Page 99 - 05. Subyek Teknik Mesin - Automobile Mechanical and Electrical Systems Automotive Technology Vehicle Maintenance and Repair (Vehicle Maintenance Repr Nv2) by Tom Denton

2
Engine systems 83

Figure 2.4 Induction or intake: piston Figure 2.5 Compression: piston
moving down moving up

Figure 2.6 Power or combustion: piston is Figure 2.7 Exhaust: piston moving
forced down back up

Once the energy from the fuel has been used, the exhaust valve opens so that Key fact
the waste gases can leave the engine through the exhaust port. To complete the
The four-stroke cycle is sometimes
exhausting of the burnt gases the piston moves upward in the cylinder. This fi nal described as: suck, squeeze, bang,
stroke is called the exhaust stroke. blow ….
The four-stroke cycle then repeats over and over again, as the engine runs.
A heavy fl ywheel keeps the engine turning between power strokes.