By now, you have probably heard that YouTuber Rob Dahm is building the outrageous ...
By now, you have probably heard that YouTuber Rob Dahm is building the outrageous FD Mazda RX-7 featuring the four-rotor Wankel engine.
It’s the engine layout that’s never been used in a production vehicle before—every factory rotary vehicle has come with only two, at most three, rotors in its spinny-triangle engine.
As you can imagine, building the four-rotor is way more complicated than just joining the two twin-rotor motors at the eccentric shaft.
Jason Fenske of Engineering Explained is here to elucidate just what it takes to build the four-rotor engine that won’t tear itself apart the first time it’s fired up.
Just like in the piston engine, the firing order has to be precisely engineered. Imbalanced combustion events will create the terminal stresses, bad news for any engine, but especially bad in the high-horsepower build.
Dahm is aiming for the 10,000-RPM redline in this monster rotary, so everything has to be done to exacting precision.
The answer? The unique firing order unlike anything you have seen in the familiar two-rotor Wankels that prowl the streets of the world. And here’s Engineering Explained to show you the how, and the why, of this unique engine.
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