The 1986 Belgian Grand Prix was won by Nigel Mansell of Williams. Despite being on pole position in Belgium, Nelson Piquet could not convert this into a win. Piquet was forced to retire in lap 16 due to: Turbo.
The race in Belgium was round 5 of 16 of the 1986 season.
The 1986 Belgian Grand Prix was a Formula One motor race held at the Circuit de Spa-Francorchamps on 25 May 1986. It was the fifth race of the 1986 FIA Formula One World Championship. The race was the 44th Belgian Grand Prix and the 32nd to be held at Spa-Francorchamps. It was held over 43 laps of the 7-kilometre (4.35 mi) circuit for a total race distance of 301 kilometres (187 mi).
The race was won by British driver Nigel Mansell, driving a Williams-Honda. It was Mansell's first victory of the season. Brazilian driver Ayrton Senna finished second in a Lotus-Renault, with Sweden's Stefan Johansson third in a Ferrari. Senna's result allowed him to take the lead of the Drivers' Championship from Frenchman Alain Prost, who could only manage sixth in his McLaren-TAG.
source: Wikipedia
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