Why does a diesel engine make so much noise?
Why does a diesel engine make so much noise? Diesel engines are louder for several reasons, but mainly because they ignite the fuel by pressure rather than by a spark. The compression ratio in Diesel engines is very high so it makes more noise when it goes off. Another reason is that diesels are used mainly in trucks so they are often large engines] Why does my diesel engine knock when I start it? It is because of high pressure performance of Diesel engines and auto ignition characteristics of diesel fuel in high incylinder pressure. so in the second phase...