Re: D&S Diesel #107 Smoke and mirrors

Now we're on the same page! Lol except for one small nit to pick, in a diesel engine there is never to much air for the fuel being injected. There is no throttle plate to regulate the amount of air going into the engine like there is on a gas engine. Diesel's run wide open and engine speed is determined solely by the amount of fuel being injected. Except for the air being pressurized by the turbo the amount of air getting into the engine per stroke is the same at low idle as high idle. fun fact, fuel delivery is the same also. say for instants low idle fuel delivery from the injector is 15 mm3/st (that's cubic millimeters per stroke, its how fuel delivery is expressed on the test plan for the injection pump) that's the fuel delivery required to maintain 650 rpm idle and the engine is setup for a 2000 max rpm limit, high idle would be around 1950 rpm this is the speed the engine will run, at full throttle no load, and the injectors are delivering 15 mm3/st. If the engine speed increases above 1950 fuel delivery is cut back further and at around 1995-2000 rpm fuel delivery is completely cut off. That would be a ton of air coming into the engine with little or no fuel and no white smoke under those conditions, just wanted to point that out