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  1. #1

    Join Date
    Mar 2004
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    yarram, AUSTRALIA
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    muffler presure heat

    os engine tunning does change
    from start of tank to finish
    should we be putting the muffler presure line
    through a heat sink so it dosent heat the fuel in the tank
    the car blokes seem to think it works
    so what about aero

  2. #2

    Join Date
    Mar 2004
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    yarram, AUSTRALIA
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    ps i do run twin clunks
    the old cl uni flow system
    so it is bubleing in the fuel
    not just blowing over the top
    all ansers welcome bax

  3. #3
    Moderator
    Join Date
    Apr 2002
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    Champaign, IL
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    Unless you're running a pump or pressure system that provides consistent pressure to the carburetor, the engine's mixture will change somewhat from when the tank is full to when it's drained. Muffler pressure reduces that effect, but does not eliminate it. Usually, the engine will tend to lean as the fuel level in the tank goes down. That's because there is lower head pressure. Fuel has weight, and the more fuel above the pickup, the more pressure. This can be noticed more if you have a very large fuel tank with respect to the size of the engine. We've don't know of any adverse affects by running muffler pressure right to the fuel tank. Just make your pressure tap in the center to rear of the muffler body, and not hear the header. Adding a way to cool the exhaust before it enters the fuel tank will only add complexity and more points for difficulty.
    Bill Baxter, Manager Hobby Services/Futaba Service/North America
    3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
    Service Phone: 217 398-0007
    Email: hobbyservices@hobbico.com


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