The document describes the key components and functioning of internal combustion engines. It notes that Nikolaus Otto successfully developed the compressed charge internal combustion engine to run on petroleum gas. It then explains the four strokes of a four-stroke engine: the intake stroke, compression stroke, power stroke, and exhaust stroke. Each stroke involves the piston moving between top and bottom dead center and the opening and closing of inlet and exhaust valves. The document also provides a brief overview of how a two-stroke engine operates in two strokes rather than four.

1. ENGINE
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2. INTERNAL COMBUSTION ENGINE
• Nikolaus August Otto was a German engineer who successfully
developed the compressed charge internal combustion engine which
ran on petroleum gas
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3. Engine Stroke / Piston Stroke
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TDC
BDC

4. SUCTION STROKE
 PISTON
 INLET VALVE
 EXHAUST VALVE
 CRANKSHAFT
TDC BDC
OPEN
CLOSE
180˙ rotate
VOLUME PRESSURE
7/11/2019 created by H.M.M.L.Herath (CGTTI)

5. COMPRESSION STROKE
 PISTON BDC TDC
 INLET VALVE
CLOSE EXHAUST VALVE
CLOSE
VOLUME PRESSURE
 CRANKSHAFT 360˙ rotate
7/11/2019 created by H.M.M.L.Herath (CGTTI)

6. POWER STROKE
 PISTON
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BDCTDC
 INLET VALVE
 EXHAUST VALVE CLOSE
CLOSE
 CRANKSHAFT 540˙ rotate

7. EXHAUST STROKE
 PISTON
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BDC TDC
 INLET VALVE
 EXHAUST VALVE
CLOSE
OPEN
 CRANKSHAFT 720˙ rotate

8. FOUR-STROKE ENGINE
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9. FOUR-STROKE ENGINE
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10. TWO-STROKE
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11. Two-stroke Engine
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12. Two-stroke Engine
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 PISTON BDC TDC

13. Two-stroke Engine
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14. Two-stroke Engine
7/11/2019 created by H.M.M.L.Herath (CGTTI)