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Mazda Revives Rotary Engine for Toyota's Self-Driving Fleet

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Race To Build Self-Driving Cars Accelerates

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Mazda Motor Corp. stopped selling rotary engines in 2012 after spending nearly half a century trying to perfect them. The company is reviving the classic technology now in what seems like an unlikely place: battery-powered, self-driving vehicles it’s developing with Toyota Motor Corp. to deliver everything from pizza to people.

Mazda will provide rotary engines to run generators that recharge the batteries for Toyota’s in-development driverless delivery fleet, Masahiro Moro, president of Mazda’s North American operations, said Tuesday in an interview.