do diesel cars have spark plugs or what do they have
2007-03-23 03:33:20 · 10 answers · asked by killbot123654 2 in Cars & Transportation ➔ Other - Cars & Transportation
no they have glow plugs
2007-03-23 03:37:20 · answer #1 · answered by Anonymous · 2⤊ 1⤋
SOME diesel engines contain a glow plug of some sort. When a diesel engine is cold, the compression process may not raise the air to a high enough temperature to ignite the fuel. The glow plug is an electrically heated wire (think of the hot wires you see in a toaster) that heats the combustion chambers and raises the air temperature when the engine is cold so that the engine can start. Smaller engines and engines that do not have advanced computer control use glow plugs to solve the cold-starting problem.
A gasoline engine intakes a mixture of gas and air, compresses it and ignites the mixture with a spark. A diesel engine takes in just air, compresses it and then injects fuel into the compressed air. The heat of the compressed air lights the fuel spontaneously.
A gasoline engine compresses at a ratio of 8:1 to 12:1, while a diesel engine compresses at a ratio of 14:1 to as high as 25:1. The higher compression ratio of the diesel engine leads to better efficiency.
2007-03-23 10:44:28 · answer #2 · answered by Anonymous · 0⤊ 0⤋
No spark plugs, but they do have "glow" plugs to assist in starting a cold engine. These are little heaters that glow with current for a few moments during the start of the engine. The reason that diesels have a delay and an indicator to watch before you can start is to get the glow plugs up to the temperature they need to be at to start the engine.
2007-03-23 10:39:48 · answer #3 · answered by yes_its_me 7 · 0⤊ 1⤋
No they have plugs that glow called glow plugs that's for cold starts only.The diesel engine works by compressing the fuel and air mix until it combusts.So its an internal combustion compression ignition engine.Go to howstuffworks.com you can see an automated diagram of exactly how a Diesel works
2007-03-23 10:43:27 · answer #4 · answered by mick 6 · 0⤊ 0⤋
Nope. They don't need them. A diesel works by compressing the air ALOT during the compression stroke. more than double the compression that occurs in a normal gasoline engine. This causes it to get VERY hot. At just the right moment the fuel is sprayed into the combustion chamber where the superheated air causes it to ignite almost instantly. So, there is never a need for a spark plug.
2007-03-23 10:41:09 · answer #5 · answered by Louis G 6 · 0⤊ 2⤋
Hey, the only stupid questions are the ones that don't get asked. Diesels have glow plugs, mostly to get a cold engine going initially.
2007-03-23 10:37:59 · answer #6 · answered by Arthur O 5 · 1⤊ 1⤋
they have no plugs
they have some starting glow coils to get the motor going but after that the motor itself has so much cylinder pressure that the motor actally runs by it self
thats why youcant cut the key off in a diesel you must stop the flow of fuel to cutoff a diesel they have to have timed fuel delivery to the top dead center of the cylinder at that precise moment a controled explotion occurs in the chamber and BOOM the motor shves foward and another cylinder fires and its all very fast.and smooth .
2007-03-23 10:44:01 · answer #7 · answered by Anonymous · 0⤊ 0⤋
Yes they do, however they are called "Glow Plugs", they heat up in cold weather in order to fire up the fuel thickened by the cold temperatures.
2007-03-23 10:38:11 · answer #8 · answered by twostories 4 · 0⤊ 1⤋
yes but just to get started
2007-03-23 10:42:15 · answer #9 · answered by Anonymous · 1⤊ 0⤋
Your so right, this is a stupid question.
Have a great day!!!
2007-03-23 10:37:58 · answer #10 · answered by Lyric 4 · 0⤊ 6⤋