Comment Re:Stupid question (Score 1) 388
Diesel engines work without spark plugs -- they compress the air before injecting fuel; the compressed air is so hot that the fuel ignites by itself.
My truck has spark plugs, and every "consumer grade" diesel engine I have ever seen has them. So where did you hear of this non-sparking engine?
These are pre-heating sparks used for warming air in cylinders before starting the engine