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In a 4-stroke engine, the steps (strokes) are:
- Intake stroke: During the intake stroke, the piston goes down from the top of the cylinder to the bottom, reducing the pressure inside the cylinder. It then draws a mixture of fuel and air into the cylinder through the intake port, ready for the compression stroke.
- Compression stroke: With both intake and exhaust valves closed, the piston goes back up to the top of the cylinder compressing the fuel-air mixture. This is what happens during the compression stroke.
- Power stroke: The compressed air-fuel mixture is then ignited by a spark. The pressure from the fuel-air mixture combustion drives the piston back down with humongous force, keeping the crankshaft turning. This is the power stroke phase, which is the main source of the engine's torque and power.
- Exhaust stroke: Finally, during the exhaust stroke, the piston again goes up and pushes the burned gas from the cylinder out the exhaust valve.
Unlike the four stroke one, a two stroke engine has three strokes combined into one action, meaning the intake and exhaust are both integrated into the compression movement of the piston, therefore eliminating the need for valves. This is thanks to an inlet and exhaust port integrated into the wall of the combustion chamber.
As the piston goes down from combustion, spent gasses are allowed to exit the chamber through the exhaust port. The air-fuel mixture is drawn through an inlet located lower in the chamber. As the piston rises again, it blocks off the inlet and exhaust ports, compressing the gasses at the top of the chamber. The spark plug fires and the process starts over.
The spark plug fires on every revolution.
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A two stroke engine can produce twice the amount of power (and makes twice as much noise) than a four stroke engine of the same size. This is because it fires once every revolution, giving it twice the power of a four stroke, which only fires once every other revolution. Significantly, it also has a higher weight-to-power ratio because it is much lighter.
Two stroke engines are simpler and cheaper to manufacture compared to four stroke engines because of their simpler design. Four stroke engines are longer lasting than two stroke engines that don't have a dedicated lubricating system. However, the spark plugs in a two stroke engine last longer than those in a four stroke engine.
Four stroke engines are more fuel efficient and environmentally friendly when compared to two stroke engines that also create an unpleasant smell. Two stroke engines are responsible for much more pollution due to the combustion of the oil that has to be added to the fuel to lubricate the piston.
What else can I help you with?
What is the difference between two stroke and four stroke engines in two wheelers?
The difference between 2stroke engines and 4-stroke engines are pretty much the same regardless of where the engine is used. To read about it, check out the related question below.
What is the difference between a 2 stroke and a 4 stroke lawn mower engine?
Four-stroke engines have a spout where you add oil to the engine. On two-stroke engines, oil has to be added to the fuel. (Four-stroke and two-stroke are also called four-cycle and two-cycle, respectively).
What is the difference between Two and Four Stroke IC engine.Thermodynamically?
There is no thermodynamic difference between them .
Difference between the events of four stroke petrol engine and that of a diesel engine?
Diesel engines are still 4-stroke (unless and early Detroit engine which were 2-stroke) only real difference between gas and diesel is fuel delivery and ignition.diesel uses high compression,fuel atomization and heat to fire cylinder,where gas engines need a ignition source.hope info was helpfull.
How can YOU identify a two stroke or four stroke engine by seeing it?
if you see the difference between valves
Are the tug boat engines are two stroke or four stroke?
All tug boat engines are four stroke engines, because this engine responces quickly in relation to maneuvering this kind of boat in any situation.
Is a 140cc engine a 2 or 4stroke?
The displacement of an engine, such as 140cc, does not inherently determine whether it is a two-stroke or four-stroke engine. Both types of engines can have a 140cc displacement. The main difference lies in their operation: two-stroke engines complete a power cycle in two strokes of the piston, while four-stroke engines complete it in four strokes. Thus, you would need additional information to identify the specific type of engine.
Are gasoline engines are -stroke engines?
Most gasoline engines are four stroke engines which is also known as the Otto Cycle. 1) Intake 2) Compresson 3) Ignition 4) Exhaust (four strokes)
What is the difference between four stroke and four cycle motor oil?
Four-stroke and four-cycle motor oil refer to the same type of oil designed for four-stroke engines, which complete a power cycle in four strokes of the piston. The term "four-cycle" is often used interchangeably with "four-stroke," but "four-stroke" is the more commonly accepted terminology. Both types of oil provide lubrication, cooling, and cleaning for the engine components. It’s important to choose the right oil based on the manufacturer's specifications, as the viscosity and additives may vary.
Most gasoline engines are what stroke engines?
Most gasoline engines are four stroke engines which is also known as the Otto Cycle. 1) Intake 2) Compresson 3) Ignition 4) Exhaust (four strokes)
Are kawasaki motorcyles two stroke or four stroke?
Assuming you are referring to a street legal motorcycle (IE: Kawaski Vulcan, Ninja, etc.) these machines have four stroke engines. Dirt Bikes and such sometimes do not. Two-stroke engines generally use a fuel+oil mixture. (Such as a weed whacker) Four stroke engines generally have an oil sump. (Like a car)
Why 2 stroke diesel engines are not used in two wheelers?
Two stroke engines will create a lot of visible smoke pollution and also more noise than four stroke engines. For these reason, many countries have required that all new motorcycles should be four-stroke.
