Question

Blow by losses vary as the square root of inlet pressure, and increases as the compression ratio are ____________

(a) increased

(b) reduced

(c) unpredictable

(d) none of the mentioned

The question was posed to me in a job interview.

I'd like to ask this question from Engine Friction topic in division Engine Friction and Lubrication of IC Engine

Answer 1

The correct answer is:

(a) increased

Blowby losses vary with the square root of inlet pressure, and they increase as the compression ratio is increased. A higher compression ratio leads to greater combustion pressures, which in turn increases the likelihood of combustion gases leaking past the piston rings into the crankcase, contributing to higher blowby losses.