The advantages of high power to density ratio and low manufacturing costs of a two-stroke engine compared to a four-stroke unit make it currently the most widely used engine type for 50cc displacement 2-wheelers. This dominance is threatened by increasingly severe exhaust emissions legislation, forcing manufactures to develop their two-stroke engines to comply with the legislation. This paper describes a simple solution to reduce these harmful emissions in a cost effective manner, for a scooter application. The method of stratified scavenging is achieved by delivering the fuel into the rear transfer passage from a remote mechanical fuel metering device, operated by intake manifold pressure. Air only is delivered into the cylinder from the remaining transfer passages which are directed towards the rear transfer port, thus impeding the fuel from reaching the exhaust during the scavenging process. An experimental evaluation of the concept has shown a reduction in unburned hydrocarbons of 65% and a reduction in brake specific fuel consumption of 20%.
Stratified Scavenging Applied to a Small Capacity Two-Stroke Scooter for the Reduction of Fuel Consumption and Emissions
Sae Technical Papers
Small Engine Technology Conference & Exposition ; 1999
28.09.1999
Aufsatz (Konferenz)
Englisch
Development of a stratified scavenging system for small capacity two-stroke engines
Kraftfahrwesen | 1999
|Development of a Stratified Scavenging System for Small Capacity Two-Stroke Engines
SAE Technical Papers | 1999
|Reduction of Fuel Consumption and Emissions for a Small Capacity Two-Stroke Cycle Engine
SAE Technical Papers | 1993
|Reduction of Fuel Consumption and Emissions for a Small Capacity Two-Stroke Cycle Engine
Kraftfahrwesen | 1993
|