New PM valve seat insert materials for high performance engines

Akira Fujiki, Makoto Kano

Research output: Chapter in Book/Report/Conference proceedingConference contribution

14 Citations (Scopus)

Abstract

Internal combustion engines experience severe valve train wear and the reduction of valve seat and seat insert wear has been a long-standing issue. In this work, worn valve seats and inserts were examined to obtain a fundamental understanding of the wear mechanisms and the results were applied in developing new valve seat insert materials. The new exhaust valve insert material for gasoline engines is a sintered alloy steel containing Co-base hard particles, with lead infiltrated only for inserts used in unleaded gasoline engines. The new intake valve insert material for gasoline engines is a high-Mo sintered steel, obtained through transient liquid phase sintering and with copper precipitated uniformly. This material can be used for both leaded and unleaded gasoline engines. Valve and valve seat insert wear has long been an issue of concern to engine designers and manufacturers. Although new PM (powder metallurgy) techniques for producing seat inserts have been introduced, 1), 2), 3) and 4) their advantages have been outpaced by demands for improved engine performance.5) These demands include higher horsepower, lower fuel/oil consumption, and longer maintenance-free life. The authers have been involved in the development of new maintenance-free engines for years. In developing these engines, it has been necessary to develop new valve seat insert materials. In the process of developing new PM valve seat insert materials, engines under development have first been built and operated with extant valve seat inserts. Investigations were then made of worn valve seats and inserts, and the results obtained were applied in developing new valve seat insert materials.

Original languageEnglish
Title of host publicationSAE Technical Papers
DOIs
Publication statusPublished - 1992
Externally publishedYes
EventInternational Congress and Exposition - Detroit, MI
Duration: 1992 Feb 241992 Feb 28

Other

OtherInternational Congress and Exposition
CityDetroit, MI
Period92/2/2492/2/28

Fingerprint

Die casting inserts
Powder metallurgy
Engines
Gasoline
Wear of materials
Seats
Intake valves
Liquid phase sintering
Fuel oils
Alloy steel
Internal combustion engines
Lead
Copper
Steel

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering

Cite this

New PM valve seat insert materials for high performance engines. / Fujiki, Akira; Kano, Makoto.

SAE Technical Papers. 1992.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Fujiki, A & Kano, M 1992, New PM valve seat insert materials for high performance engines. in SAE Technical Papers. International Congress and Exposition, Detroit, MI, 92/2/24. https://doi.org/10.4271/920570
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