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What were Chevrolet's upgrades to its Duramax engines to boost power?

As we reported a few days ago, Chevrolet has upgraded its Duramax engines to boost their power output, with the 2.5-liter mill now producing 163hp and 380Nm, and the 2.8-liter unit now churning out 200hp and 500Nm.

Since we've been getting a lot of inquiries as to what the American carmaker did to improve the engines, we're listing them down for you:

* High-pressure common-rail system capable of up to 2,000bar (29,000psi);

* Water-cooled variable-geometry turbocharger (for the 2.8-liter) to enhance turbine and engine life;

* Electrical exhaust gas recirculation valve with larger cooler;

* Plastic intake manifold and lighter cylinder head material for lower overall weight;

* Optimized intake and exhaust manifolds to improve intake and exhaust flow;

* Larger exhaust port and water passage to enhance cooling efficiency;

* Balancer shaft to reduce noise, vibration and harshness, and enhance refinement; and

* New engine control module, with newly developed software by GM engineering for quicker response and added accuracy to keep the engine operating in peak form.

According to Chevrolet, the updated Duramax engines are Euro 4-compliant and can be upgraded to meet up to Euro 6 standards "if necessary." In addition, despite the increase in power output, the 2.5-liter engine's fuel mileage figure is still a decent 12.820km/L, while the 2.8-liter unit now does 10.638km/L.

Patrick Everett Tadeo
Writer's resident writer lives and breathes the news. He might have burned a few bridges along the way just to give you the most relevant--and important--ones.
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