A Comparison of Hydrocarbon Emissions from Different Piston Designs in an SI Engine

The total hydrocarbon emissions and the distribution of hydrocarbon species from the emissions of two different piston and cylinder liner designs;

1. 1
   reduced top land height,
2. 2
   smoother cylinder bore,

were compared with a standard production Rover K16 spark ignited engine. Reductions in total HC emissions were achieved for both designs. The variations between the relative quantities of a selection of the most significant species were investigated for each design, considerable differences were observed between these design changes.