A deisel motor is called a cumbustion ignition engine why?

Question

How an ignition take place in a diesel motor

Answer 1

yea its different than gas, even though it compresses, and ignites different, on the combustion stroke it still sends the piston back down, just like any other internal combustion engine

Answer 2

Gas engines are combustion engines as well. Gas is "ignition ignited" combustion engine.
Diesel is a "compression ignited" combustion engine.
The principle is similiar to a bicycle pump. As the pump piston compresses the air, the air molecules are squeezed closer together....and they bump against each other which creates heat. If you pump a car tire with a bike pump you can feel the outside of the chamber getting warm.
A diesel, for it to run, must have a compression pressure of 400+PSI(whereas a car gas engine runs on 160 or less psi)
Once the piston on a diesel reaches TDC, (maximum compression /and heat) fuel is injected into the cylinder at an exact moment to be instantly ignited. The rattling from diesels is that explosion.
With gas engines, ignition timing can be advanced or retarded minimizing that "knocking" noise.
Diesel fuel will not ignite with spark. A cold motor uses(in most cases) glow plugs which glow like the stove element on an electric stove to get the initial firing. Once it is running, the glow plugs go out. Their job is finished. In the summer time, glows are hardly needed.
There are old diesel engines that use a gas motor to turn over the engine fast enough for the cylinders to get hot enough to start the engine. But, in most cases the engines are plugged in(blockheater wise) If not, it does take a lot of time to start them(ether helps). These engines are old bulldozer engines and stationary engines.(Glow plugs were non existant in those days)
Diesel fuel is more oilier than gasoline, which helps lubricate the motor and keep the wear to a minimum.
Not unusual to see engines with a million miles on them.

Answer 3

Because a diesel uses high pressure and heat to ignite the fuel. The compression ratio how much it compresses the fuel and air can be 20 to 1 in a diesel the pressure and heat inside the cylinder does the work. On a gasoline engine it uses a spark plug and 10 to 1 compression to light the gas -air mixture.

Answer 4

Diesel fuel will self combust during the high pressure of the compression stroke of the engine. I think its Boyle's Law that states that any gas will increase in temperature as pressure, (i.e.) compression increases.

Diesel fuel will reach its flash point temperature near the very top of the compression stroke. I am pretty sure that diesel engines also have higher compression ratios than gasoline engines.

To crank a cold diesel engine many manufactures provide an electrical glow plug to provide additional heat within the cylinder until the diesel engine is up to proper temperature

Answer 5

unlike a gasoline engine which uses a spark to ignite the fuel, a diesel engine has a very high compression ratio which makes the air that it intakes hot enough to ignite the fuel when it is injected by the fuel injector. this is all done at a specific time so when the fuel ignites it forces the piston down and makes the engine work

Answer 6

A diesel engine is an internal combustion engine, the same as a gas engine is. However, a diesel is a compression ignition engine. When the piston compresses the fuel/air mixture, it heats up and explodes to produce the energy.

A gas engine uses a spark plug to ignite the fuel and air.

Answer 7

When air and fuel are squeezed, the pressure causes it to heat up. Diesel engines squeeze it so much that it explodes on its own - no spark needed. Gasoline engines usually have a compression ratio of around 9 or 10:1. Diesels can run up to 33:1 or more.

Answer 8

When air is compressed it heats up. The compression ratio is so high in a diesel engine that when the diesel fuel is sprayed into the cylinder, the temperature of the compressed air causes it to ignite.

Answer 9

as opposed to a gasoline engine which uses spark as its ignition source. a diesel engine uses heat, and compression to fire. the compression is when the piston moves up and compresses the air/fuel mixture and the heat the engine has built up. thats why many diesel engines have glow plugs. these are used to help heat things up on cold starts.
and also why diesels can have a tendency to be cold-blooded

Answer 10

the diesel motor uses extremely high compression to combust the air/fuel mixture vs lower compression spark plug ignite in a std gasoline motor,either way it produces the force
on the power stroke to turn the crank and make it go