Daniel S. ReganÕs Vapor Engine transformed the Otto 4-Cycle Gas Engine of the 1880s, a large, stationary, expensive engine, into a smaller, portable and affordable power source. Using gasoline, instead of illuminating or natural gas for fuel, and using an electric spark instead of using an open flame for ignition, ReganÕs improved internal combustion engine was the beginning of a revolution; producing motorboats, automobiles, motorcycles, lawnmowers and much moreÉ