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Mclaren M9a - 1969 | 
| During 1969 three different fourwheel-drive cars took part in grand prix competition: The matra ms84, lotus 63 and- mclaren m.9a. All experienced mechanical problems, and none came close to winning a gp race. Entered only in the british gp, the mclaren retired early when a rear-suspension upright snapped. | Specifications performance
Top speed of 168 mph
engine typedrivetrain: V8, 2 overhead camshafts per cylinder bank, 4 valves per cylinder
displacement 2,993 cc power rating 450 hp transmission 5-speed manual
chassis: Suspension by coil-springdamper units, with antiroll bars; Ventilated disc brakes; 1,160 lbs. |
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| | About vehicle
Not ready for prime time
these cars were not the first fourwheel-drive one-seat racers. Bugatti made one in the 1930s, stirling moss won a i960 formula one race aboard a ferguson, and novi, lotus and lola later entered fourwheel-drive cars in the indianapolis 500. But for a number of reasons, including too much weight and steering problems, they could never match conventional racers under normal conditions.
turned-around engine
designed by jo marquart, the m9a was an aluminum-alloy monocoque over a tubular subframe and steel bulkheads. Its ford-cosworth v8 engine was turned back to front, driving forward to a mclaren-designed transmission just behind the drivers seat. Driveshafts along the left side of the car led to front and rear limited-
slip differentials with antispin locks. The torque-split ratios of the central differential could be changed very quickly.
This fourwheel-drive mclaren m9a, driven by derek bell failed to finish the british grand prix, the only race in which it was entered. |
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