2017 GMC Sierra HD New Duramax Engine
GMC Sierra HD range has been expanded with
the addition of the firm's redesigned Duramax 6.6-liter turbo-diesel V8. Now
more powerful than ever, the new Duramax V8 will replace the existing unit in
GMC's range and is promising improved refinement thanks to its new construction
and selection of updated features.
The engine pumps out 445
hp and 910 lb-ft of torque, a 19 per cent torque rise over the existing V8.
Impressively, 90 per cent of the unit's torque is available at a low 1,550 rpm
until 2,850 rpm, making the Sierra HD particularly useful for towing.
To achieve the additional power and torque, GMC has
gone to town with the engine. For starters, there is a new cylinder block and
cylinder heads, increased oil and coolant-flow capacity, updated
electronically-controlled turbocharger, a different solenoid fuel system, B20
bio-diesel compatibility and a full-length damped steel oil pan and refined
rocker cover, two elements that make the engine quieter than the old unit.
Elsewhere, the camshaft profile has been altered, further aiding in the greater
power.
This engine comes complete
with a bespoke air intake system that necessitates a prominent hood scoop being
installed.
