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2014 Chevrolet Silverado and GMC Sierra debut all-new designs, three new engines

General Motors has finally dropped the curtain on the 2014 Chevrolet Silverado and 2014 GMC Sierra. Both trucks have undergone substantial revisions with updated versions of the company's 4.3-liter V6, 5.3-liter V8 and 6.2-liter V8 engines. In a shot across the bows of both Ford and Chrysler, GM says it won't use a V6 engine adapted from passenger car applications. Instead, it developed the 4.3-liter engine based on its proven truck-duty architecture.
All three mills will boast direct injection fuel systems as well as a new cylinder head design. Combined with a revised piston, the new engines feature a smaller combustion chamber with a compression ratio of 11:1 or higher depending on the application. Cylinder deactivation and continuously variable valve timing are all part of the recipe, and each engine is paired with a six-speed automatic transmission with auto grade breaking. So far, no fuel economy or horsepower figures have been released, though GM says the new engines will best their predecessors in both areas.
Outside, the trucks feature a number of enhancements to reduce drag and wind noise, and GM claims both the Silverado and Sierra will offer buyers some of the quietest cabins in the class. Extended cab models now feature front-hinged rear doors to allow easier access to the back passenger area, and Crew Cab buyers can now select between a five-foot, eight-inch bed or a six-foot, six-inch bed. Buyers with a mind toward going off road will also rejoice in the return of the Z71 package, complete with Rancho shocks, front tow hooks and additional under-body protection.

Next-generation Chevrolet Colorado breaks cover in new spy photos

The next-generation Chevrolet Colorado broke cover in this fresh set of spy photos this week, giving us a glimpse of what to expect when GM's compact trucks are replaced in what is expected to be either 2023 or 2024.  Thanks to its still-extensive camouflage, this prototype doesn't give away a ton about the new Colorado's styling, but in profile, it appears as though the swoopy, upswept rear cab line might become a thing of the past. We wouldn't be surprised to see the new Colorado adopt a more angular, squared-off look more akin to that of its big brother, the half-ton Silverado. The Silverado is also expected to donate what may be the new Colorado's only powertrain. Taking a cue from Ford, Chevy is expected to offer the next-gen Colorado with just a turbocharged four-cylinder engine — the new corporate 2.7T in this instance. The large, 310-horsepower four-pot can easily take over for the 3.6L V6 currently available in the GM twins and one-up the 270-hp Ranger to boot. This would mark the end of both a V6 and diesel option being offered in GM's midsize trucks, and tracks with the company's slow, silent effort to eliminate lower-margin models. We say "trucks" because, well, whatever happens with Chevy is likely to translate to GMC. The Canyon will be due for replacement at the same time, and will likely carry on as a re-skin of Chevy's offering. We're not yet certain exactly when Chevrolet will start selling the next-gen Colorado, but given the reasonably complete state of this prototype, we expect it won't be long now. Rumors suggest it could hit the market in 2023 as a 2024 model.  Related Video: The Best Midsize Pickup: Ranger vs Gladiator vs Tacoma vs Colorado

1983 Motorweek showdown pits Porsche 928S vs. Chevy Camaro Z28

Last month, Motor Trend threw the Camaro Z/28 and Porsche 911 GT3 into the bear pit and let them fight it out. Way back in 1983, MotorWeek had the same idea, comparing the Camaro Z/28 to the Porsche 928S. At the time, the Camaro was America's best selling sports coupe, the 928S was Porsche's top-of-the-line model that also had the highest top speed of any car sold here. And the price differential was even more stark then: $13,600 for the Camaro, $45,000 for the Porsche. That put the Z/28's cast-iron, 5.0-liter V8 with 190 horsepower and 240 pound-feet of torque against the all-aluminum 4.7-liter V8 with 234 hp and 263 lb-ft in the 928S. Even with that and the Camaro being 14 inches longer than the Porsche, the American was a surprising 40 pounds lighter than the German. The show took them to Summit Point Raceway in West Virginia to see how close a relative performance bargain could hang with a the German GT. Both had five-speed manual transmissions, but the high-speed corners and tight sections of Summit Point would test other handling variables, including the "bone-rattling" Camaro's solid rear axle and disc and drum brake setup vis-a-vis the four-wheel disc brakes and independent suspension on the "firm-but-smooth" Porsche. Paradoxically, the larger disparity 22 years ago resulted in a closer result. Check out the video to see how the Summit was won. News Source: MotorWeek via YouTube Chevrolet Porsche Coupe Luxury Performance Classics Videos chevy camaro z28 porsche 928 retro review