What are the parts of a diesel engine that are not found in a petrol engine?

Diesel engines have several components that are not found in petrol engines, primarily due to their different combustion processes. These include a turbocharger, which is often used to increase air intake efficiency, and a higher compression ratio, necessitating stronger engine components like heavy-duty pistons and connecting rods. Additionally, diesel engines feature a fuel injector system designed for direct injection, as well as glow plugs to assist with cold starting. The absence of spark plugs in diesel engines, which rely on compression ignition, is another key distinction.