Types

Internal Combustion Engines External Combustion Engines

Internal Combustion-Basic Parts

Crankcase Crankshaft Piston Piston Rings Connecting Rod 4-Stroke Engine

Valvetrain○ Camshaft○ Valves

Crankcase

Main Structural component of the engine.

Piston Cylindrical part fitted in a cylinder Transmits power created by the combusting

fuel & air

Piston Rings

Seals the Piston to the Cylinder Wall

Connecting Rod

Links Crankshaft to Piston

Crankshaft

Converts the Linear motion of the piston to a Rotary motion.

4-Stroke Engine-Valvetrain Camshaft

Operates Valves

ValvesOpen and Close

Ports

Internal Combustion Engines 4-Stroke Gas 2-Stroke Gas

4-Stroke Gas Engines

4 Stroke / CycleIntake CompressionPower Exhaust

Intake Stroke

Piston moves down drawing in fuel and air.

4-Stroke Gas Engines - Intake

4-Stroke Gas Engines - Compression

• Piston moves up, squeezing the fuel and air

4-Stroke Gas Engines - Compression

4-Stroke Gas Engines - Power• Near Top Dead Center

spark ignites the fuel and air combusting the vapor forcing the piston down.

4-Stroke Gas Engines - Power

4-Stroke Gas Engines - Exhaust• Piston moves up

forcing out the spent gasses

4-Stroke Gas Engines - Exhaust

4-Stroke Gas Engines

4-Stroke In Action Pros

Easy to RefuelLight WeightInexpensive

ConsOnly 30% Efficient

2-Stroke Gas Engines

Completes the 4-cycles in 2-strokes

No Valvetrain Uses Transfer Ports

2-Stroke Gas Engines 2-Stroke in action Advantages:

Less Moving PartsLight WeightTwice as PowerfulOperating Position

Disadvantages:Frequent RebuildsPollutionBurns Oil

External Combustion Engines Steam Engines Rocket Engines

Steam Engines

Steam engines were the first engine type to see widespread use.

Used to pump water

Steam Engines

Rocket Engines

Rocket engines are reaction engines. Two Types

Solid FuelLiquid Fuel

Solid & Liquid Fuel

The End