Two-Cycle and Four-Cycle Engines

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Presentation transcript:

Two-Cycle and Four-Cycle Engines Chapter 5

Objectives Describe four-stroke cycle engine operation and explain the purpose of each stroke. Explain the concept of valve timing. Compare the lubrication system in a four-cycle engine to the system in a two-stroke engine. Describe two-stroke cycle engine operation and explain the principles of two-cycle operation. List the advantages and disadvantages of two-cycle and four-cycle engines.

Stroke Each time the piston moves from one end of its travel to the other (BDC to TDC and vice-versa). Strokes are identified by the job they do. Four-cycle engines require four strokes to complete one operating cycle. Two stroke engines require?-

Four- Stroke Cycle Engine Intake- Compression- Power- Exhaust-

Intake Intake Valve- Key Functions: 1. 2. 3.

Compression Valves- Piston Rings- Why does compression increase the force of combustion? 1. 2.

Power Valves- What happens? Top dead center (TDC)- Compression Ratio

Exhaust Valves- Scavenging- How does the valve cool?

Valve Timing Figure 5-5 in book. Valve Overlap- How are the valves timed?

Lubrication of a Four-Stroke Provided by placing the correct quantity and quality of oil in the crankcase. Pressurized System- Splash System- Can engine operate upside-down?

Lubrication of a Two-Stroke Can be operated at extreme angles…Why? Fuel Mixture- Advantages- Disadvantages-

Two-Stroke Design Two Basic Designs (Fig 5-8) Cross-scavenged-(Rotary and Reed Valves) Loop-scavenged-(3rd port design)

Principles of Operation Intake into Crankcase: Fuel Transfer: Ignition/Power Exhaust

Scavenging and Tuning How to get the exhaust out and keep the fuel in?

Different Valves Rotary Disc: Reed:

List at least 10 differences in the characteristics between 4 and 2 stroke engines.

Objectives Describe four-stroke cycle engine operation and explain the purpose of each stroke. Explain the concept of valve timing. Compare the lubrication system in a four-cycle engine to the system in a two-stroke engine. Describe two-stroke cycle engine operation and explain the principles of two-cycle operation. List the advantages and disadvantages of two-cycle and four-cycle engines.