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PowerPoint ® Presentation Chapter 3 Engine Operation Engine Components Four-Stroke Cycle Engines Two-Stroke Cycle Engines Valving Systems Diesel Engines.

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Presentation on theme: "PowerPoint ® Presentation Chapter 3 Engine Operation Engine Components Four-Stroke Cycle Engines Two-Stroke Cycle Engines Valving Systems Diesel Engines."— Presentation transcript:

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2 PowerPoint ® Presentation Chapter 3 Engine Operation Engine Components Four-Stroke Cycle Engines Two-Stroke Cycle Engines Valving Systems Diesel Engines Rotary Engines Engine Output

3 Chapter 3 — Engine Operation Competencies  List the components of an engine block.  Describe a cylinder head.  Explain the operation and components of a crankshaft.  Describe pistons and piston rings.  Explain the function of connecting rods and bearings.

4 Chapter 3 — Engine Operation Competencies  Describe the flywheel and valve train.  Compare the operation of four-stroke cycle and two- stroke cycle engines.  Describe valving systems.  Explain important features of diesel engines.  Explain measurement of engine output.

5 Chapter 3 — Engine Operation Engine Blocks  cylinder block cylinder bore cylinder bore cooling fins cooling fins valve train components valve train components  crankcase

6 Chapter 3 — Engine Operation Cylinder Heads  engine component fastened to the end of the cylinder block farthest from the crankshaft  head gasket is filler material

7 Chapter 3 — Engine Operation Crankshafts  convert linear motion of pistons to rotary motion  crankpin journal  bearing journal  counterweight  crankgear

8 Chapter 3 — Engine Operation Pistons  slide back and forth in the cylinder bore  piston pin  skirt  ring groove  piston ring

9 Chapter 3 — Engine Operation Connecting Rods and Bearings  connecting rod transfers motion from piston to crankshaft  bearings reduce friction, maintain clearance

10 Chapter 3 — Engine Operation Flywheels and Valve Trains  a flywheel is a disk mounted at one end of a crankshaft provides inertia for the engine provides inertia for the engine maintains crankshaft rotation between combustion intervals maintains crankshaft rotation between combustion intervals  a valve train controls the flow of gases into and out of the combustion chamber

11 Chapter 3 — Engine Operation Engine Operation  intake event introduces air and fuel (or just air in a diesel engine) to the combustion chamber introduces air and fuel (or just air in a diesel engine) to the combustion chamber piston moves from TCD to BDC piston moves from TCD to BDC  compression event air and fuel (or just air in a diesel engine) in combustion chamber is compressed in the cylinder air and fuel (or just air in a diesel engine) in combustion chamber is compressed in the cylinder

12 Chapter 3 — Engine Operation Engine Operation  ignition (combustion) event charge is ignited and rapidly oxidized to release energy charge is ignited and rapidly oxidized to release energy  power event expanding gases force the piston head away from the cylinder head expanding gases force the piston head away from the cylinder head

13 Chapter 3 — Engine Operation Engine Operation  exhaust event spent gases are removed from the chamber and released to atmosphere spent gases are removed from the chamber and released to atmosphere  valve overlap is the point when both intake and exhaust valves are open

14 Chapter 3 — Engine Operation Valving Systems  seal the combustion chamber to control flow of air-fuel mixture into the cylinder and exhaust gases out of the cylinder  commonly two valves per system, intake and exhaust  location of valve determines type of head design

15 Chapter 3 — Engine Operation Diesel Engines  injector is hydraulically activated by pressurized fuel delivered by the injection pump  heat in glow plug is created by resistance to current in a heating coil

16 Chapter 3 — Engine Operation Diesel Engines  five events in operation intake intake compression compression ignition ignition power power exhaust exhaust  turbocharging uses a compressor

17 Chapter 3 — Engine Operation Engine Output  measured by torque and horsepower  units of measurement of horsepower brake, friction, and indicated horsepower brake, friction, and indicated horsepower  dynamometer measures torque, load, speed, and horsepower

18 Chapter 3 — Engine Operation Engine Output  factors affecting engine output displacement displacement volumetric efficiency volumetric efficiency thermal efficiency thermal efficiency air density air density

19 Chapter 3 — Engine Operation Chapter 3 Review What is the function of a crankshaft? A crankshaft is an engine component that converts the linear (reciprocating) motion of the piston into rotary motion. A crankshaft is an engine component that converts the linear (reciprocating) motion of the piston into rotary motion. What are the five events of four-stroke cycle engines? The five events of four-stroke cycle engines are intake, compression, ignition, power, and exhaust. The five events of four-stroke cycle engines are intake, compression, ignition, power, and exhaust.


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