6.7 Cummings Diesel, 6 Spd on 2040-cars

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Gas prices down, 707-hp engine production up... USA!

On Saturday, the United States of America will celebrate its 239th birthday. That means fireworks, barbecues, block parties, and, oh yeah, Hellcat engines and low fuel prices. The most American of (Mexican-built) powerplants, the big, loud, supercharged, 707-horsepower Hemi is slated for yet another production boost to match up with some serious demand, while the dino juice it runs on is cheaper than it's been in over half a decade. The Saltillo, Mexico engine factory already produces some 4,000 Hellcat engines each year – that's in addition to the Tigershark four-cylinder, the 5.7-liter Hemi, and 6.4-liter SRT Hemi V8s – and it's not entirely clear how many more might get added to that total. What we do know, though, is that Fiat Chrysler can't build the engines fast enough. "We're going to build more [Hellcats] for 2016," SRT boss Tim Kuniskis told Automotive News. "It's a small sliver of what we sell, but it really creates a halo for the rest of the lineup. For example, the next highest car, the Scat Pack Challenger, I have essentially a zero-day supply. It's sold out." This bit of good news comes on the back of something equally good – low summer gas prices. According to the US Energy Information Administration, the nationwide average for for "all formulations" of fuel in June sits at $2.885. Ignoring the remarkably low prices we saw in January and February of this year – figures that themselves hadn't been seen since May of 2009 – the national average hasn't sat that low since October 2010. So yes, it's a very a good time to be an American gearhead. News Source: Automotive News - sub. req., US Energy Information AdministrationImage Credit: US EIA Green Plants/Manufacturing Dodge Fuel Efficiency Coupe Performance Sedan dodge challenger srt tim kuniskis dodge charger srt

Diesel Power finds the ultimate modified oil-burner

For nine years, Diesel Power magazine has run the Diesel Power Challenge, this year's grindfest being "a week-long torture test that features seven events, nine trucks, 8,000 horsepower, and nearly 15,000 pound-feet of torque." The road to being crowned "the most powerful truck" starts with a dyno run, and then continues through the completion of a CDL-style obstacle course, an eighth-of-a-mile drag race while towing a 10,000-pound trailer, a quarter-mile drag race without a trailer, a fuel economy test in the mountains and finally a sled-pulling test through a 300-foot-long packed-mud pit.
What kind of trucks get into such a fight? Last year's winner, for instance - who upgraded his truck this year to prove he didn't "luck into the win" - drives a 2008 Ford F-250 Super Duty with a 6.4-liter Power Stroke V8 upgraded with a custom intake, Elite Diesel triple turbos and a two-stage nitrous system. Another competitor has a 2005 Dodge Ram 2500 powered by a 5.9-liter Cummins inline-six, upgraded with Garrett turbos, dual-stage nitrous, a seven-inch exhaust stack and twin fans built into the bed to cool the Sun Coast Omega transmission. The numbers on that truck: 1,255 horsepower, and 2,063 pound-feet of torque at the wheels. Naturally, as the image above might suggest, things don't always end well.
You'll find all five videos covering this years challenge below. A scene in the dyno video sums it all up perfectly: a competitor leaves his nitrous on too long and the crew is treated to some ominous poppings, he leans out the window, throws both hands up and shouts, "Amer'ca!"

11 vehicles from Barrett-Jackson Las Vegas worth watching

This weekend will see the world's collector car crowds descend on Las Vegas, NV for one of the biggest shows on Barrett-Jackson's popular auction circuit. There are hundreds of vehicles up for bidding, ranging from a brand-new Lamborghini Aventador to a spattering of Art Deco classics and a huge swath of classic muscle cars.
While it's virtually impossible to assemble an inarguable list of the best cars coming during the three-day, 700-plus vehicle auction, we've sifted through the listings for this year's show - it was a tough assignment, we promise - and assembled a list of what we think will be some of the most interesting lots. We'll admit, it's a bit heavy on American iron, but if you browse BJ's listings, you'll come to a similar conclusion. Still, scroll down for our list of what we think will be the most interesting vehicles at the upcoming auction.