Question

During normal engine operation there is almost no metallic contact except between the compression piston ring and cylinder walls.

(a) True

(b) False

This question was addressed to me by my school teacher while I was bunking the class.

Enquiry is from Mechanical Friction in section Engine Friction and Lubrication of IC Engine

Answer 1

The correct answer is:

(a) True

During normal engine operation, a thin film of lubricant usually separates most metal surfaces, minimizing direct metallic contact. However, the compression piston ring maintains contact with the cylinder walls to create a seal for combustion gases. This area experiences higher friction and wear due to the direct metal-to-metal interaction.