ISSN: 2319 – 8753 International Journal of Innovative Research in Science, Engineering and Technology Vol. 1, Issue 2, December 2012 Copyright to IJIRSET www.ijirset.com 173 Failure Analysis of Internal Combustion Engine Valves: A Review Naresh Kr. Raghuwanshi 1 , Ajay Pandey 2 , R. K. Mandloi 3 Department of Applied Mechanics, M.A.N.I.T., Bhopal, Madhya Pradesh, India 1 Department of Applied Mechanics, M.A.N.I.T., Bhopal, Madhya Pradesh, India 2 Department of Mechanical Engineering, M.A.N.I.T., Bhopal, Madhya Pradesh, India 3 Abstract: Intake and exhaust valves are very important engine components that are used to control the flow and exchange of gases in internal combustion engines. They are used to seal the working space inside the cylinder against the manifolds; and are opened and closed by means of what is known as the valve train mechanism. Such valves are loaded by spring forces and subjected to thermal loading due to high temperature and pressure inside the cylinder. The present study focuses on different failure modes of internal combustion engine valves, failures due to fatigue at high temperature, high temperature effects on mechanical properties of materials, like hardness and yield strength; wear failure which is due to impact loading, and wear rate that depends on load and time. For the study of fatigue life, a combined S-N (max. stress v/s number of cycles) curve is prepared. Such a curve helps in comparing the fatigue failure for different materials at different high temperatures and may also assist the researchers in developing the valve materials with a prolonged life. Keywords: Failure, Internal Combustion Engine Valves, High Temperature, Fatigue, Wear. I. INTRODUCTION Internal combustion engine valves are precision engine components. They open and close as and when needed. The fresh charge (air - fuel mixture in Spark Ignition Engines and air alone in Compression Ignition Engines) is induced through inlet valves and the products of combustion get discharged to atmosphere through exhaust valves. They are also used to seal the working space inside the cylinder against the manifolds [1]. There are different types of valves used by the manufactures; some common types of valves being poppet valves, slide valves, rotary valves and sleeve valve. The basic nomenclature used for valves is as shown in Figure 1. Fig. 1 The basic nomenclature of engine valve. Source: H.J.C. Voorwalda et al. (2011) [2]