two stroke engines

The earliest two stroke engine patent, by Karl Benz, seems to go back to 1878 in Manheim Germany. The first challenges were to compress the air and fuel mixture, to mix the air and fuel, to spark the ignition source and maintain the forward velocity of the air fuel mixture. Early two stroke engine designs experimented with seperate compression chambers, valves and other four stroke rudiments to make the engine work before the modern crankcase evacuation design was perfected.

Two stroke engine patent history