Mack emissions attack
Power increase comes despite a blitz on pollution, writes James Stanford
MACK has embraced Selective Catalytic Reduction technology for its 2011 truck range.
The iconic brand, which assembles its trucks at a Brisbane plant owned by its parent company Volvo, has switched from Exhaust Gas Recirculation to SCR for its Metro Liner, Granite and Trident models to best meet the new emission standards.
The 13-litre MP8 engines have been upgraded, there’s some minor visual changes including modified fuel tanks, new power-output badges, the option of a new transmission and optional tougher axles.
The move to SCR brings a range of benefits, including lower operating temperatures and an increase in power. There is a downside though: operators will have to fill up with AdBlue, a urea-based liquid used to trigger the chemical reaction that treats the exhaust gases.
The new ADR emissions standards, which trucks built after December 31 must meet, would have meant a power and torque cut had Mack stuck with EGR on its MP8 engine.
Mack has also introduced an automated manual transmission, the mDrive. It uses the same basic hardware as the Volvo automated manual, with its own specialised software. Developed to work with the MP8 engine, the mDrive transmission is a 12-speed, two-pedal unit. You don’t need to use a clutch to set off or stop.
Mack says the gearbox increases payload and cuts fuel consumption by working with the engine’s computer to select the best gear for the driving situation.
The Mack Granite, described as a no-nonsense all-rounder, is available with a 368kW version of the MP8 engine which Mack says is class-leading and ‘‘enough for the hardest construction jobs’’.
Along with the larger Trident, the Granite is available with Mack’s own optional tough new 150/151 tandem drive axles. Mack says that these axles, which are rated to 20 tonnes and come with driver-controlled diff locks, provide ‘‘the ultimate traction in the muddiest construction sites’’ but insists they are also civilised on the highway.
The Trident, which is used for construction and road applications, has an upgraded MP8 engine that generates 399kW.
Mack has worked to fit the AdBlue storage tank without compromising the ground clearance. To do this it has introduced L-shaped fuel tanks to make better use of the available space. It says the Trident has enough AdBlue and fuel tank capacity to be able to cover all the popular east coast routes without refuelling.
Mack has also made the cabin more comfortable by installing an Isri Big Boy seat as standard.
The 2011 Metro Liner gets SCR technology but uses a Cummins ISL engine. It generates up to 298kW and is linked to the latest Allison automatic transmission.
Mack’s big daddy trucks, the Super Liner and Titan, both run the Cummins engines only. The Cummins ISX/Signature powerplants use Exhaust Gas Recirculation with a locally engineered Cummins diesel particulate filter.
Both of these are available with outputs of 410kW and 448kW.
Big Wheels understands Mack is looking to add a version of the Mack MP10 as an alternative to the big Cummins engines.
On the move: the 2011 Mack Trident has an upgraded MP8 engine that generates 399kW.