The World's Weirdest Rotary Engine Is A 118-Year-Old French Spinner That Leaks Castor Oil Everywhere

In the early days of engine building, a pre-Wankel rotary engine powered thousands of aircraft. One of several problems: It spewed castor oil on its pilots.
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The Surprising Story of the GMC Twin-Six, Detroit’s Last Production V-12 Engine

Long after luxury brands quit the format, GMC quietly built a massive V-12 for trucks and heavy-duty work. Here’s how it happened.