Question

What is the range in millimeter of the end gap for the top compression ring per 25mm of bore size?

(a) 0.01-0.04

(b) 0.04-0.07

(c) 0.07-0.12

(d) 0.12-0.15

This question was posed to me in an online interview.

My question comes from Engine Components in division Basic Engine Components of Automotive Engine Design

Answer 1

Right option is (c) 0.07-0.12

The explanation: The end gap for the top compression ring is controlled from 0.07 to 0.12 millimeters per 25 mm of bore size. The second end gap should be 0.12-0.25mm wider than the top ring gap to prevent the gas buildup.