Question

To withstand which of the following the crank webs are made adequately strong?

(a) To withstand the twisting and bending loads

(b) To withstand the pressure difference

(c) To withstand against the corrosion action

(d) To withstand against the misfiring

I had been asked this question during an interview.

The origin of the question is Engine Components topic in chapter Basic Engine Components of Automotive Engine Design

Answer 1

Correct option is (a) To withstand the twisting and bending loads

To elaborate: The crankwebs should be adequately strong to withstand the twisting and the bending loads. However increasing their size excessively would increase the inertia which would tend to wind and unwind the crankshaft when the engine is running.