All two-stroke (or 2-cycle) engines require the operator to add a mixture of fuel and oil to the fuel tank to support engine lubrication during operation and the engine combustion chamber.

preferably one that can run on everything from kerosene to used cooking oil. This is the problem [Shane] is tackling for his entry to the 2016 Hackaday Prize. It’s an Open Source Two-Stroke ...

A two-stroke engine is fueled by a mixture of gas and oil and has no camshaft or valves. It fires every time the piston reaches the top. A four-stroke engine uses four separate strokes—two up ...