Question

The main advantage of using aluminium alloy for cylinder head is ____________

(a) lightness in weight

(b) high thermal conductivity

(c) less corrosion rate

(d) cost

I have been asked this question in quiz.

My question is from Cylinder Head in chapter Engine Construction & Wheel Assembly of Automobile Engineering

Answer 1

Right choice is (b) high thermal conductivity

To explain: Generally cylinder heads are coated with grey cast iron and aluminium alloy. The main advantage for the aluminium alloy over the cast iron is high thermal conductivity which can withstand about 1000°C without much expansion and deformation.