The latest development from engine manufacturer Hatz is the rate shaping nozzle (RSN) which helps to reduce emissions of oxides of nitrogen, according to Peter Prinz- Hufnagel, responsible for the company’s engine development, combustion and exhaust emissions divisions. ”Before, there were only standard injection nozzles with a blind hole. The disadvantage is that a small residue of fuel remains in the blind hole after injection and this is blown out again in unburned form.”
Prinz-Hufnagel continued, ”The RSN nozzle enables a higher needle stroke and, at the same time, operates in two stages: initially the nozzle lifts only slightly and there is only a small quantity of fuel injected. It is only when the pressure increases that the needle stroke is increased and normal injection [full injection] ensues.”
The RSN nozzle is now fitted throughout the B Series and in the Supra series. It is being prepared for use in the 2G40 version.