How diesel ignites? and biodiesel? i mean they dont seem combustible?

Question

i understand the procces with Gasoline because its easy flamable but with Oil?.. how it works?

if you catch my question 10 points. thanks

Answer 1

diesel is ignited by pressure about twice as much as you would find in a high out put engine. i can not quote a pressure nut the operational compression ratios for a gas engine are 8-1 to 14-1, in a diesel we go to a 2201 compression ratio and that is just a starting point. we do not have to worry about a misfire because teh fuel is injected at tdc or very close to that point.  

Answer 2

Diesels ignite their fuel by shooting it at very high pressure into the chamber. It hits the piston top so hard it ignites, hence the rattle you hear is these explosions. high compression completes the burn totally, that's why they are so fuel-efficient. I guess.

Answer 3

Since Diesel is a flammable liquid it will ignite under high enough temperatures as will all flammable liquids and substances, the way that diesel is ignited in a diesel engine is by heat of compression, when you compress air heat is produced by friction of the air molecules being squeezed together when the piston is close to tdc the fuel is then injected into the combustion chamber which is at approx 420 degrees Fahrenheit which is the ignition temperature of diesel the fuel ignites from the heat not from compression contrary to popular belief.  

Answer 4

The compression of the engine. It's so high that it ignites the fuel. They don't even have spark plugs. They have Glow plugs. Compression is in the 20 to 1 area and higher I think.  

Answer 5

Diesel fuel is ignited by compression. A diesel engine has a higher compression ratio than a gasoline engine. In cold weather glow plugs heat the cylinders so the engine can start.