Question

How much percentage of the cylinder bore size concerningthe thickness of the crank web?

(a) 80

(b) 60

(c) 20

(d) 40

This question was posed to me at a job interview.

My question is based upon Engine Components topic in chapter Basic Engine Components of Automotive Engine Design

Answer 1

Correct choice is (c) 20

To explain: The design features of a crankshaft is that the crankpin length is at least 30% of its diameter,which itself usually not less than 60% of the cylinder core. The thickness of the crank web is usually about 20% of the cylinder bore size.