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HOW THE ENGINE WORKS RK. CYLINDER BLOCK n The cylinder block is the foundation to which all other components are attached. RK.

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Presentation on theme: "HOW THE ENGINE WORKS RK. CYLINDER BLOCK n The cylinder block is the foundation to which all other components are attached. RK."— Presentation transcript:

1 HOW THE ENGINE WORKS RK

2 CYLINDER BLOCK n The cylinder block is the foundation to which all other components are attached. RK

3 PISTON and ROD n Cast Piston n Forged Piston n Barrel Skirt n Slipper Skirt RK n Two compression rings n One oil ring

4 CRANKSHAFT n Changes Recipro- cating motion to Rotating motion RK

5 PISTON CONFIGURATIONS n Inline 6 n Inline 4 n Opposed 4 n V-6 n V-8 RK

6 OTHER ENGINE ID’S n Valve Train Type Flathead Overhead Valve (OHV) Overhead Cam (OHC) or (SOHC) Dual Overhead Cam (DOHC) n Engine Displacement Know conversion Factors From CI to CC CC to CI RK

7 DEFINITIONS n TDC Top Dead Center Piston at top of stroke. n BDC Bottom Dead Center Piston at Bottom of stroke. n STROKE TDC to BDC BDC to TDC 180 degrees of crankshaft rotation n FOUR CYCLE (Stroke) 4 x 180 = 720 degrees to make one complete cycle. RK

8 FOUR STROKE CYCLE n Intake Compression n Power n Exhaust RK

9 IGNITION n Spark Ignition (SI) Gasoline Engines use a precisely timed electric spark to start the combustion process. n Compression Ignition (CI) Diesel Engines use the heat produced from compression to raise cylinder temperature above the flash point of diesel, and inject fuel directly into the cylinder.

10 CAMSHAFTS n Camshafts turn at one half crankshaft speed. n Camshafts can be driven with a gear, chain and sprocket, or toothed belt. n Camshafts have one lobe for each valve. RK

11 INTAKE STROKE n Intake valve open n Exhaust valve closed n piston traveling down from TDC to BDC n Air is being force into the cylinder by the difference between atmospheric and cylinder pressure RK

12 VACUUM DEFINITION n Any pressure less than atmospheric in a sealed or semi-sealed container n Approximately 14.7 PSI at sea level RK

13 COMPRESSION STROKE n Both valves closed n Piston traveling up BDC to TDC n Compressing the air- fuel mixture RK

14 POWER STROKE n Both valves closed n Spark plug ignites the air fuel mixture n Piston is being pushed down by the expanding gases from TDC to BDC RK

15 EXHAUST STROKE n Exhaust valve open n Intake valve closed n Piston traveling up from BDC to TDC forcing the burnt exhaust gases from the cylinder RK

16 n At TDC the engine has returned to its starting point. RK


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