Question

A hot-spot outside the combustion chamber may be sufficient to cause pre-ignition.

(a) True

(b) False

I got this question in examination.

My enquiry is from Heat Rejection topic in chapter Heat Rejection and Cooling of IC Engine

Answer 1

The correct answer is:

(a) True

A hot-spot outside the combustion chamber, such as a hot spot on the cylinder head, spark plug, or exhaust valve, can cause pre-ignition. Pre-ignition occurs when the fuel-air mixture ignites prematurely, before the spark plug fires, due to localized areas reaching temperatures high enough to ignite the mixture. This can lead to engine knocking, power loss, and potential engine damage. Thus, managing engine temperatures and preventing hot spots is crucial in preventing pre-ignition.