What is a stroke exactly? thanks!
2007-08-05 16:58:27 · 10 answers · asked by :) 1 in Cars & Transportation ➔ Motorcycles
The four strokes refer to intake, compression, combustion and exhaust strokes that occur in a four stroke engine.
1 Intake: the fuel and air are brought into the cylindar
2 Compression: the fuel-air mixture is compressed.
3 Combustion:this mixture is ignited by the spark plug to repel the cylindar back and thus giving the energy to drive the engine.
4 The Exhaust stroke: The resulting fumes are expelled on the cylindars return.
In a two stroke engine the strokes combine these mechanisms so that on all four of these can be combined into two strokes.
You may want to check this out too: http://science.howstuffworks.com/two-stroke1.htm
2007-08-05 17:20:15 · answer #1 · answered by Starlit_Eclipse 3 · 1⤊ 0⤋
The main difference is the 4 stroke has 4 movements, intake, compression, power, exhaust. This engine relies on a camshaft and valves. It takes 2 crank revolutions to make 1 unit of power. With a 2 stroke it is different. It relies on ports to take place of valves unless it is equipped with reed valves to stop any thing going back into the carburetor. The main function is it will draw fuel/air into the crankcase so oil must be mixed into the fuel is why they smoke. When It moves up it intakes air and compresses it. (intake/compression=up) when it goes down, the mixture lights and pushes the piston down and when it gets down far enough it will go out the exhaust port (power/ exhaust =down).It takes 1 revolution for 1 unit of power. 2 stroke engines used to be the norm for ungodly amounts of power up until the millennium when 4 stroke engines starting to make the power that the 2 stroke engines did. Also the government is trying to phase out 2 stroke engines because of the smoke and pollution they make. Also if anyone has had a 2 stroke engine you know they do not last. I have had to constantly tear down, re-ring or rebuild my old 2 stroke Husqvarna Dirtbikes. Thats about all I can think of.
2007-08-05 17:22:31 · answer #2 · answered by Dani&Morgan 5 · 1⤊ 0⤋
A 4 stroke engine fires once for every 4 movements or strokes of the piston. 1 intake, 2 compression. 3 power. 4 exhaust. A 2 stroke fires once for every 2 stokes. /the results are more power from a small 2 stroke engine, but they also tend to be dirtier and pollute more. (less efficient because they are combining strokes) A 2 stroke will require oil to be mixed with the gasoline. Some will mix it themselves others require you to mix it for them. 2 strokes will have grey smoke in the exhaust as they burn this oil.
2007-08-05 17:17:08 · answer #3 · answered by jimanddottaylor 7 · 1⤊ 0⤋
A 2 stroke means the piston in the engine makes 2 strokes (goes up/down) and then the spark plug fires. A 4 stroke means the piston in the engine makes 4 strokes (goes up/down) and then the spark plug fires. A 4 stroke is like a regular auto engine. A weedeater, small boatmotor, etc where you have to mix the gas and oil together is a 2 stroke. I hope this explains it.
2007-08-05 17:04:47 · answer #4 · answered by MIKEnJAPAN 5 · 2⤊ 0⤋
a 4 stroke engine is has less power,
but gains power as the engine gets hotter.
a 2 stroke has more power,
but loses power as the engine gets hotter.
a 4 stroke engine is a more fuel-efficient engine, and cleaner.
i would choose a 2 stroke for a dirt bike.
2007-08-05 19:56:13 · answer #5 · answered by arye 3 · 0⤊ 0⤋
4 stroke is more reliable but when it does brake down, (which will happen sometime!) it costs ALOT more to fix. Two stroke is a much simpler motor and can be fixed by your self if you are somewhat mechanically smart. In the long run it evens out price wise. Two strokes are alot more fun. The acceleration is tons of fun and the power band is awesome!
2016-04-01 00:59:50 · answer #6 · answered by Anonymous · 0⤊ 0⤋
A 2 STROKE SOUNDS LIKE A LAWNMOWER! Also it has more power for it's displacement, especially in low end grunt. You have to put oil into the gas tank when you fill it.Tthe parts for repair are typically more expensive.
2007-08-06 01:12:44 · answer #7 · answered by wordnerd27x 4 · 0⤊ 0⤋
Baiscally, 4 strokes sound like real bikes, and 2 strokes sound like weedeaters and blow smoke out their bloated exhausts.
2007-08-05 18:53:14 · answer #8 · answered by Anonymous · 0⤊ 0⤋
Seems most of these people have it right.. but the explanation just dosnt tell you what you want to know... go to these sites & have a read... tells you everything you want to know..
getting started section 4..(simple explanation)
http://www.dansmc.com/MC_repaircourse.htm
detailed explanation & animations...
http://www.carbibles.com/fuel_engine_bible.html
2007-08-05 17:43:23 · answer #9 · answered by Anonymous · 1⤊ 0⤋
About 60 mph.
2007-08-05 17:06:14 · answer #10 · answered by Anonymous · 0⤊ 1⤋