Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
ISBN: 9781133612315



Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
ISBN: 9781133612315
Textbook Problem

Describe what takes place during the four strokes of a four-stroke cycle engine.

To determine

The functioning of a four strokes cycle engine during different strokes.


In an internal combustion engine, the piston performs four different strokes to complete one operating cycle. Each stroke consists of 180° of crankshaft rotation and hence a four-stroke cycle is completed through 720° of the crankshaft. The different strokes of the piston are intake, compression, power, and exhaust. The working principle of each stroke of an internal combustion engine is as follows:

  1. Intake:
  2. In this stroke, the piston is at the top dead center and is about to move downwards. During intake or suction stroke the inlet valve is opens and the exhaust valve remains closed. As the piston moves downwards, suction is created which allows an air-fuel mixture to be drawn into the cylinder. This stroke completes when the piston reached at bottom dead center.

  3. Compression:
  4. This stroke starts when the piston reaches the bottom dead center and completes at top dead center...

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