INVESTIGATION OF LOW END TORQUE DIP PROBLEM OF CAMPRO 1.6L ENGINE

Document Type : Original Article

Authors

1 Professor, Dpt. of Mech. Engineering, International Islamic University Malaysia.

2 Asst. Prof., Dpt. of Mech. Engineering, International Islamic University Malaysia.

3 Grad. student, Dpt. of Mech. Engineering, International Islamic University Malaysia.

Abstract

ABSTRACT
The main objective of this work is to perform an extensive study on the causes of the
torque dip in CAMPRO engine and subsequently to provide the best solution that will
improve the performance, reliability as well as production cost. CAMPRO engine is a
basic Double Overhead Camshaft (DOHC) which has a capacity of 1597 cc and
installed with a total of 16 valves developed by Malaysian car manufacturer PROTON in
the year 2000.The CAMPRO engine experiences performance downfall when it
reaches at certain rpm. The phenomenon is known as torque dip or torque loss where
the output torque is not smooth, consequently formed a dip in the torque curve. The dip
which occurs at 2500 – 3500 rpm is mainly influenced by the geometry of the designed
intake manifold and valve timing. Analysis is mostly confined on the intake manifold
geometry and the valve timing. Two possible solutions viz., dual length intake manifold
and variable valve timing are analyzed.

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