if you care so much, I can even abstain... for duty of chronicle, and to the passion I have for the engines, the old jtd design ? called unijet means that for each ignition or combustion, or as a vuooi call are made only two injections the pilot and the main, which then in-turn are adjusted according to the load ... in the multijet to be put in the field a combustion pi? clean down the combustion phase, in parit? of diesel fuel to make it ir? slowly and gradually they have adopted the strategy of using 5 injections(including pre and post) for each combustion us? that it provides for less noise? minor production of unburned lower NOx production, etc., and above all it is introduced in the post injection, which serves to regenerate the anti-particulate