The Mazda 737C is a prototype racing car that was built for Mazdaspeed for the 24 Hours of Le Mans under the Group C2 formula. It was the final evolution of the initial Mooncraft built design dating back to the 717C. It again used a 2-rotor 13B Wankel engine. Two 737Cs were entered in the 1985 24 Hours of Le Mans, finishing 3rd and 6th in the C2 class. The 737Cs were also raced in part of the 1985 World Sportscar Championship season, managing 8th place for Mazdaspeed in the C2 teams championship. In the All Japan Sports Prototype Championship, Mazda was able to come home 5th in the constructor's championship. 737Cs later ended up in the hands of privateers for the JSPC after Mazda replaced it with the newer 757.
The Mazda 717C is a prototype racing car built for Mazdaspeed for the 24 Hours of Le Mans under the Group C Junior formula. The bodywork and chassis were actually built by Mooncraft racing with assistance from Mazda. Two 717Cs were entered at 1983 24 Hours of Le Mans, being the only finishers in the C Junior class, and finishing 12th and 18th overall.
The Mazda 727C is a prototype racing car that was built for Mazdaspeed for the 24 Hours of Le Mans in the Group C2 class. It replaced the 717C in 1984 as an evolution of the Mooncraft-built design, and used the same 2-rotor 13B Wankel engine as the previous model. Two 727Cs were entered in the 1984 24 Hours of Le Mans, finishing 4th and 6th in the C2 class. However, a pair of Lola T616s run by B.F. Goodrich Company used the same Mazda engine and were successful in beating both 727Cs, claiming 1st and 3rd.
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