

Fundamentals of Auto and Light Truck Mechanics On the four-stroke-cycle engine, all four events occur during four strokes of a piston and two turns of the crankshaft. In the two-stroke-cycle engine, all four events occur during two strokes of a piston and in one turn of the crankshaft. Because two-stroke-cycle compression-ignition engines have ONE power stroke for each turn, they produce twice as many power strokes as the four-stroke-cycle engine, and the flywheel can still be lighter. www.free-ed.net /sweethaven/MechTech/Automotive/Automotive02/lessonMain.asp?iNum=01020203   (823 words)

Two Stroke Cycle (Engine)-  Engineers Edge The following (links at bottom of page) will describe a two-stroke, supercharged, diesel engine having intake ports and exhaust valves with a 3.5-inch bore and 4-inch stroke with a 16:1 compression ratio, as it passes through one complete cycle. This means several events must occur during each stroke for all four events to be completed in two strokes, as opposed to the four-stroke engine where each stroke basically contains one event. But a two-stroke engine requires only two strokes of the piston to complete one full cycle. www.engineersedge.com /power_transmission/2_stroke_cycle.htm   (172 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)

Animated Engines, Otto Four Stroke 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 strokes of the cycle are intake, compression, power, and exhaust. The four stroke engine is probably the most common engine type nowadays. www.keveney.com /otto.html   (278 words)

The  Two-Stroke  Cycle stroke for all four events to be completed in two strokes, as opposed to the four-stroke engine requires only two strokes of the piston to complete one full cycle. having  intake  ports  and  exhaust  valves  with  a  3.5-inch  bore  and  4-inch  stroke  with  a  16:1 www.tpub.com /content/doe/h1018v1/css/h1018v1_45.htm   (354 words)

Caterpillar Diesel Engines -- Recommendations and Resources Scavenging (pushing the exhausted gas-charge out of the cylinder, and drawing in a fresh draught of air) of the engine is done either by ports or valves. This is known as the diesel cycle, after Rudolf Diesel, who invented it in 1892 and received the patent on February 23, 1893. The efficiency of the diesel engine over the gas engine is also because of the boundry layer effect of the fuel air mixture in the combustion chamber. becomingapediatrician.com /health/28/caterpillar-diesel-engines.html   (1226 words)

Two Stroke Cycle (Engine)-  Engineers Edge The following (links at bottom of page) will describe a two-stroke, supercharged, diesel engine having intake ports and exhaust valves with a 3.5-inch bore and 4-inch stroke with a 16:1 compression ratio, as it passes through one complete cycle. This means several events must occur during each stroke for all four events to be completed in two strokes, as opposed to the four-stroke engine where each stroke basically contains one event. But a two-stroke engine requires only two strokes of the piston to complete one full cycle. www.engineersedge.com /power_transmission/2_stroke_cycle.htm   (172 words)

Howstuffworks "How Diesel Two-Stroke Engines Work" The two-stroke engine article also explains that the gasoline engine cycle, where gas and air are mixed and compressed together, is not really a perfect match for the two-stroke approach. At the top of the cylinder are typically two or four exhaust valves that all open at the same time. On the other hand, a diesel two-stroke engine must have a turbocharger or a supercharger, and this means that you will never find a diesel two-stroke on a chain saw -- it would simply be too expensive. auto.howstuffworks.com /diesel-two-stroke1.htm   (537 words)

Fundamentals of Auto and Light Truck Mechanics The two- and four-stroke-cycle engines differ because the two-stroke cycle uses ports in the cylinder wall in lieu of valves. Another method of engine operation is the two-stroke cycle. The cycle is repeated again and again as the engine continues to run under its own power. www.free-ed.net /sweethaven/MechTech/Automotive/Automotive02/lessonMain.asp?iNum=01010106   (593 words)

Essays Page "Four stroke" refers to the four strokes made by the piston in the course of one cycle of the engine's operation. Although the basic four-stroke cycle remained, power and efficiency were greatly enhanced by design features like overhead valves, higher compression ratios, and balanced crankshafts, along with vastly improved ancillaries such as carburetors and ignition systems. Lenoir's engine used a two-stroke cycle and was double-acting; a mixture of air and illuminating gas entered while the piston was beginning to move away from the end of the cylinder. www.fofweb.com /Subscription/Science/Helicon.asp?SID=2&iPin=ffests0300   (1698 words)

Two-stroke cycle - Wikipedia, the free encyclopedia 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 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 design types of the two-stroke cycle engine vary according to the method of intake of fresh air/fuel mixture from the outside, the method of scavenging the cylinder (exchanging burnt exhaust for fresh mixture) and the method of exhausting the cylinder. en.wikipedia.org /wiki/Two_stroke_engine   (2167 words)

Two cycle diesel engine - Patent 4430967 The capacity of the compressor is optionally increased and the engine stroke somewhat lengthened by use of an offset shaft for each cylinder of the engine. In this operation, as when performing as a diesel, all the available air is drawn in without restriction, the speed and power of the engine determined by the fuel charge. As soon as the eccentric piston begins to lift the U-box on the upward compression stroke the sides of the U-box re-cover the horizontal exhaust ports and the tips of the U-box sides re-enter their channels closing off ports 32, sealing the combustion-expansion chamber to catch the next charge of compressed air. www.freepatentsonline.com /4430967.html   (2267 words)

