Last year, General Motors shelved plans to offer a 4.5-liter V-8 Duramax light-duty diesel engine in its half-ton pickups as the market for personal-use pickup trucks shrank, the U.S. economy nosedived and GM went into survival mode by shedding brands and restructuring.
Now, with signs that truck sales and the economy have turned a corner and GM refocused on its smaller product portfolio, some at GM wonder if the 4.5-liter Duramax could be revived to play a broader role, not just in light-duty pickups but in the automaker’s revamped heavy-duty trucks, too.
“The 4.5-liter V-8 is fully developed and ready,” said Mark Cieslak, GM’s full-size truck chief engineer. “[If we decided to offer it] we could launch it in a heartbeat.”
Also driving the decision to possibly pull the 4.5-liter Duramax off the shelf are tough new EPA fuel economy regulations for light-duty cars and trucks that are being phased in between now and 2016, and a new push to create fuel-efficiency standards for medium-duty and heavy-duty trucks – including pickups over 8,500 pounds gross vehicle weight – that would go into effect starting with the 2014 model year. Medium-duty and heavy-duty trucks aren’t required to carry EPA fuel economy ratings today.
“Fuel economy is top-of-mind in every vehicle discussion we have today inside GM,” Cieslak said. “Every powertrain discussion, we are breathing fuel economy.”
That has GM’s truck team wondering about using the 4.5-liter V-8 in GM’s HD pickups.
“The 4.5-liter V-8 is a legitimate contender for the 2500 segment, but are customers and [the economic environment] ready for it?” said Cieslak and Gary Arvan, Duramax chief engineer.
“[The 4.5-liter Duramax] could get a few miles per gallon more [than the 6.6 Duramax],” Arvan said. “It’s a high-performance diesel with a high level of work capability and fuel economy.”
The 4.5-liter V-8 might be a better choice for those who don’t need maximum capability from an HD pickup but still need a truck that’s tougher than a half-ton. It wouldn’t necessarily be compromise. It’s as strong as HD diesels were just a decade ago and more sophisticated.
“[The 4.5-liter Duramax] would have launched [with power ratings] about where the Duramax was in 2001 when it was introduced,” Arvan said.
Even if the 4.5-liter Duramax cost less than the $8,395 6.6-liter Duramax (including Allison 6-speed automatic transmission), it would carry a higher premium over the standard 6.0-liter V-8 in GM’s HD pickups. Offering the 4.5-liter in GM’s light-duty pickup trucks too (as originally intended) might help make the business case that finally brings this engine to market.
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