How the elusive 4-rotor rotary engine works

As the old saying goes, there is no replacement for displacement. That’s not the case when it comes to rotary engines, which typically have very small displacement. Instead of cubes, if you want a rotary to make more power you do two things: add more rotors and/or slap on a turbocharger or two. Noted rotary aficionado Rob Dahm did both with his…

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How the elusive 4-rotor rotary engine works