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Understanding the Four-Stroke Engine Cycle: Operation and Functionality

The four-stroke engine cycle is a crucial operation in most automotive and diesel truck engines, designed under emission regulations. It consists of four distinct strokes: intake, compression, power, and exhaust. This cycle requires the piston to move four times (twice up and twice down) to complete one cycle, involving two complete crankshaft revolutions. Each stroke plays a vital role in the engine's function, from air intake to gas expulsion, yielding pressures ranging from vacuum to high psi levels. Understanding this cycle is essential for grasping modern engine technology.

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Understanding the Four-Stroke Engine Cycle: Operation and Functionality

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  1. Transportation Technology Engine Operation: 4 Stoke Cycle C. Stemmler 4 Four Stroke Engine

  2. 4 Stroke Cycle • “cycle” is considered to be a repetitive series of operations • 4 Stroke - requires the piston to move four times--up then down--four times to complete one cycle (two revolutions of the crankshaft) • most automotive & diesel truck engines are 4 stroke engines--due to emission laws

  3. Intake valve 4 Stroke Cycle -- Intake Stroke • Piston Direction down TDC to BDC • Intake Valve open • Exhaust valve closed • Movement of gasesenters cylinder • Pressure 14 hg. of vacuum

  4. Exhaust valve Compression Stroke • Piston Direction Up BDC to TDC • Intake Valve closed • Exhaust valve closed • Movement of gasessqueezed • Pressure 120 to 150 psi

  5. Power Stroke • Piston Direction Down TDC to BDC • Intake Valve closed • Exhaust valve closed • Movement of gasesrapid expansion • Pressure 800 to 1000psi

  6. Exhaust Stroke • Piston Direction Up BDC to TDC • Intake Valve closed • Exhaust valve open • Movement of gasesexpelled or pushed out • Pressure 20 to 30psi

  7. 4 Stroke Cycle - Complete • There are crankshaft revolutions in one cycle - which is degrees of crankshaft rotation rotation. two 720 180 • The crankshaft turns degrees during one stroke. once • The camshaft turns in one complete cycle - which is degrees of crankshaft rotation. 720

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