Westport is debuting its high-pressure CNG fuel system with Cespira HPDI technology on a Volvo VNL 300 at ACT Expo. Another high-horsepower natural-gas engine system may soon be available from ...

Low- And High-Compression Fuel Economy Engines: The Techniques Are About The Same, But The Approach To Each Is Somewhat Different. A.Most stock cylinder heads have factory-cut undercuts of the type ...

With every passing day the Mule provides opportunities beyond our original expectations. Since the 467ci engine belongs to HPP editor Tom DeMauro, it is at our beck and call. This affords HPP the ...

They look awesome, whine, and make huge power. Yes, we're talking about superchargers, and in the world of hot rodding they are the ultimate in cool. Unlike a normally aspirated engine that relies on ...

General Motors either has a naming problem or a deep sentimental attachment to the name "LT1". If you walk into a Chevrolet dealership today and ask for an LT1, you are looking at a 455-horsepower ...

Higher octane fuel resists engine knock under compression — it is not a cleaner or more powerful fuel for all vehicles. Modern knock sensors in post-2000 engines automatically compensate for ...

If you don't care much about engine compression ratios, you're a totally normal human being. But hear us out: the other day, we encountered something surprising when poring over the specs of the ...

We may receive a commission on purchases made from links. The Duramax namesake has been alive for over 20 years and has been offered in 12 different variations. While there are some newer engines in ...

In the new big-boy Wagoneer Ls, this 3.0-liter inline-six, dubbed "Hurricane," has its work cut out: The huge SUVs weigh nearly four tons, and are expected to tow up to 10,000 pounds, too. Powerful ...