Comparison between Unleaded Automobile Gasoline and Aviation Gasoline on Valve Seat Recession in Light Aircraft Engines

Abstract

Testing was conducted to determine the potential for excessive valve seat recession in light aircraft engines using unleaded automobile gasoline (autogas) fuel. Two IO320 Lycoming engines were operated on a test stand for a 150-hour duration; one engine used 100LL aviation gasoline (avgas) and the other used unleaded premium autogas. New original equipment manufacture valve seats (hardness Rockwell HRB 40) were installed at the beginning of the test and recession was measured at 16-hour intervals. The air-fuel mixture was precisely controlled by monitoring exhaust gas composition. Results show valve seat recession using unleaded autogas fuel was not significantly different from 100LL avgas.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1989
Accession Number
ADA218743

Entities

People

  • Jerry R. Allsup

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Aircraft Engines
  • Alkanes
  • Aviation Gasoline
  • Carbon Monoxide
  • Detectors
  • Dielectric Gases
  • Engines
  • Exhaust Valves
  • Fuels
  • Gasoline
  • Heat Transfer
  • Intake Valves
  • International Airports
  • Lubricating Oils
  • Measurement
  • Metals
  • Physical Properties

Readers

  • Internal Combustion Engine (ICE) Technology.