You never know what's going to turn up at Jay Leno's Garage. Leno is a fan of Wankel rotary engines and has featured a couple on the show in vehicles like a Mazda Cosmo 110S and a modified 1973 RX-3.

Rotary engines will eventually make a comeback - we trust Mazda enough to tell you that. But for now, there aren't any production cars that have one installed. And that kind of makes a 1966 VW Beetle ...

If you are rich and slightly mad, you can always put a Porsche engine where an air-cooled VW unit used to be. The budget alternative to that has always been a Subaru flat-four, because when it comes ...