... when that occurs the piston heads towards the bottom of the cylinder and then starts to rise to the top. The third stroke is the power stroke and as the piston rises to the top it goes to the highest possible point in the cylinder and when it is at that point the gas and air mixture ... the spark plug administers a spark which then ignites the gas and air mixture and forces the engine down in the cylinder and turns the cranks shaft. The fourth stroke is the exhaust stroke then as the piston rises to the top of the cylinder the exhaust valve open and the exploded are released into the a...

• Word Count: 511
• Approx Pages: 2
• Grade Level: Undergraduate

... boomed. Four strokes are the alternative to a two stroke. Four strokes make the combustion process 4 steps instead of two. First, fuel is drawn in, just like a two stroke. As the piston moves up, it compresses the fuel. At this point, the engines show their differences. The four stroke will combust the mixture, making the power stroke, then the piston will come back up, making the ... gases travel outward. The two stroke just pushes the gases out and comes back for more. The ... four stroke has two rotations of the crank for every 1 power stoke. Four strokes have a sump oil system, whi...

• Word Count: 601
• Approx Pages: 2
• Grade Level: High School

... because if one of the four stages are left out, combustion will be unsuccessful. The first of the four strokes is the intake stroke. This occurs whenever the piston draws fresh air into the combustion area from the open valves. As the crankshaft turns the connecting rod ... explosion. The force pushes the piston to the bottom of the stroke, spinning the crankshaft very quickly, and the power is made to propel the vehicle. The piston then begins is journey to the peak of its next stroke, forcing out all of the exhaust fumes created by the explosion. ... of a vehicle's engine is just as i...

• Word Count: 1232
• Approx Pages: 5
• Has Bibliography
• Grade Level: High School

... certain state in response to a stimulus). It can all be shown in the diagram below of the Otto cycle.  (1-2) Isentropic compression (Compression Stroke)  (2-3) Constant volume, reversible heat addition (Ignition)  (3-4) Isentropic expansion (Power Stroke)  (4-1) Reversible, constant volume heat rejection (Exhaust) You will see that a mixture of fuel and air are pulled into a cylinder during the ... intake stroke. The pressure and temperature are then raised during the compression stroke while the volume decreases, staying true to the Combined Gas Law. Near maximum ... tempe...

• Word Count: 773
• Approx Pages: 3

... travel (bottom dead center) the correct amount of gas and air has been drawn in. At this point the valve closes and it is now ready for compression. The compression stroke is when the piston goes from bottom dead center and moves up to compress the air and gas mixture. This causes the mixture to become more flammable and thus give ... think this is not an explosion, this is rather a very hot and very powerful burn. This burn causes the gas to expand forcing to piston down. When this happens the power from the burn transfers to the crank shaft which is connected to the transmission, thus...

• Word Count: 496
• Approx Pages: 2
• Grade Level: High School