Diesel Engine It turns out that the diesel approach, which compresses only air and then injects the fuel directly into the compressed air, is a much better match with the two-stroke cycle. Getting the mist circulated in the cylinder so that it is evenly distributed is also a problem, so some diesel engines employ special induction valves, pre-combustion chambers or other devices to swirl the air in the combustion chamber or otherwise improve the ignition and combustion process. At the top of the cylinder are typically two or four exhaust valves that all open at the same time. succ.shirazu.ac.ir /~motor/engin/desl.htm   (1478 words)

Two-stroke cycle - Wikipedia, the free encyclopedia 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 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 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)

Two-stroke cycle - Wikipedia, the free encyclopedia 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 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. Two-stroke engines have several marked disadvantages that have largely precluded their use in automobiles (although there was some use, such as in historic Saabs and DKWs and until recently in several automobiles produced in the Eastern bloc, including Trabants and Wartburgs, among others) and are reducing their prevalence in the above applications. en.wikipedia.org /wiki/two-stroke_cycle   (2167 words)

What's the difference between a 2-stroke engine and a 4-stroke engine? : Motorcycles information from Answerbag The working mechanism of the four-stroke Otto-Cycle: The engine's cylinder has got two valves, the intake valve and the exhaust valve, which are opened and closed by a camshaft mechanism. The most common is the four-stroke Otto Engine, which was invented by the German merchant and engineer Nikolaus August Otto in 1876. -1st stroke (Intake): The piston sucks in the fuel-air-mixture from the carburetor into the cylinder. www.answerbag.com /q_view.php/4137   (316 words)

Two Stroke Cycle (Engine)-  Engineers Edge The following (links at bottom of page) will describe a two-stroke, supercharged, diesel engine having intake ports and exhaust valves with a 3.5-inch bore and 4-inch stroke with a 16:1 compression ratio, as it passes through one complete cycle. This means several events must occur during each stroke for all four events to be completed in two strokes, as opposed to the four-stroke engine where each stroke basically contains one event. But a two-stroke engine requires only two strokes of the piston to complete one full cycle. www.engineersedge.com /power_transmission/2_stroke_cycle.htm   (172 words)

Four-stroke Combustion Engine The working mechanism of the four-stroke Otto-Cycle: The engine's cylinder has got two valves, the Intake valve I and the Exhaust valve E, which are opened and closed by a mechanism (camshaft- not shown here). The most common is the four-stroke Otto Engine, which was invented by the German merchant and engineer Nikolaus August Otto in 1876. The operation of the engine is divided into 4 parts, which are called strokes: www.k-wz.de /vmotor/v_omotore.html   (241 words)

Animated Engines, Otto Four Stroke 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 strokes of the cycle are intake, compression, power, and exhaust. The illustrated engine features a 'poppet' intake valve which is drawn open by the vacuum produced by the intake stroke. www.keveney.com /otto.html   (278 words)

Internal combustion engine, the prototype design of oscillator engine Oscillations generated, due to thermal cycle with this arrangement conveyed to the oscillations converter coupled by the oscillating shaft. Intake ports and exhaust ports are operated by valves from overhead cam shafts. Internal combustion engine, the prototype design of oscillator engine www.oengine.com /prototype.htm   (544 words)

Mastertech Outboard Boat Motor Repair, Marine 4 STROKE Engine Technology Explained Four strokes are more complex as well as generally much heavier as a result of additional parts EG camshaft, valve train, balance shafts etc. required to complete The power cycle. Each 4 stroke image depicts a piston in a cylinder, a spark plug and 2 valves; one intake, one exhaust. A stroke is the movement of the piston in one direction, moving the piston from the top to the bottom of the cylinder is one stroke. www.maxrules.com /fixtheory1.html   (748 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)

Four Stroke Diesel Engine Cycle -  Engineers Edge The following will describe a four-stroke, normally aspirated, diesel engine having both intake and exhaust valves with a 3.5-inch bore and 4-inch stroke with a 16:1 compression ratio, as it passes through one complete cycle. In a four-stroke engine the camshaft is geared so that it rotates at half the speed of the crankshaft (1:2). All the timing marks given are generic and will vary from engine to engine. www.engineersedge.com /power_transmission/four_stroke_cycle.htm   (113 words)

Internal combustion engine, the prototype design of oscillator engine Oscillations generated, due to thermal cycle with this arrangement conveyed to the oscillations converter coupled by the oscillating shaft. Intake ports and exhaust ports are operated by valves from overhead cam shafts. Internal combustion engine, the prototype design of oscillator engine www.oengine.com /prototype.htm   (544 words)

Diesel Engine Power Stroke Diesel Cycle -  Engineers Edge Diesel Engine Power Stroke Diesel Cycle - Engineers Edge the force on the crankshaft for the power stroke as Both valves are closed, and the fresh air charge has www.engineersedge.com /power_transmission/power_stroke.htm   (126 words)

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