Mazda’s SKYACTIV Diesel Back On Track

Mazda’s SKYACTIV Diesel engine found under the hood of Mazda6 race cars in 2013 will now be found in a pair of 2014 TUDOR United SportsCar Championship prototypes.

Mazda Motorsports said it will field a pair of factory-backed SKYACTIV Technology-powered prototypes. Behind the wheel will be the four drivers who delivered nine race wins and the 2013 Grand-Am GX Manufacturers Championship for Mazda.

Sylvain Tremblay and Tom Long will share the #70 car while Joel Miller and Tristan Nunez will co-pilot the #07.  The team took their first public laps at the annual pre-season “Roar Before the 24” test at Daytona International Speedway last week.  The season opening Rolex 24 Hour race will be held January 25 and 26.

“There is no shortage of great racing talent in America”, noted John Doonan, Director of Motorsports for Mazda North American Operations.  “The decision for this year was relatively simple though as our 2013 line-up excelled both on and off the track.  Sylvain, Tom, Joel, and Tristan are all talented behind the wheel, but just as importantly, they act as a true team, supporting everyone at Mazda and SpeedSource.  Our objective is to demonstrate Mazda SKYACTIV Technology to both hardcore racing fans and the mainstream public.  With so many changes in 2014, including the new series itself, there will be a steep learning curve for everyone and we needed the best students in the sport.  We’ll announce our third drivers for the Rolex 24 at a later date, but rest assured they all fit the same mold of being team thinkers and both will have Mazda heritage in their blood.”

Mazda is the only car company racing in the TUDOR Championship with a diesel engine.  Mazda said the SKYACTIV-D Clean Diesel race engine is a true production-based engine and a carry-over from the development work done with the Mazda6 GX-class racing cars.  The engine is 51 percent stock by parts count, and 63 percent stock by weight.

Mazda declared it chose this path as it is the most honest way to demonstrate the performance, quality, durability and reliability of Mazda powerplants.

2014 Mazda Prototype Specifications

Engine Displacement:                   2,191 cc (133.7 cu. in.)

Bore x Stroke:                               86.0 mm x 94.3 mm (3.39 in x 3.71 in)

Engine Weight:                              143 kg (315 pounds)

Horsepower:                                 336 kilowatt (450 horsepower)

Torque:                                          580 pound-feet

Max. Engine Speed:                     5,200 rpm

Engine Block:                                Production Mazda SKYACTIV (Aluminum)

Camshaft:                                     Dual Overhead

Valves:                                          Four Valves Per Cylinder

Cylinder Head:                              Production Mazda SKYACTIV (Aluminum)

Valve Train Components:             Production Mazda SKYACTIV

Pistons:                                         Mahle (Steel)

Connecting Rods:                         Carillo Forged Alloy (Steel)

Crankshaft:                                   Pankl Alloy (Steel)

ECU:                                             Bosch Motorsport MS 15.2

Intake Manifold:                            SpeedSource Race Engineering

Exhaust Manifold:                         SpeedSource Race Engineering

Turbo and Wastegate:                  Garrett Motorsports, air-to-air Intercooler, Tial wastegate

Fuel Injectors and Pump:              Bosch Motorsport

Fuel Rail:                                       Bosch Motorsport

Oiling System:                              SpeedSource Race Engineering

Cooling System:                           SpeedSource Race Engineering

Transmission:                                Xtrac 6-speed sequential with paddle shifters

Chassis:                                        Carbon-fiber monocoque coupe

Weight:                                         900 kilograms (1984 pounds) – Without driver or fuel

Length:                                          4,634 mm (182.4 in)

Width:                                           1,990 mm (78.3 in)

Wheelbase:                                   2,890 mm (113.8 in)

Top speed:                                    Approximately 300 kph (186 mph) — in Daytona aero trim

Brakes:                                          AP carbon drilled discs

Suspension:                                  Independent double A-arms

Tires:                                             Continental Extreme Contact

Front:  320/650/R18

Rear:  325/710/R18

Wheels:                                         Motegi EVO 14 Technomesh, Forged Aluminum

Fuel:                                              Dynamic Fuels Renewable Diesel

Fuel Capacity:                               73 liters (19.3 gallons)