Friday, May 4, 2018

Automotive Engine Valve Recession by Duncan Dowson

Automotive Engine Valve Recession by Duncan
Chapter 1 Introduction 
Chapter 2 Valve Operation and Design
Chapter 3 Valve Failure
Chapter 4 Analysis of Failed Components
Chapter 5 Valve and Seat Wear Testing Apparatus
Chapter 6 Experimental Studies on Valve Wear
Chapter 7 Design Tools for Prediction of Valve Recession and Solving Valve Failure Problems
Valve wear has been a serious problem to engine designers and manufacturers for many years. Although new valve materials and production techniques are constantly being developed, these advances have been outpaced by demands for increased engine performance. The drive for reduced oil consumption and exhaust emissions, the phasing out of leaded petrol, reductions in the sulphur content of diesel fuel, and the introduction of alternative fuels such as gas all have implications for valve and seat insert wear. This book aims to provide the reader with a complete understanding of valve recession, starting with a brief introduction to valve operation, design, and operating conditions such as loading and temperature. A detailed overview of work carried out previously, looking at valve and seat wear, is then given and valve and seat failure case studies are discussed. A closer look is then taken at work carried out at the University of Sheffield, UK, including the development of purpose-built test apparatus capable of providing a simulation of the wear of valves and seats used in automotive engines. Experimental investigations are carried out to identify the fundamental valve and seat wear mechanisms, the effect of engine operating parameters on wear, and to rank potential new seat materials. An important aspect of research is the industrial implementation of the results and the provision of suitable design tools. A design procedure is outlined, which encapsulates the review of literature, analysis of failed specimens, and bench test work. This includes a semi-empirical model for predicting valve recession run in an iterative software programme called RECESS, as well as flow charts to be used to reduce the likelihood of recession occurring during the design process and to offer solutions to problems that do occur.
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