Euro II Calibration of Direct Injection SCIP™ Technology on 50 cc Two-stroke Two-wheelers

IFP has developed a simplified Direct Injection technology, named SCIP™, derived from the well known IAPAC® technology without the need of additional camshaft. This technology has been integrated with the MC500 Engine Management System developed by SAGEM for the growing 2-wheelers application. The final simple and cheap product is therefore well adapted to small displacement 2-stroke engines as 50cc engine for 2-wheelers application.

This paper presents the development of a 50 cc scooter engine using SCIP™ technology and the calibration of the MC500 System to achieve Euro II regulation. The very low emissions level required for Euro II is achieved by combining SCIP with a small oxidation catalyst converter, although there is no need for Euro I. Achieved results are a reduction in CO reaching 70% below Euro II level, more than 30% margin on HC + NOx level and a fuel consumption close to 2 liters/100km (25 to 40 % improvement compared to conventional carbureted 50 cc 2-stroke mopeds).

Compared to its 4-stroke counterpart technology (which will also become more and more sophisticated to meet future stringent emissions regulations), the Direct Injection 2-stroke technology is therefore an efficient and cost-effective way of meeting future European regulations while keeping the 2-stroke engine intrinsic advantages of simplicity, compactness and high specific power.