The wait is over and the anticipation is now satisfied – GM has officially debuted its heavily revised 6.6-liter Duramax V-8 turbodiesel. Actually, “heavily revised” might be an understatement. GM says only the stoke and bore remain unchanged over the outgoing LML Duramax, letting the new engine retain the familiar 6.6-liter displacement. Nearly every other component is updated or completely new for the 2017 model year.
The benefit? An increase of 48 horsepower and 145 pound-feet of torque, along with cooler operating temperatures leading to increased durability during sustained high-load events, strong cylinder heads, a stronger main block, increased oil flow capacity, a new electronically actuated and controlled turbocharging system, and an acoustically tuned oil pan and valve covers that dramatically reduce engine noise.
“Nearly everything about the Duramax is new, designed to produce more torque at lower rpm and more confidence when trailering or hauling,” said Gary Arvan, chief engineer for the new Duramax. “You’ll also notice the refinement improvements the moment you start the engine, and appreciate them as you cruise quietly down the highway — with or without a trailer.”
The advancements allow the turbodiesel to generate 90 percent of its peak torque at only 1,550 rpm and maintain it through 2,850 rpm. It’s at 1,600 rpm that all 910 pound-feet is realized. Within that power band at 2,800 rpm, the engine reaches peak its horsepower of 445. This sustained torque curve gives the Duramax a wider power band for hauling and towing. The new torque spec represents a 19-percent increase from the previous engine. Despite the added power, the Duramax is 38 percent quieter at idle.
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