Question

Which of the following formula is used to find the force acting on the connecting rod neglecting the cos theta angle and position of the connecting rod?

(a) Force=Maximum gas pressure ×(π)

(b) Force=(π×D/4)

(c) Force=(π×D^2/4)×maximum gas pressure

(d) Force=(D^2/4)× Stroke length

The question was posed to me during an interview.

Asked question is from Engine Components topic in chapter Basic Engine Components of Automotive Engine Design

Answer 1

The correct answer is (c) Force=(π×D^2/4)×maximum gas pressure

Best explanation: The correct relationship the force acting on the piston is found using Force =(π×D^2/4)×maximum gas pressure where D is the cylinder bore,  maximum gas pressure is in the range of MPa or N/mm^2.