 | |
| Predecessor | March 703 |
|---|---|
| Successor | March 723 |
| Technical specifications | |
| Chassis | Monocoque (713M) Space frame (713S) |
| Transmission | Hewland 4-speed manual |
| Competition history | |
| Notable drivers |  James Hunt Roger Williamson |
The March 713 was a Formula 3 racing car designed, developed, and built by March Engineering in 1970, and used from 1971. [1] [2] [3]
For the first time, the tubular space frame was replaced by a GRP monocoque, which initially caused some stability problems. The vehicles were equipped with Toyota and BMW engines, the latter being inferior to the double camshaft engines of the Japanese due to the single camshaft principle.
Even the inexpensive use of mass-produced parts such as the central throttle valve of the BMW 3.0 CSi did not necessarily contribute to the competitiveness of the straight engine from the BMW 2002, which had its problems primarily in terms of torque. Flanged to this was a 5-speed Hewland Mk.IV gearbox, which initially sent power to the rear wheels via Hardy discs on the driveshafts (which were often later replaced by CV joints).
Just like its successor, the 723, the vehicle was not very successful; it was only with the 733 that the type became more mature and successful.
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The Cooper T83 is an open-wheel formula racing car, designed, developed and built by British manufacturer Cooper, for Formula 3 categories, in 1966. It was an evolution of the previous T76. It was powered by a 998 cc (60.9 cu in) BMC four-cylinder engine, developing 88 hp (66 kW) @ 7,750 rpm, which had a 12.5:1 compression ratio. The chassis used was a tubular space frame, while the body was constructed as a semi-stressed skin. The front suspension was altered to widen the front track and minimise the leverage rate of the front shock absorbers. The rear suspension was also totally reworked, to equal the symmetry of the T81 Formula One car. The car was not successful. It suffered severe understeer, due to the undertray of the car being "flat-bottomed" in design, almost creating aerodynamic vortices under the car, and affecting its ground effect properties. Only 7 models were produced. A developmental version of the car used a larger Cosworth SCB Formula Two engine. It entered more than 5 races, and claimed one pole position, but didn't finish that particular race; with the wheel coming off, and achieved no further success after that.
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