It produces that power at 1,800rpm, and peak 3,700Nm of torque at 1,000-1,450rpm. The other units are 530hp, 590hp and 660hp (523bhp, 582bhp and 651bhp). Those latter three engines drive through a new G33CM OptiCruise automated manual gearbox that has been in development and testing for six years.
Fuel savings promised amounts to 6% across the drivetrain compared to previous models, consisting of 2% for the engine, 1% for the gearbox and 3% from a new rear axle ratio and driving programme.
The bottom three engine models have a new exhaust gas aftertreatment system and a twin-dosing selective catalytic reduction system to improve AdBlue atomisation. AdBlue is injected twice: once directly after the exhaust brake, with a second dose at the regular position within the silencer itself. With extra dosing, AdBlue evaporation is improved during lower load cycles as the temperature is higher near the outlet manifold, Scania says. The 770hp DC16 123 does away with the EGR completely. Other new features include high pressure fuel pump whose pumping elements are individually controlled via active inlet metering, it says. Also new is engine management system, 180A alternator, increased compression ratio, reduced internal friction and increased peak cylinder pressure, and fixed-geometry turbocharger with ball bearings rather than journal bearings.
“Raising the pressure and the power output requires that several components inside the engine, including gears, pistons, rings, cylinder heads and valves are refined and reinforced,” says V8 chief engineer Goran Lindh.
On the OptiCruise gearbox, Scania has removed five of the seven synchronisers used previously, making the gearbox shorter, and developed a new electronic control system to mitigate for their absence. Its oil volume has been reduced, and there’s a new spray system, reconfigured reversing, and increased the gear ratio spread, with supercrawler and overdrive. There is an improved retarder, new PTO programme and a new aluminium housing that helps cut weight by 60kg compared to the previous model.
Sales start in October, and production begins in February 2021.