Question

For which of the following engine lean-burn concept is ideal?

(a) CI engine

(b) SI engine

(c) Free piston engine

(d) Wankel engine

I had been asked this question by my school teacher while I was bunking the class.

This intriguing question originated from Nonconventional Engines topic in section Nonconventional Engines, Conventional Energy Sources & Cooling System of Automobile Engineering

Answer 1

The correct choice is (b) SI engine

The best I can explain: SI engines are more ideal for the lean-burn concept. A lean-burn mode is a way to reduce throttling losses. In SI engine, the power is reduced by partially closing a throttle.