what is the difference between two strock engine and four strock bike engine?

Answer 1

Assuming you are asking the difference between 2 and 4 stroke engines, the difference is the number of strokes the piston makes to generate power. On four stroke engines the piston moves 4 times for one power stroke. Initially, the piston moves down with the intake valve open, drawing in a fuel air mixture. 2nd the piston moves up compressing the air/fuel mixture. The spark ignites the mixture drastically increasing pressure and enthalpy. This forces the piston down which is called the power stroke. Finally the piston moves up with the exhaust valve open pushing out exhaust gases. The process then repeats.

For 2 Stroke engines the exhaust gases are released at the end of the power stroke by a valve located farther down the piston chamber. The fuel air mixture is drawn in at the top of the piston chamber at the beginning of the power stroke.

Answer 2

A 2 strock has 2 strocks. A 4 strock has 4 strocks. More strocks does not mean more power. I have a 1 strock lawn trackturd that will out run most 2 strocks. Strocks are very expensive so you might want to start out with a zero strock.

Answer 3

Kdog has the right answer. There is one other basic difference between a 2 stroke engine and a four stroke engine. 4 Stroke engines burn only gasoline or diesel, depending on the type of engine, while 2 stroke engines burn a combination of oil and gasoline. Both have an oil reservoir to lubricate the internal parts of the engine. There is also an oil type additive mixed with gasoline on a 6 to 1 or 10 to 1 or some other ratio in the 2 stroke engine. The results of this burning of an oil and gas mixture, is that the exhaust fumes from a 2 stroke engine are more "smokey" than on a 4 stroke engine.

Answer 4

help is an idiot. There are so many different features that it would pay you to get a book or look at Wikipedia for the details. A quick description is the two stroke has less moving parts and relies upon oil in the fuel as lubrication. Four strokes are more complex and have a separate oil supply. Also from a cost point of view, two strokes tend to use more fuel as there is more wasted unburnt fuel lost to the exhaust. However two strokes tend to accelerate better as there are twice as many power strokes at the same rpm as a four stroke. Wikipedia will reveal all I would think.

Answer 5

what Kdog said. the only other thing to add is that a 2 stroke motor produces about 80% more horsepower at the same displacement than a 4 stroke. Thats why when they first came out in the supercross scene the 450 4 strokes were racing against 250 2 strokes.

Answer 6

On a 2 stroke;
the piston makes power on every downstroke, drawing air and fuel in on its way down and forcing out the exhaust on every up stroke.
2 strokes dont need mechanical valves to operate, instead most use whats called a reed valve, which is just a flap that lets air and fuel in.

On a four stroke;
the piston only makes power on every other down stroke.
on the first downstroke the piston draws air and fuel in.
compresses it on the up stroke, then gets it's spark and makes it's power downstroke. Finally it exhausts all the spent fuel and gases on the last upstrok. Then starts the whole cycle again.

4 strokes are more environmentally friendly and usually quieter. 4 strokes are usually a more durable engine, too.

Answer 7

Aside form the technical aspects in the previous answers, the 4 stroke has a wider, easier to use power delivery compared to a two stroke. Just for a reference a car or lawnmower is a 4 stroke and chainsaws are 2 stroke. You can tell the difference pretty easy by the sound.

Answer 8

Strock?

Are you asking about a 2-stroke engine as compared to a 4-stroke?

Answer 9

four strokes are boring and slow and usualy in the shop getting valve adjustments while the two strokes are out tearing up the tracks and trails, if you cant tell i am a two stroke fan, i think they are way more powerful and much more fun. like one answerer said, four strokes offer easier to use powerbands for slow crawling and stuff like that, but if you are an experienced rider then i say there is no better way to have fun then riding a 125 or 250 in the woods!!

Answer 10

4 Stroke:
1. Intake stroke (Intake valve open, Exhaust valve closed): Piston moves down draws in air and fuel mixture.
2. Compression stroke (intake valve closed, exhaust valve closed) Piston moves up to compress air fuel mixture.
3. Power stroke (intake valve closed, exhaust valve closed) Piston moves down with the force generated due to ignition of the air fuel mixture.
4. Exhaust stroke (intake valve closed, exhause valve open) Piston moves up to expell the by-products of the combustion.

Animation of a 4 stroke cycle:
http://www.howstuffworks.com/engine1.htm

For a 2 stroke, the processes are combined.
Typically.
1. As the piston is moving up, and Air/fuel mixture is added into the chamber as the piston compresses (Intake/compression stroke)
2. As the fuel is ignited the power stroke begins and exhaust gases are expelled. (power/exhaust stroke)

Here are some nice visual animation of a 2 stroke cycle:
http://science.howstuffworks.com/two-stroke2.htm


LOL kdog, didn't think I'd see the words increase enthalpy here. So and increase in delta h, boy that was too long ago. So during the power stroke is there an increase in entropy?