|Sources of emission
|| Emissions from a fuel-driven motor vehicle usually come from four sources: the fuel tank, the carburetor, the crankcase, and the exhaust system.
||To reduce exhaust emissions, some devices or systems control the combustion process itself, while others treat the resulting exhaust gases. Most modern vehicles use a combination.
|Combustion chamber design
||Combustion chamber design can affect the combustion process, and the level of emissions. Designs that increase gas flow rate and promote vaporisation, distribute fuel more evenly in the chamber.