Question

When the spark advance is same as the optimum value the heat rejected to cooling system is increased.

(a) True

(b) False

I have been asked this question in exam.

Enquiry is from Engine Heat Transfer topic in division Heat Rejection and Cooling of IC Engine

Answer 1

The correct answer is:

(b) False

When the spark advance is set to its optimum value, the combustion process is more efficient, meaning it occurs at the ideal timing to extract maximum energy from the fuel. As a result, less heat is wasted, and less heat is rejected to the cooling system. If the spark advance is not optimal, combustion may be less efficient, leading to more heat being produced and rejected to the cooling system. So, with optimum spark advance, the heat rejected to the cooling system is typically reduced.