Mack Trucks is officially rolling out its selective catalytic reduction (SCR) system for its EPA 2010-compliant engines at the World of Concrete show being held this week in Las Vegas. The OEM said the system, which it has dubbed ClearTech, is engineered to reduce truck exhaust emissions down to the levels mandated by the new standards.
According to Mack, ClearTech reduces oxides of nitrogen emissions (NOx) down to near-zero, while at the same time improving fuel economy by up to 5% and reducing active regenerations of the diesel particulate filter (DPF). The OEM said it has been building trucks equipped with ClearTech since November .
Mack Granite concrete mixer trucks equipped with ClearTech SCR systems will be on display at the Mack’s World of Concrete exhibit
“Mack’s ClearTech does it all – and does it better than other systems which aren’t even available yet,” said David McKenna, director of powertrain sales & marketing. “It reduces NOx emissions to extremely minute levels, while effectively eliminating DPF active regeneration. That means better fuel efficiency and reduced operating costs.”
McKenna said Mack tested ClearTech in customer fleets for more than two years, accumulating five million miles of field testing. He noted that ClearTech works by injecting diesel exhaust fluid (DEF) – a non-toxic solution composed mostly of ultrapure water, plus a smaller amount of urea, a common nitrogen-containing compound – into the engine’s exhaust stream. The fluid works with the hot exhaust and a catalyst to convert NOx into nitrogen and water vapor, two harmless and natural components of the air we breathe.
“ClearTech doesn't change the design or operation of our MP Series engines, and we’ve actually been able to increase horsepower ratings,” McKenna added. “SCR technology is transparent to the operator. Other than topping off the DEF tank every 2-3 refuels, ClearTech takes care of itself.”