Question

____________ losses are caused due to the leakage of combustion products past the piston from the cylinder into the crankcase.

(a) Pumping

(b) Blowby

(c) Pressure

(d) None of the mentioned

I got this question in class test.

Origin of the question is Total Engine Friction in portion Engine Friction and Lubrication of IC Engine

Answer 1

The correct answer is:

(b) Blowby

Blowby losses occur when combustion gases leak past the piston rings from the cylinder into the crankcase. This leakage reduces engine efficiency, as it leads to a loss of combustion pressure and contamination of the crankcase oil with combustion by-products.