A new patented air intake system for the Duramax diesel on the 2017 Silverado warrants a redesign of the hood panel.
Developed specifically for the new Silverado HD, the system provides dry, cool air for cooler engine temperatures and sustained performance. The tell-tale sign is the dramatic hood scoop that provides 60% of the engine’s intake.
The scoop includes a unique air/water separator to ensure only dry air (which enhances combustion) is drawn into the engine. The separator is a sharp 180-degree turn (a hairpin, if you will) in the intake housing, which causes a sudden decrease in velocity and causes moisture particles to form into larger droplets on the outside wall of the turn, and are then drained away through a valve.
Cooler air allows the engine to run better under heavy loads such as during trailering (and especially in hilly conditions), under which engine and transmission temperatures can rise quickly, such as during trailering. The hood scoop has a Ram Air effect (packing more air into the intake, which causes the fuel injection system to provide more fuel).
The remaining 40% of the air intake comes from an opening in a dry location in one of the front fenders, blending with the cooler air from the hood scoop. The two locations allow the engine to still receive air even if one of the intakes is blocked (for example, in the winter time, if snow blocks the hood intake).
The company tested the truck in various conditions that could create reduced air flow — thick mists and monsoon rains, powdery snow to ice pellets, and desert dust to Arctic cold.
“Big, heavy raindrops from a thunderstorm are relatively easy to eliminate from air. The more challenging issue comes from the mist-like spray generated by semi trucks on wet highways,” said Kevin Dunn, global vehicle performance for splash engineering. “Those very fine water droplets prove more challenging to separate from the air. The air intake is an elegant solution that works well with water droplets of all sizes. For customers, the result (is) maximum engine performance and even greater towing confidence.”
“The 2017 Silverado HD was engineered to provide maximum utility for our customers in even the most extreme situations,” said Eric Stanczak, chief engineer, Silverado HD. “While developing this all-new induction system, we considered our customers towing a maximum-weight trailer through the Eisenhower Tunnel on a hot, rainy summer day.”
Located west of Denver, Colorado’s Eisenhower Johnson Memorial Tunnel is the highest vehicle tunnel in the world at 3,352 metres above sea level, as well as one of the highest elevations to drive on in North America, and provides one of the more extreme driving conditions on the planet.