May 2014 Issue

Airplains Inpulse ADI: Mogas for Big Engines

Methanol/water injection definitely tames detonation, but it may take a larger avgas-to-mogas price difference to make the numbers work.

In the world of internal combustion engines, technology has declared war on octane. Thanks to sophisticated engine control units and knock detection, ever fewer modern cars require high-octane fuel. Aircraft engines, naturally, have been left behind, stranded on their own little island of octane neediness. And so the perverse problem of finding a replacement for leaded 100-octane avgas.

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