Experimental Study of Exhaust Emissions & Performance Analysis of Multi Cylinder S.I.Engine When Methanol is used as an Additive

Abstract

Today, emissions from car exhausts play a big role in global warming. This problem is a huge concern for everyone. It's also bad for our health. In this study, we tried to see how much the exhaust emissions (like Carbon monoxide, Hydrocarbons, & Nitrous oxides) change in a four-cylinder engine. We added different amounts of methanol to gasoline and made some small tweaks to the engine's subsystems. This was all done under different load conditions.So, what did we find with the various methanol blends (ranging from 0-15%)? It turns out that the gasoline got an octane boost. The brake thermal efficiency and indicated thermal efficiency also went up too. Plus, we saw less knocking. On the flip side, CO and HC emissions dropped quite a bit. But CO2 and NOx saw a slight rise. One interesting thing was that while using these methanol blends, the combustion temperature was higher. However, the exhaust gas temperature went down steadily.