Power Point Presentation Chapter 3 Engine Operation Engine

Power. Point® Presentation Chapter 3 Engine Operation Engine Components • Four-Stroke Cycle Engines • Two-Stroke Cycle Engines • Valving Systems • Diesel Engines • Rotary Engines • Engine Output

Chapter 3 — Engine Operation Competencies w w w 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.

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

Chapter 3 — Engine Operation Engine Blocks w cylinder block n n n cylinder bore cooling fins valve train components w crankcase

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

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

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

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

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

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

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

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

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

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

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

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

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

Chapter 3 — Engine Operation Chapter 3 Review What is the function of a crankshaft? n 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? n The five events of four-stroke cycle engines are intake, compression, ignition, power, and exhaust.