GM preparing cleaner Duramax diesel engine

Article by Christian A., on August 26, 2010

GM has allowed short drives in the next-gen, meaner, cleaner Duramax diesel engine, although in the lighter-duty G-van (Chevy Express/GMC Savana) application. Changes to the new D-max are significant, including revisions to the cylinder block to improve rigidity and reduce noise, an upgrade to 2000-bar (29,000-psi) piezo injectors, and a complete system-hardening to tolerate 20-percent biodiesel mixtures.

Along with the upgrades to the lines, seals, and fittings required for the B20 fuel comes a switch away from post-injection of diesel fuel in the cylinder, in favor of injecting diesel fuel directly into the exhaust in order to purge the soot that collects in the diesel-particulate filter. This eliminates cylinder-wall wetting that can lead to oil dilution, which is exacerbated by biodiesel’s higher boiling point.

This approach also works better with the selective catalytic reduction (SCR, urea-injection) NOx catalyst system that will come standard with the Duramax.

Feeding this system is a 5.8-gallon urea tank that is expected to last for an entire oil-change interval, but if the truck is used for extremely heavy towing it may be expended earlier. As fitted to the vans and their chassis-cab applications, the LGH engine produces 250 horsepower and 500 pound-feet of torque. Exact specs for the 3/4-ton pickup application have yet to be disclosed but expect that they'll be at least as high as the current ratings (365 hp/660 lb-ft).

The unladen test van accelerated briskly and seemed quite responsive to rolling onto the throttle. The system incorporates a noise-reducing block so the fact that you're driving a diesel vehicle won't be that obvious. [via motortrend]

If you liked the article, share on:

Comments

Recommended

Polestar is notably known to be Volvo's internal performance specialists, and around last year Polestar revealed to the public that it will utilize electrification to further advance the power of...
by - June 26, 2017
Earlier this month, Porsche introduced to us the 911 Turbo S Exclusive Series. The car wore a Golden Yellow Metallic paint. The same time it was launched, the company said...
by - June 26, 2017
Last month, the Lamborghini Centenario made its way to the Transformers: The Last Knight premiere where it got the attention of many. Following that event, three Lamborghini Centenario coupes landed...
by - June 26, 2017
The Holy Trinity of hypercars may not be accessible anymore after being discontinued, but that doesn’t mean we won’t see any more hypercars in the future. What we know is...
by - June 26, 2017
Kia is taking things a step further with the new Kia Stinger, which they first introduced at the 2017 Detroit Auto Show. With the specs given to us by the...
by - June 25, 2017
Facebook

Youtube Channel

Tip Us
Do you have a tip for us?
Did you film an important event?
Contact us
Newsletter
Subscribe to our newsletter!
Subscribe
Galleries