Are loop scavenged 2-stroke engines for recreational purposes able to fulfil future emission limits?

Authors

Ass.Prof. Dipl.-Ing. Dr. techn. Roland Kirchberger, Dipl.-Ing. Dr. techn. Franz Winkler, Univ.-Prof. Dipl.-Ing. Dr. techn. Helmut Eichlseder, Institute for Internal Combustion Engines and Thermodynamics, Graz University of Technology

Year

2010

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 716

Summary

The present technology applied in two-wheeler two-stroke engines is realized by external mixture formation with carburettor. This engine concept – used in displacements between 50cm3 and 500cm3 per cylinder – has to put up with heavy drawbacks concerning torque characteristics and maximum achievable power in order to cope with emission limitations. Due to high scavenging losses, the applied exhaust gas after treatment concepts, often realized via an oxidation catalyst, reach their endurance limit. More severe future emission limits, discussed for 2012 (EURO IV), as well as the planned evidence of endurance, strive for the inevitable change of the system to four-stroke or two-stroke engines with internal mixture formation to achieve a reduction of scavenging losses.

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