Retrofitting Two-Stroke Engines To Run On Biogas?
by Thomas H. Culhane, Solar CITIES
I've been reading your "future of two-strokes" with great interest, "scavenging" (as it were!) information to see if your lessons can be applied to third world development. As you are probably well aware, longevity, cost and replace-ability issues make two-stroke engines the favored solution for developing countries, yet their emission problems and inefficiencies make them a nightmare.
A company called "Envirofit" has created retrofit kits that use a new cylinder head with direct injection to reduce emissions in the Philippines by 90% and give 35% better fuel economy. What we are trying to do in Egypt, however, is to find a way to run two-stroke gensets and vehicles off of biogas (60% methane, 40% CO2) that we make ourselves. We have the converter kits for the carburetors from US Carburation in West Virginia so we are not using DI, and we can get the engines to run on our biogas. But of course we can't lubricate them so engine failure will happen in short order. Do you have any ideas how we can lubricate a two stroke engine if we aren't introducing the oil as part of the fuel? You mention direct injection lubrication - how might we do that? Any ideas would be greatly appreciated!!