The improvements that Mack made on their 2017 Granite engines can bring benefits and advantages to vocational customers, without the extra complexity that normally complements government-driven regulations for emissions. For instance, greenhouse gas (GHG17) standards require about three per cent reduction in total carbon dioxide (CO2) output. But the company exclaims that their engine actually exceeded the minimum prerequisite and achieved the required improvement with regard to fuel economy.
Per Curtis Dorwart, Mack’s refuse product marketing manager, mentioned that most of the changes can be found under the skin of the engines of the MP7 as well as MP8 engines. Some of the most significant ones are the patented wave piston bowl as well as an enhanced common rail fuel system that are placed there to boost combustion efficiency.
“It’s stupid simple,” according to Dorwart when asked to go through the details of how the mentioned features boost fuel economy. “In a conventional combustion bowl, you squirt the fuel in, six plumes of fire hit the side of the bowl and then collide with each other and fight for oxygen, which isn’t there. The oxygen is closer to the point of injection. So, the wave piston makes little small pockets where that fire front from each individual plume goes. It pushes the flame front back to the center of the cylinder where the oxygen is. It lessens the soot load to the point we can hardly measure it now,” he added.
Aside from the abovementioned improvements the Granite is packed with an innovative throttle assembly that is specifically designed to boost the overall flow of the exhaust gas re-circulation (EGR). Plus, it comes with a new after-treatment system that can reduce weight by up to 17 pounds. Afterwards, this gives back a frame rail space of about 11 inches. According to Dorwart, all of the enhancements can contribute to fuel savings of approximately three per cent. “This is one emissions regulation where this is a lot of upside,” he added.