When Williams Built a Rally Car

The Car Nerd

The Car Nerd

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Group B Playlist: Group B Rally

In 1980, Austin Rover needed a rally car capable of fighting the Audi Quattro.

So they went to Williams.

Patrick Head and his Formula One engineering team were asked to help turn the humble Metro into a four-wheel-drive Group B weapon.

The result was the MG Metro 6R4.

Williams helped develop the chassis, suspension and drivetrain layout. Austin Rover then created an entirely new naturally aspirated V6 capable of more than 400 horsepower and 9,000 rpm.

After more than four years of development, the car finally made its World Rally Championship debut in 1985.

It finished third.

Then Group B was cancelled.

This is the story of what happened when one of Formula One’s greatest engineering teams built a rally car.

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🏁 IN THIS EPISODE

We uncover the extraordinary story of the MG Metro 6R4:

• Why Austin Rover approached Williams Grand Prix Engineering
• How Patrick Head’s team completely changed the original layout
• How Williams turned a Metro into a mid-engined, four-wheel-drive rally car
• Why engineers initially used a Rover V8 with two cylinders cut off
• Why Austin Rover rejected turbocharging
• How the V64V produced over 400 horsepower at 9,000 rpm
• Why the car took more than four years to reach the WRC
• How it finished third on its World Championship debut
• Why Group B disappeared just as the 6R4 was coming good
• And how its engine later found a second life in rallycross and the Jaguar XJ220

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📺 Documentary channel: @thatjasonhassett
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