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Principles of Engine Operation, 2 & 4 Stroke Engines Chapter #5 23% of mowers are sold in May… 30% snow throwers are sold in December.

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Presentation on theme: "Principles of Engine Operation, 2 & 4 Stroke Engines Chapter #5 23% of mowers are sold in May… 30% snow throwers are sold in December."— Presentation transcript:

1 Principles of Engine Operation, 2 & 4 Stroke Engines Chapter #5 23% of mowers are sold in May… 30% snow throwers are sold in December

2 Gasoline Must Be Atomized

3 Combustion Force Must Be Contained Gas + oxygen + nitrogen in atmosphere + carbon dioxide = water + nitrogen to atmosphere (air-fuel mixture -> exhaust gases)

4 Simple engine

5 Simple Engine Operation

6 Four-Stroke Engine

7 Intake Stroke

8 Four-Stroke Engine Exhaust Stroke

9 Four-Stroke Engine Compression

10 Four-Stroke Engine Power Stroke

11 Four-Stroke Engine Valve Timing

12 Four-Stroke Engine Lubrication

13 Two-Stroke Engine Two Design Variations – Cross-scavenge – Loop-scavenge

14 Two-Stroke Engine Principle of Operation – Intake into the crankcase – Ignition-Power – Exhaust – Fuel transfer

15 Two-Stroke Engine

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20 2-Cycle Scavenging and Tuning When properly designed the exhaust system scavenges all the exhaust gases from the combustion chamber.

21 2 vs. 4 cycle Textbook page 106, figure 5-17

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