INFLUENCE OF AUXILIARY EXHAUST VALVE WITH VARIABLE TIMING ON SPARK IGNITION ENGINE PERFORMANCE

Ahmed, S.A.; Ibrahim, A. M.; Wassef, F. M.; Selim, H.

doi:10.21608/jesaun.2010.124379

INFLUENCE OF AUXILIARY EXHAUST VALVE WITH VARIABLE TIMING ON SPARK IGNITION ENGINE PERFORMANCE

Document Type : Research Paper

Authors

¹ lecture assistant - Mechanical Engineering Department, Faculty of Engineering, Assiut University, 71516 Assiut

² Mechanical Engineering Department, Faculty of Engineering, Assiut University, 71516 Assiut

10.21608/jesaun.2010.124379

Abstract

New Variable valve timing strategy based on using auxiliary valve having variable timing (VVT) is used in this study. The valve is driven by a new variable valve timing mechanism constructed for this purpose. The auxiliary valve acts as an exhaust valve and the experiments and simulation model are carried out at different loads. The results show that engine performance is improved at full load and worsens at part loads. The study proves that using an auxiliary exhaust valve having variable timing is not recommended in engines applications.

Main Subjects