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An experimental study was conducted on in-use and new, Indian two-wheelers to study the effect of gasoline composition (olefins, aromatics and benzene) on exhaust mass emissions. Exhaust emissions of benzene were also measured. The study was conducted on six makes of new and in-use, two-wheelers consisting of popular 2-stroke and 4-stroke, mopeds, scooters and motorcycles. Three test fuels, a high olefin gasoline, a high aromatic gasoline and a Euro-III equivalent gasoline were used for the study. High olefin test gasoline contained 26.5% olefins, 10.3% aromatics and 0.3% benzene. High aromatic test gasoline contained 0.9% olefins, 61.9% aromatics and 1.5% benzene. Euro-III test gasoline contained 15.9% olefins, 37.4% aromatics and 0.9% benzene. Intake system deposit study was also conducted on 4-stroke motorcycles and two-stroke scooters having separate lubrication, using two fuels, i.e. high olefin gasoline and Euro-III gasoline, with and without the use of multi-function additives.

An experimental study was conducted on 2-stroke/4-stroke two-wheelers and a carburetted passenger car for engine-out benzene emissions from the in-use Indian vehicles, with and without a catalytic converter. The leaded gasoline, used for the study, was having 1.1 % vol. benzene and 16.6 % vol. total aromatics whereas unleaded gasoline was having 2.2 % vol. benzene and 35.2 % vol. total aromatics. Engine-out benzene was found to be linearly related to both, benzene and total aromatics content in the gasoline. Effectiveness of catalytic converter for conversion of the engine-out benzene was also studied. For two-wheelers, the concentration of engine-out benzene seems to be dependent upon the engine type i.e. 2/4-stroke engine and on conversion efficiency of the catalytic converters.

In order to meet progressively stringent regulations on particulate emission from diesel engines, GM has developed and tested a variety of trap oxidizer systems over the years. A particulate trap system for a light duty diesel engine has been selected and developed based on this experience, with particular emphasis on production feasibility. The system components have been designed and developed in collaboration with potential suppliers, to the extent possible. The technical performance of this system has been demonstrated by successful system durability testing in the test cell and vehicle experience in computer controlled automatic operation mode. Although the system shows promise, its production readiness will require more development and extensive vehicle validation under all operating conditions.