2007-03-11 00:33:32 · 10 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
Glow plugs pre-heat the intake to aid a cold engine in starting. They have nothing to do with the continued operation of an engine after starting. If glow plugs are not used, the engine probably has an ether starting aid or a manifold heater.
2007-03-11 00:39:07 · answer #1 · answered by Anonymous · 1⤊ 0⤋
They heat up the cylinder to make combustion easier to obtain. Cold diesel fuel gels and does not combust bery easily.
As for why some have them and some do not, it's manufacturers preference.
Volkswagon built the highest compression diesel engine in their rabbits back in the late 70's early 80's and used glow plugs. I believe the compression ratio was 26:1 in that engine!
2007-03-11 08:46:34 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Glow plugs warm the diesel a little to help it ignite...diesel doesn't burn as easily as petrol. All diesel engines should have them! But maybe they have invented something new in the modern car that you don't have to wait for the warning light to go out?
2007-03-11 08:37:22 · answer #3 · answered by doingitallforwrenches 3 · 0⤊ 0⤋
the reason why diesels nned glow plugs is because diesel is a combustable fluid but to be combustable it needs the heat to do so, diesels that have glow plugs have an indirect injection system this is where the deisel is not shot straight into the cylinder block, diesels that dont need heater plugs are those that are called Di or direct injection, these are were the diesel get shot straight into the cylinder block, hope this helps
2007-03-11 08:43:09 · answer #4 · answered by Anonymous · 1⤊ 1⤋
heater plugs glow red hot inside the pcc's and diesel mist is sprayed onto them causing a highly combustable vapor. in indirect system direct systems inject straight into the cylinders heater plugs protrude out of head face. some engines have a heater coil in the air intake and diesel is heated by this to aid starting. some single cyl engines and older designs rely just on compression.
2007-03-11 09:12:41 · answer #5 · answered by Mick W 7 · 1⤊ 0⤋
they do what they sound like they do. they glow hot and ignite the fuel when under pressure. I have never seen a diesel that dosn't have glow plugs but Im sure they have something in them that does the same thing . they just call them something else so they can charge more money for them.
2007-03-11 08:40:37 · answer #6 · answered by dan v 2 · 0⤊ 0⤋
glow plugs glow red hot to ignite the fuel-air mixture. some engines don't need 'em because diesel can be ignited just by compression
2007-03-11 08:38:02 · answer #7 · answered by neutron 3 · 0⤊ 2⤋
heat the Diesel ready for combustion
2007-03-11 08:37:37 · answer #8 · answered by Anonymous · 0⤊ 0⤋
They preheat the fuel to make it easier to ignite under compression. I thought they all had them, but I'm not a diesel mechanic.
2007-03-11 08:37:22 · answer #9 · answered by Fordman 7 · 0⤊ 1⤋
there basically the spark plugs of a diesle engine but after starting the diesle engine they act as the spark plugs basically
2007-03-11 09:12:58 · answer #10 · answered by Cory W 1 · 0⤊ 1⤋