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How a Four Stroke Engine Works !

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  • How a Four Stroke Engine Works !

    For those newbies out there that was still learning about internal combustion engines, here is information on how a four-stroke engine works.

    The four stroke engine was first demonstrated by Nikolaus Otto in 1876, hence it is also known as the Otto cycle.
    The technically correct term is actually four stroke cycle.
    The four stroke engine is probably the most common engine type nowadays. It powers almost all cars and trucks.


    The four strokes of the cycle are intake, compression, power, and exhaust. Each corresponds to one full stroke of the piston, therefore the complete cycle requires two revolutions of the crankshaft to complete.

    Intake. During the intake stroke, the piston moves downward, drawing a fresh charge of vaporized fuel/air mixture.

    Compression. As the piston rises the poppet valve is forced shut by the increased cylinder pressure. Flywheel momentum drives the piston upward, compressing the fuel/air mixture

    Power. At the top of the compression stroke the spark plug fires, igniting the compressed fuel. As the fuel burns it expands, driving the piston downward.

    Exhaust. At the bottom of the power stroke, the exhaust valve is opened by the cam/lifter mechanism. The upward stroke of the piston drives the exhausted fuel out of the cylinder.

    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.




    2000 Stock GPRXP ~ 83.6 / 7900 rpm
    2006 Stock RXP ~ 67.7 mph
    2000 Stage II GP1200R ~ 76.7 / 7400 rpm (retired motor 2007 for conversion build)
    www.wfoperformance.net


    Pics ~Pics & Mods~ / Keep the 2-Strokes Alive !


    Buy your Performance Parts at @ www.4tecperformance.com


  • #2
    great graphic!

    I have a 14yro son who has a tendency to not care how things work. This is very helpful! You need to know this basic stuff to come up with at least an informed opinion as to what might be going on!
    Former and Founding Commodore of the South Florida Riders
    SoFla Riders - http://www.soflariders.net
    Seadoo GSX LTD - sold
    Kawasaki Ultra 250X - sold
    Look for a Green/Black Kawa 300 coming up in your rear view mirror soon!

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    • #3
      I have a 14yro son who has a tendency to not care how things work. This is very helpful! You need to know this basic stuff to come up with at least an informed opinion as to what might be going on!

      Right. Some people are more "visual" than others in their learning process and seeing something like this may help them fully understand how it actually works.
      2000 Stock GPRXP ~ 83.6 / 7900 rpm
      2006 Stock RXP ~ 67.7 mph
      2000 Stage II GP1200R ~ 76.7 / 7400 rpm (retired motor 2007 for conversion build)
      www.wfoperformance.net


      Pics ~Pics & Mods~ / Keep the 2-Strokes Alive !


      Buy your Performance Parts at @ www.4tecperformance.com

      Comment


      • #4
        suck squeez bang blow = four stroke hehe
        RXP 04 Riva grate.2*2 degree wedges.Riva intake. Twin Exhausts.15/19r 3blade.Rude Charger Pro block offs
        RR Intercooler with short pipework.Pro Nozzel.Riva Valve Train.Riva ECU 50Injectors.07 steering

        (MORNING JAMMER)

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        • #5
          4 stroke is easy, I'm still pretty lost on the 2 stroke, that is one of the reasons I own two 4 stroke skis.

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          • #6
            suck squeez bang blow
            2000 Stock GPRXP ~ 83.6 / 7900 rpm
            2006 Stock RXP ~ 67.7 mph
            2000 Stage II GP1200R ~ 76.7 / 7400 rpm (retired motor 2007 for conversion build)
            www.wfoperformance.net


            Pics ~Pics & Mods~ / Keep the 2-Strokes Alive !


            Buy your Performance Parts at @ www.4tecperformance.com

            Comment


            • #7
              How a Two Stroke Engine Works !

              For those newbies out there that was still learning about internal combustion engines, here is information on how a two-stroke engine works.

              The two-stroke engine consists of only three mobile parts: Piston, connecting rod and crankshaft

              The first two-stroke engine was a gas engine invented and built by Etienne Lenoir in 1860.
              A two-stroke diesel engine was built by Dugald Clark in 1878


              Mode of operation of the Two-Stroke engine

              1st Stroke
              At the point where the spark plug fires, fuel and air in the cylinder have been compressed, and when the spark plug fires the mixture ignites.
              The resulting forces drives the piston downward. As the piston moves downward, it is compressing the air/fuel mixture in the crankcase.
              As the piston approaches the bottom of its stroke, the exhaust port is uncovered. The pressure in the cylinder drives most of the exhaust gases (but not all) out of cylinder.


              note:
              As the piston finally bottoms out, the intake port is uncovered. The piston's movement has pressurized the mixture in the crankcase, so it rushes into the cylinder, displacing the remaining exhaust gases and filling the cylinder with a fresh charge of fuel.


              2nd stroke
              Now the momentum in the crankshaft starts driving the piston back toward the spark plug for the compression stroke.
              As the air/fuel mixture in the piston is compressed, a vacuum is created in the crankcase. This vacuum opens the reed valve and sucks air/fuel/oil in from the carburetor. Once the piston makes it to the end of the compression stroke, the spark plug fires again to repeat the cycle.








              2000 Stock GPRXP ~ 83.6 / 7900 rpm
              2006 Stock RXP ~ 67.7 mph
              2000 Stage II GP1200R ~ 76.7 / 7400 rpm (retired motor 2007 for conversion build)
              www.wfoperformance.net


              Pics ~Pics & Mods~ / Keep the 2-Strokes Alive !


              Buy your Performance Parts at @ www.4tecperformance.com

              Comment


              • #8
                951: Damn bro, that is freakin cool illustration!...PR...

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                • #9
                  951: and again, very cool illustration!...PR...

                  Comment


                  • #10
                    Here is another good link comprised by NASA

                    gases, equations, mathematics, pressure, temperature, volume, thermodynamics, energy, heat, work, thermodynamic cycle, Otto cycle, internal combustion engine, valves, pistons, stroke, 4-stroke engine, compression stroke, power stroke, intake stroke, exhaust stroke, combustion, heat rejection
                    2000 Stock GPRXP ~ 83.6 / 7900 rpm
                    2006 Stock RXP ~ 67.7 mph
                    2000 Stage II GP1200R ~ 76.7 / 7400 rpm (retired motor 2007 for conversion build)
                    www.wfoperformance.net


                    Pics ~Pics & Mods~ / Keep the 2-Strokes Alive !


                    Buy your Performance Parts at @ www.4tecperformance.com

                    Comment


                    • #11
                      how a 2-stroke works

                      Been wrenching my 2 and 4 stroke bikes, ski and cars for 30 years now. You have created the best illustrations I've seen. Good job, man!

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                      • #12
                        How a 2-stroke works

                        I've been wrenching my 2 and 4 stroke bikes, skis and cars for 30 years now. You have produced an excellent illustration here. This will be very helpful for people who are getting into engine maintenance on their 2-stroke skis.

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                        • #13
                          Very cool illustration!! Thanks Billy!
                          Brian

                          06 GTX LTD WITH WINGS

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                          • #14
                            This site has some cool stuff too. Check out this four cycle illustration:


                            It's the reason you can put the pedal to the metal and go from 0 to 60 in seconds. But to the uninitiated, an engine can look like a jumble of metal and wires.

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                            • #15
                              4-Tec Jetmate
                              2004 MSX 1500SC
                              T-45 GPRXP
                              1995 785 Three Seat Triple

                              Click Here>>>>>> Greenhulks Store
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