Development of Valve Seals for Turbocharged Compression Ignition Engines

940588

03/01/1994

Event
International Congress & Exposition
Authors Abstract
Content
New emission requirements for compression ignition engines have led engine designers to review the attributes of positive valve stem seals. Federal standards for particulate emissions were initiated in 1988 for heavy duty diesel engines in the United States. Since then, the standards on particulates have been significantly reduced from .6 g/kW*hr in 1988 to .1 g/kW*hr for 1994 [1]*. Lowering particulates, improving oil economy and reducing guide wear have all become important issues in the heavy duty engine marketplace. All of these factors are affected, in part, by the amount of oil flowing thru the clearance between the valve guide and valve stem. Bench tests indicate that heavy duty valve seals could reduce overhead oil consumption by as much as 99% during idle/motoring conditions and lower particulate emission levels contributed by lube oil up to 75%. In addition, they can significantly reduce guide wear and valve stem scuffing under turbocharged conditions.
Meta TagsDetails
DOI
https://doi.org/10.4271/940588
Pages
9
Citation
Marlin, P., Fiedler, D., and Bruns, I., "Development of Valve Seals for Turbocharged Compression Ignition Engines," SAE Technical Paper 940588, 1994, https://doi.org/10.4271/940588.
Additional Details
Publisher
Published
Mar 1, 1994
Product Code
940588
Content Type
Technical Paper
Language
English