Principles of Engine Operation, 2 & 4 Stroke Engines

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Presentation transcript:

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

Gasoline Must Be Atomized

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

Simple engine

Simple Engine Operation

Four-Stroke Engine

Four-Stroke Engine Intake Stroke

Four-Stroke Engine Exhaust Stroke

Four-Stroke Engine Compression

Four-Stroke Engine Power Stroke

Four-Stroke Engine Valve Timing

Four-Stroke Engine Lubrication

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

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

Two-Stroke Engine

Two-Stroke Engine

Two-Stroke Engine

Two-Stroke Engine

Two-Stroke Engine

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

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