A widely acclaimed technology for reducing NOx pollution from Diesel engines is the "Humid Air Motor" (HAM). This technology is able to reduce NOx formation by up to 65%. In the HAM system the turbocharged combustion air is saturated with water vapor produced aboard the ship using sea water and engine heat. This lowers the temperature peaks in the combustion chamber, which are normally the main reason for NOx formation.
All Pielstick engines