March 731^[1]

Category	Formula One
Constructor	March Engineering
Designer	Robin Herd
Predecessor	March 721
Successor	March 741
Technical specifications
Chassis	Aluminiummonocoque
Axle track	1,448 mm (57.0 in) (Front)1,448 mm (57.0 in) (Rear)
Wheelbase	2,438 mm (96.0 in)
Engine	Ford-Cosworth DFV 2,993 cc (182.6 cu in) 90° V8naturally aspirated mid-mounted
Transmission	1976: Hewland DG 400 6-speed manual. 1977: Hewland FGA 400 6-speed manual.
Weight	1,270 lb (580 kg)
Tyres	GoodyearFirestone
Competition history
Notable entrants	March Engineering
Debut	1973 Spanish Grand Prix[2]
Races Wins Podiums Poles F/Laps 15 0 2 0 2
Constructors' Championships	0
Drivers' Championships	0

The March 731 was a Formula One racing car designed by Robin Herd of March Engineering for the 1973 season which saw continued use through 1974. While unsuccessful in the hands of the works team, private entrant Hesketh Racing had some success with James Hunt driving.

March had expended much time and effort in developing the previous season's 721 model, and so for 1973 they modified the existing 721G models, moving the radiator to the front and revising the bodywork.^[3]

The works' 731 was primarily raced by Jean-Pierre Jarier without much success, and various private teams fared little better, with the notable exception of Hesketh Racing. Their car, driven by James Hunt in his first season in F1, had various modifications carried out by designer Harvey Postlethwaite, who had been recruited from March by Hesketh. Hunt finished third in the Dutch Grand Prix and second in the United States Grand Prix, and with two other finishes in the points ended up in eighth place in the World Championship. Hunt's success contributed entirely to March's fifth place in the 1973 Constructors' Championship.^[4]

Roger Williamson, driving for the works team, was killed when his 731 overturned and caught fire at the Dutch Grand Prix.

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* คะแนนทั้งหมดได้มาจากแชสซี March รุ่นอื่นๆ