Pacifica - Dual Exhaust Suggestion

Discussion in 'Pacifica' started by Nomen Nescio, Oct 26, 2003.

  1. Nomen Nescio

    Nomen Nescio Guest

    per Art Begun:
    Art, the Pacifica may need more power, but dual exhaust is not the answer.
    Dual exhaust is going to add a lot of weight with extra exhaust piping, cat
    converter, muffler, and resonator. This will make the car slower, not

    It was the de rigueur for high performance motorcycles like the Royal
    Enfield to have dual pipes. But, have you noticed that the best bikes
    today like the Ducati only have one exhaust? And slugs like the Harley lug
    around two. Duals may look nice and sound nice, but they are so retro.

    For the Pacifica, one large pipe big enough to carry out the exhaust
    without back pressure is lighter than two of equal capacity. In this case,
    D-C has made the correct choice going with a single exhaust of adequate
    size. You will also note that exhuast restriction plays a secondary role to
    induction restriction; that is why a TURBO gives you so much more a boost
    than duals could any day of the week. But a TURBO is going to cost a lot
    because when Chrysler first starting doing turbos, they used an Air-Garrett
    with OIL AND WATER cooling. The Air-Garrett was bullet proof. Insist on
    Air-Garrett for a trouble-free turbocharger installation.
    Nomen Nescio, Oct 26, 2003
  2. Maybe maybe not.
    Student Mechanic where do you get your ideas from? You know even less
    about motorcycles than you do cars.

    Hi Pro motorcycles have one pipe because the entire exhaust system is
    tuned to the upper power band. Bike engines have to be small and light
    and powerful, and the faster you can spin the crank the more explosions
    per second you can get, thus the more power, so designers can only meet
    the power demands on a small engine by spinning them faster and designing
    everything accordingly. At these higher RPM's the exhaust system can
    scavenge if the system is tuned for it, in short not only is there no back
    there's actually a negative pressure there in part of the exhaust cycle that
    literally sucks the exhaust right out.

    Car exhaust systems are not tuned, at least not the entire system. The
    can be but the cat-con and muffler prevent the rest of the line from being
    and in addition people and
    municipalities would not tolerate the loudness of a tuned exhaust. Bikes
    get away with this because there's fewer of them and people expect
    to be noisy. Also, car exhaust has to be dumped at the rear bumper or you
    can suck it into the passenger compartment, thus the exhaust line has to be
    much longer than optimal for tuning. Finally, the benefits of a fully tuned
    vs just tuning the headers aren't that much better.

    Because of this, the better flowing the exhaust is, the less backpressure.
    that 2 smaller pipes flow less than 1 bigger one, but 2 bigger pipes flow
    even better
    than 1 pipe of the same diameter. So while putting dual exhausts on a car
    may not
    gather that much more power, it's always better than a single exhaust,
    equal sized pipes.

    Ted Mittelstaedt, Oct 27, 2003
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