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Mazda6 Skyactiv-D Racecar ready to bring diesel to Grand-Am

It may not be quite as radical as some of the company's past rotary racers, but the new Mazda6 Skyactiv-D racecar does have a notable powertrain underhood: the automaker's brand-new clean diesel four-cylinder engine.
Three of these new diesel-powered Mazda6 racers will take to the track in the Grand-Am GX class of the upcoming 2013 Rolex 24 at Daytona on January 26, with five drivers on each team. The car you see above, number 70, is sponsored by Mazda's longtime motorsports partner, SpeedSource.
Check out our full gallery of high-res images live from the 2013 Detroit Auto Show above and feel free to read through the related press release from Mazda below.

Mazda Vision Coupe | Tokyo Motor Show's big, sensuous 4-door

Mazda has been making a lot of noise recently about not giving up on the rotary engine. Enough that we started to think it might show a new epitrochoid-engined concept at this year's Tokyo Motor Show. But the brand is nothing if not surprising. Have you driven a CX-5 or a CX-9? Have you noted the real-world fuel economy in a Mazda3? Have you looked at a Miata RF? So instead of trotting out the latest in Wankel weirdness, today in its home market, the Mazda folks pulled the silk off of a stunning full-size four-door design concept, the somewhat inaptly named Vision Coupe. Known mainly for sporty and affordable small(ish) vehicles, Mazda hasn't really had an entry in this category since ... ever. Well, save for the staid and short-lived 929 of the '90s (and the rotary-powered, 7/8-scale Olds Cutlass, JDM-only Roadpacer of the '70s.) As customers flock to crossovers, it's not exactly a category brimming with vitality, at least in the American market — sales of the existing Mazda 6 are down in the States by nearly 25 percent this year, double the market average for cars. And this thing is bigger than that. But the decision is intentional and strategic in Mazda's mission to head upscale and focus on clean design — differentiators from its mass-market Japanese peers. "A big sedan has always been the symbol of a brand going premium. It's the icon of a brand," says Julien Montousse, Mazda North America's director of design. "It tells that Mazda is becoming serious in reaching that goal." Breaking even more conventions, while Mazdas generally are cohesive and well-rendered in their design, you would be hard-pressed to find one quite this sensuous. The Vision Coupe looks like an Aston Martin Rapide that has been placed in a sauna until its body-mass index has whittled down to marathoner levels, and then scalloped and stripped of any unnecessary ornamentation, save for a kind of fingerprinted whorl in its side cove. It is elemental, at once planar and burnished, with the lovely long-hood/short-deck proportions of a classic front-engine, rear-wheel-drive grand tourer. Its interior is similarly edited, doing away with the proliferating screens of other vehicles in the category, utilizing instead a digital analog instrument panel and a sophisticated heads-up display that keeps a driver focused on the road and shows just what is deemed necessary, and nothing else.

Mazda Skyactiv-D racer first diesel to run at Indy in 60 years

While it may not be touting the old "Win on Sunday, sell on Monday" axiom we all know and love, Mazda recognizes that racing can only improve its cars. And so it's no surprise that the Japanese automaker is testing and refining its Skyactiv-D diesel engine by sending it out on various race tracks around the country - notably being the first diesel ever to compete at Daytona and the first to notch a Grand Am win at Road Atlanta.
Next up? Indy. It has been over 60 years since a diesel-powered machine ran at the Indianapolis Motor Speedway, and the Cummins-powered racer that competed in the 1952 Indy 500 with a 6.6-liter inline-six-cylinder oil-burner was a fast and brutal machine that set a new lap record in qualifying leading up to the race. Though that car was withdrawn with turbocharger failure 71 laps in, its diesel powerplant left an indelible impression on the racing community, and that's something Mazda hopes to accomplish once again.
Mazda says that the diesel engine in its race car is pretty darn close to stock - 51 percent stock by parts count, and 63 percent stock by weight - which means the way it performs in competition is at least a somewhat meaningful way to the stock engine's durability in the real world. Check out the image of the Mazda6 Skyactiv-D racer posing alongside the 1952 Cummins above (click to enlarge) and feel free to peruse the press release below for the rest of the details.