Idled for 11 years, Mazda Motor Corp.'s famed rotary engine is set to roar back to life this spring, this time helping to power a plug-in hybrid vehicle. The rotary engine, which Mazda was the first ...

When it comes to unique engine designs, one of the most prolific is the trusty rotary configuration. Instead of featuring a number of spherical cylinders moving up and down like in most internal ...