Lewis R., Dwyer-Joyce R.S. Automotive Engine Valve Recession

Professional Engineering Publishing Limited, 2002. 156 p. ISBN:186058358X
Series Editor Duncan Dowson. Engineering Research Series.

Contents
Series Editor’s Foreword
Authors’ Preface
Notation
Chapter Introduction
Valves and seats
Valve failure conces
Layout of the book
References
Chapter Valve Operation and Design
Valve operation
Function
Operating systems
Dynamics
Operating stresses
Temperatures
Valve design
Poppet valve design
Materials
References
Chapter Valve Failure
Introduction
Valve recession
Causes of valve recession
Wear characterization
Reduction of recession
Guttering
Torching
Effect of engine operating parameters
Temperature
Lubrication
Deposits
Rotation
Summary
References
Chapter Analysis of Failed Components
Introduction
Valve and seat insert evaluation
Specimen details
Profile traces
Visual rating
Lacquer formation on inlet valves
Valve evaluation
Discussion
Failure of seat inserts in a 1.8 litre, DI, diesel engine
Inlet seat insert wear
Deposits
Misalignment of seat insert relative to valve guide
Inlet valve wear
Conclusions
References
Chapter Valve and Seat Wear Testing Apparatus
Introduction
Requirements
Wear test methods
Extant valve and seat wear test rigs
University of Sheffield valve seat test apparatus
Hydraulic loading apparatus
Design
Test methodologies
Experimental parameters
Motorized cylinder head
Design
Operation
Evaluation of dynamics and loading
litre, IDI, diesel engine
Hydraulic test machine
References
Chapter Experimental Studies on Valve Wear
Introduction
Investigation of wear mechanisms
Experimental details
Specimen details
Test methodologies
Wear evaluation
Results
Appearance of wo surfaces
Formation of wear scars
Comparison with engine recession data
Lubrication of valve/seat interface
Misalignment of valve relative to seat
Effect of combustion load
Effect of closing velocity
Valve rotation
Effect of temperature
Seat insert materials
Experimental details
Valve and seat insert materials
Specimen details
Test methodologies
Results
Conclusions
References
Chapter Design Tools for Prediction of Valve Recession and Solving
Valve Failure Problems
Introduction
Valve recession model
Review of extant valve wear models
Development of the model
Frictional sliding
Impact
Final model
Implementation of the model
Model validation
Engine tests
Bench tests
Reducing valve recession by design
Solving valve/seat failure problems
References
Index