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Four Stroke Cycle Theory
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Presentation Transcript
1. Four Stroke Cycle Theory Roy S. Walls, Jr.
Institute of Applied Agriculture
2. 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
3. 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
4. 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
5. Exhaust Stroke piston travel BDC to TDC
exhaust valve opens
intake valve remains closed
hot exhaust forced past open exhaust valve
6. End
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