2401868563

Gas vapor

Exhaust valve    and air

open    mixture

To exhaust

pipę    Intake

valve

The piston moves up again to exhaust the burned gases.

Intake valve open

Exhaust

valve

A mixture of gasoline vapor and air enters the combustion chamber as the piston moves down.

Intake stroke

(D

The

:panding gas moves me iston down, stage called the power stroke.

Exhaust stroke (5)

Both valves closed

Spark pług A

Both valves closed

The piston then moves up, compressing the gas

for ignition.

Cylinder Piston

Connecting rod

Power stroke

(4)

Both valves closed

Crankshaft

Compression stroke

(2)

/

Figurę 20-2 Internal-

When the gas ignites, lt expands.

Ignition

(3)