Two & Four Cycle Engines page 77 Questions on pg 90

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Presentation transcript:

Two & Four Cycle Engines page 77 Questions on pg 90 Chapter 5 Two & Four Cycle Engines page 77 Questions on pg 90

Small Engine Identification # of strokes for a cycle 2 4 rotary

Four Stroke Cycle Engine Intake Compression Power Exhaust

Intake Intake open Exhaust closed Piston moves downward Vacuum

Compression Both valves closed Piston moves up Compression 9:1

Power Both valves closed Spark Ignites air/fuel mixture 14.7:1 Piston forced down

Exhaust Exhaust valve opens Intake valve closed Piston moves up Pushes exhaust out

Valve Timing Valves must open and close at correct time Align marks Backfire Lack power

Lubrication Splash Pressure Hybrid

Two Stroke Cycle Engine See: http://science.howstuffworks.com/two-stroke2.htm

Variation in Design Cross-scavenged Loop-scavenged Contoured piston head Deflect air upward Reed valves/rotary valves Loop-scavenged Flat or domed piston Intake offset for exhaust

Principles of Operation Location of parts essential

Intake into Crankcase Piston moves up Causes vacuum Reed/rotary valve opens

Fuel Transfer Piston moves down Pressurizes crankcase Transfer port Intake port uncovered Air/fuel rush in

Ignition Power Air/fuel compressed 8:1 compression TDC-spark BTDC-advance (warm)

Exhaust Exhaust port exposed Intake pressure in forces exhaust out

Scavenging & Tuning Proper design Full scavenging

Rotary Disc Valve Engine Intake in crankcase No reed valve better fuel transfer

Reed Valve Engine Intake directly into crankcase Flexible spring steel Reed stop Limits valve opening Reed opened by atmospheric pressure Closed seals crankcase

4 Cycle VS 2 Cycle 4 cycle More power More fuel efficient No-premix Simple design Smaller lighter Runs at any angle High speeds