Max Outboard Exhaust Temperature passing thru hub of prop

Discussion in 'Outboards' started by gcarmich, Jan 9, 2018.

  1. gcarmich
    Joined: Aug 2009
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    Location: Arlington, VA

    gcarmich New Member

    Does anyone know the max temperature at max RPM of the exhaust gases when they pass through the hub of the outboard prop? I understand that they can be up to 1200 degrees F when exiting the cylinder head but they cool quickly. Most props have a rubber hub and I believe basic rubber loses effectiveness around 300 degrees F. - this might indicate a possible temperature max.
  2. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    It is way below the boiling point for water.
  3. PAR
    Joined: Nov 2003
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    Location: Eustis, FL

    PAR Yacht Designer/Builder

    Temperatures are in the 150 degrees range at sustained WOT on a lean tune. If running rich, a little cooler. The hub isn't a "basic rubber" formulation either.
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