Abstract:

This field test was performed in order to validate the viability of a commercial retrofit technology to convert carbureted two-stroke engines to direct in-cylinder fuel injection. Envirofit’s retrofit technology employs the Orbital Combustion Process™ (OCP), simply described as an air-assisted direct fuel injection system. A field trial of 13 Philippine tricycle taxis was executed between May and December of 2005. The main priorities of the testing were the validation of components and system calibration, characterization of each vehicle’s performance with regard to emissions and fuel efficiency, and the development of a repeatable retrofit installation process.

The converted vehicles were all Kawasaki HDIII 125cc (9 KW) carbureted motorcycles between 3 and 9 years old, fitted with sidecars. Each unit was in active taxi service prior to this field test. Vehicle weight varied between 400-800kg based on side car configuration, and daily distance traveled varied from 40-80km depending on location. The total distance covered by all the units during the field test was just over 71,000 km. In-use fuel economy showed an average increase of 34.8% in efficiency. Hydrocarbon and Carbon Monoxide emissions reductions were 89.0% and 76.4%, respectively, based on a weighted average, steady-state, 6 point drive cycle.

Presentation: http://www.cleanairnet.org/baq2006/1757/docs/SW16_2.ppt