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Mazda details diesel prototype at Daytona test

Diesel has without a doubt become the dominant fuel in the modern era of endurance racing. The 24 Hours of Le Mans has been won under diesel power for the past eight years running, as has every race in the FIA World Endurance Championship since its inauguration in 2012. Yet there will only be one diesel prototype entered in the top tier of the new Tudor United SportsCar Championship this year, and it belongs to Mazda.
The last Japanese manufacturer to win at Le Mans outright, Mazda has been gradually working its way back up the endurance racing ladder once again, following the example set by Audi with diesel power. Last year it campaigned a competition-spec Mazda6 Skyactiv-D in the GX class of the Grand-Am series, but rather than simply port over the existing racer into the new series, it's fielding a new prototype instead, just as it promised a couple of months ago. And now that prototype has hit the track for the first time, prompting Mazda to release its basic specs for the first time.
Tentatively referred to simply as the 2014 Mazda Prototype, the purpose-built racecar is testing this weekend in the Roar Before the 24, the official test session at Daytona that kicks off the racing season. It packs a 2.2-liter SkyActiv-D engine that's based heavily on the production version but tuned to produce 450 horsepower and 580 pound-feet of torque in race trim. Power is channeled through a six-speed sequential transmission from Xtrac, carbon brakes from AP and 18-inch racing slicks from Continental. With the Daytona-spec aero setup, it'll top out at around 186 miles per hour.

Mazda's next-gen SkyActiv engines will drop spark plugs in favor of high compression

Homogeneous charge compression ignition, or HCCI, is the black art of internal combustion engines that aims to produce diesel-like fuel efficiency for the cost of gasoline. Although some of its competitors have developed and subsequently given up on the tech, Mazda confirmed that the next-generation of SkyActiv engines will employ HCCI technology, improving fuel economy by 30 percent and at the same time reducing exhaust emissions. According to Nikkei, a new SkyActiv family of engines is set to debut under the hood of the next-gen Mazda3 sometime in 2018 before making its way into other vehicles. In simple terms, an engine that uses HCCI burns the air/fuel mix using pressure instead of with spark plugs, just like a diesel. At 14:1, Mazda's gasoline engines already have some of the highest compression ratios out there, but a move to HCCI means cranking up the compression to 18:1. While the tech sounds relatively straightforward, using HCCI means dealing with a number of side issues. It's one of those "on paper" ideas that compounds problems when put into practice. Heat, revs, and fuel must all be carefully managed as gasoline doesn't burn the same way as diesel. Mazda is mum on details, but the automaker seems confident that the issues have been sorted. If the new engines do indeed make it to market with HCCI, Mazda will have out-engineered GM, Daimler, and Hyundai, all of which have tried and failed to develop HCCI engines in a cost-effective package. With the market moving towards electrification, it's interesting to see Mazda still focusing so heavily on traditional internal combustion gasoline engines. It's an indication of where they see the market heading for the next few years. Although the automaker has been hesitant to move forward with hybrid and electric powertrains, Nikkei also reports that Mazda will begin mass production of EVs in 2019. Related Video:

2017 Fiat 124 Spider priced below most Miatas

The Fiat 124 Spider and Mazda MX-5 Miata might be siblings, but all that means is the rivalry between the two cars will be unusually intense. Pricing for the reborn 124 has been released and is added proof of that fact – aside from the very base trim, the turbocharged Italian is cheaper than its Zoom-Zoomy brother. Fiat's base model, the 124 Spider Classica, starts at $25,990. The MX-5 Sport isn't much cheaper, at $25,735. Both cars get 16-inch alloy wheels, black cloth seats, LED taillights, but the Mazda will throw in LED headlights. It's also interesting to note that the two cars have differing destination charges – $995 for the Fiat and $820 for the Mazda. Move up to the mid-range Fiat, and you'll start to see the "Italian" car eke out a pricing advantage. The Lusso, Italian for luxury, rings up at $28,490 compared to the MX-5 Grand Touring's $30,885. Yes, we're comparing the middle-tier 124 to the range-topping Mazda, because the mid-range, enthusiast-oriented Club is more analogous to the 124's Abarth model. The Lusso matches the MX-5 GT with 17-inch alloys, heated leather seats, a 7.0-inch touchscreen with navigation, and dual-zone automatic climate control. The Mazda does come with a bevy of safety features as standard – blind-spot monitoring, lane-departure warning, and automatic high-beam control – which look to be optional on the Fiat, so take that into consideration if you're thinking about buying one of the two. We enthusiasts are most interested in the matchup between the 124 Spider Abarth and the MX-5 Club. The scorpion-badged 124 starts at $29,190 and the Club at $29,420. You'll get more power – 10 additional ponies according to FCA – as well as all the performance goodies from the Club. There are Bilstein-tuned shocks, a mechanical limited-slip diff, and a front strut bar, plus a very imposing exhaust note. Recaro seats will be an optional extra, as will Brembo brakes (the MX-5 bundles them with BBS wheels). Finally, there's the 124 Spider Prima Edizione Lusso. The limited-edition wears Azzurro Italia (translation: pretty blue) paint and rings in at $35,995, which gets you a bunch of swag on top of the normal Lusso stuff. Oh, and if you choose the automatic transmission, you'll be punished with a $1,350 charge, regardless of which Fiata you go for. That's less than the premium Mazda charges for an automatic on an MX-5 Club or GT, but more than the $1,480 extra it charges for a two-pedal Sport.