wrong way roundOriginally Posted by Howard
Diesels have glow plugs = piece of metal heated to at a guess 600-1000c or more (600 being about the minimum for metal to glow red) so that the fuel ignites instantly when it gets intot he cylinder - and so is injected after the air near TDC.
Glow plugs are only used because the voltage needed to conduct through diesel (and make a spark) becomes stupidly high especially with the high compression.
afaik unleaded in a diesel would just mess up the fuel lines if anything, and maybe damage the engine becuase of high compression would ingnite it early and possibly overheating - but you can change compression ratio quite easly? but apart from that petrol should work fine in a diesel