11-10-2012, 04:18 PM
a duration is a length of time
The injection duration is the length of time the injector is firing fuel into the engine and in the HDi its miliseconds.
Theres 2 ways of adding more fuel to the engine either inject for the same lenght of time at higher pressuer or inject at the same pressure for longer. the problem with injecting longer is there is only a very finite length of time when injecting fuel into the engine will actually be any use. too far before TDC and the piston will try and spin the crank the wrong way and destroy your engine, too long after TDC and there will be no compression there (and bugger all O if its all exhaust gas) and so the extra fuel wont ignite and will just be blown out the exhaust as smoke.
This is why the 1800bar sensor is really great as it gives EPIC smoke free tunes.
The injection duration is the length of time the injector is firing fuel into the engine and in the HDi its miliseconds.
Theres 2 ways of adding more fuel to the engine either inject for the same lenght of time at higher pressuer or inject at the same pressure for longer. the problem with injecting longer is there is only a very finite length of time when injecting fuel into the engine will actually be any use. too far before TDC and the piston will try and spin the crank the wrong way and destroy your engine, too long after TDC and there will be no compression there (and bugger all O if its all exhaust gas) and so the extra fuel wont ignite and will just be blown out the exhaust as smoke.
This is why the 1800bar sensor is really great as it gives EPIC smoke free tunes.