Four Stroke Cycle Theory by MikeJenny

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									Four Stroke Cycle Theory


          Roy S. Walls, Jr.
  Institute of Applied Agriculture
Intake Stroke
   piston moves from
    TDC to BDC
   partial vacuum
    created in cylinder
   intake valve opens
   exhaust valve stays
    closed
   air/fuel mixture
    enters cylinder
Compression Stroke
   intake valve closed
   exhaust valve closed
   air/fuel mix trapped
   piston travel is BDC to
    TDC
   air/fuel mixture is
    compressed
   ignition occurs near
    TDC
Power Stroke
                  air/fuel burns and
                   expands rapidly
                  .002 seconds to full
                   combustion pressure
                  both valves closed
                  piston travel is TDC to
                   BDC
                  great force applied to
                   top of piston
Exhaust Stroke
                    piston travel BDC to
                     TDC
                    exhaust valve opens
                    intake valve remains
                     closed
                    hot exhaust forced
                     past open exhaust
                     valve
End

								
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