Lewis, R. and Dwyer-Joyce, R.S. (2003) Combating automative engine valve recession. Tribology and Lubrication Technology, 59 (10). pp. 48-51. ISSN 0024-7154Full text available as:
[INTRODUCTION] Valve recession occurs when wear of the valve or seat inserts in an automotive engine has caused the valve to sink or recede into the seat insert (as shown in Figure 1). Excessive recession leads to valves not seating correctly and cylinder pressure loss. Leaking hot combustion gases can also cause valve guttering or torching, which will accelerate valve failure.
Although new valve materials and production techniques are constantly being developed, these advances have been outpaced by demands for increased engine performance and wear related problems remain an issue. Dynamometer engine testing is often used to establish short-term solutions. This is time consuming and does not necessarily reveal the actual causes of wear.
A long-term approach is required in order to understand fundamental wear mechanisms and the effect of varying engine operating conditions or design changes to the valve train. This information can then be used to develop tools for predicting wear and for solving problems more quickly if they do occur. In this case study, such tools were developed using a combination of component failure analysis, bench test work and wear modelling.
|Copyright, Publisher and Additional Information:||This is an author produced version of a paper published in Tribology and Lubrication Technology. This paper has been peer-reviewed but may not include the final publisher proof-corrections or journal pagination.|
|Institution:||The University of Sheffield|
|Academic Units:||The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Mechanical Engineering (Sheffield)|
|Depositing User:||Repository Officer|
|Date Deposited:||23 Nov 2005|
|Last Modified:||07 Jun 2014 17:04|