Question 1
- (a) Explain the following processes that take place in the four-stroke petrol engine:
(i) induction stroke; (ii) compression stroke; (iii) power stroke.
(b) List two firing orders for a four-cylinder, four-stroke engine.
(c) Name four parts of a piston.
Observation
The attempts on 1(c) part of this question wasnotgood enough. Most candidates could not name the parts of a piston. The solutions to the poorly answered part of the question are given below
(c) Parts of a piston
- Combustion chamber
- Crown or piston crown
- Slot or heat barrier slot
- Lands or ring lands
- Ring grooves, piston ring groove(s) or ring belt
- Skirt or body
- Gudgeon pin bosses
- Circlip groove
- Gudgeon pin hole or piston pin hole