MATT - Your right, The air plane engine is a glow plug ignited 2-stroke that burns a mostly alcohol fuel, with yp to 50% nitro methane and about a 16 to 20% blended Castor Bean/synthetic oil for lubrication. The planes are real east on engines, and most are really low performance. The glow powered Car racing engines are at leat twice the HP of the plane engines and most rev to 30,000 to 40,000 RPM. over 1 HP from a . 129 CID or 2-1/2 HP from . 21 CID are typical. But some company had a conversion head for OS . 12 sized engines that repaced the glow plug with a screw that varied the compression, and a few other things and the engine became a true diesel, ran of a special diesel based fuel. And as you would expect, ran cooler, GOBS of low end torque, and blew the Glow Engines away!
DENNY... ... ... ... ... ... .

DENNY... ... ... ... ... ... .