INDIANAPOLIS, IN– Ford’s 2016 F-650 and F-750 trucks will be quieter than outgoing models because of the redesigned turbo diesel engine, according to Ford.

The 2016-MY medium-duty trucks are powered by a Ford 6.7-liter Power Stroke V-8 that’s 25 percent quieter in the cabin, Ford said at the National Truck Equipment Association’s (NTEA) Work Truck Show. When idling, the engine is as much as 45 percent quieter in the cabin and 35 percent quieter in front of the grille.

“While the truck is able to work harder, we also made life inside the cab easier,” said John Ruppert, general manager of Ford commercial vehicle sales and marketing. “Lowering in-cab and exterior noise levels improves driver comfort and minimizes disturbances while idling at work sites.”

When traveling at about 100 km/h, the level of engine noise in the cabin drops to 68 decibels from 74 decibels compared to the prior model, according to Ford. Idling levels have fallen to 48 decibels from 63 decibels.

Ford achieved the quieter cabin through engine engineering. Ford made specific design upgrades to the fuel injectors to optimize the combustion process, which features a two-stage combustion event instead of a single-injection event to avoid harsh, sudden and loud combustion. A starter or pilot fuel injector in the engine begins the compression process before the main injection. The result is smoother combustion with less diesel clatter and a reduction of intrusive engine sound both inside and outside the truck, according to Ford.

At idle, two pilot injection events make the firing process even smoother to aid in quietness. The “ticking” of the high-speed injectors is masked by specially designed covers on the engine.

Mounting the engine’s turbocharger inside the engine block valley also brings improvements in overall noise, vibration and harshness.

The trucks will be available this summer.