Messages In This Thread

• Muscle cars and Charles Kettering. *NM* *LINK*
  • Good stuff, David! This explains the origin of the old wives' tale that aviation fuel is good for high performance automotive use *NM*
  • Avgas can have up to 115 octane. The best you can get at a gas station these days is around 93. So, if you have a very high compression car engine, avgas might be a good fuel to use in it. You won't find many '60s 440s or 427s that will run well on 93 octane, so you have to
    • Avgas contains a lot of de-icing agents and is formulated for constant, moderate load, medium RPM operation. Even though it has a high octane rating, it is not good for automotive engines. I was told this by a Union 76 fuel specialist. *NM*
      • Usually avgas is mixed with normal gas to get the octane rating desired. People do it all the time, so it can't be all that bad. Don't forget, most of these cars we are speaking of are driven 1/4 mile at a time, or are just cruisers. *NM*
        • Remember, that today's fuel ratings are different than 'the day' - the puimp number is road octane + motor octane / 2
          • The highest we can get around here is 91. The strange thing is I can detect a difference between 87 and 89. My LFX 3.6L runs much better on 89 mid-grade than 87 regular. However, the difference between 89 and 91 not so much. Weird. *NM*
            • There does seem to be an improvement. We had the 2.0T Equinox...
  • I remember when people started trying boat fuel in their cars too for higher octane. That fuel has special chemicals in it to - not for cars. *NM*
  • Oh, for the days of yore, when Sunoco 260 was the 'hot' fuel.... *NM*
  • The anti-knock additives decrease the volatility to slow the combustion process - sometimes too much and the burn is less complete in the chamber