HOW THE ENGINE WORKS RK.

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Presentation transcript:

HOW THE ENGINE WORKS RK

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

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

CRANKSHAFT Changes Recipro-cating motion to Rotating motion RK

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

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

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

FOUR STROKE CYCLE Intake Compression Power Exhaust RK

IGNITION Spark Ignition (SI) Compression Ignition (CI) Gasoline Engines use a precisely timed electric spark to start the combustion process. 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.

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

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

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

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

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

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

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