Dull dull question...

[Ant]

I apologise for this one....but

What are the fundamental differences between diesel and petrol engines? And why do diesels make that knocking noise?

....just sumat ive always wanted know! :rolleyes:

[jibber]

diesels work on the principal of compression ignition, hence no spark plug, just a glow plug to help start it........

[dave_s13]

ITs all here i think.

http://www.howstuffworks.com/diesel1.htm

[Ant]

Ahhh. Clear as water....! :) What a cool website!