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Thread: Powerflow Tuned Exhaust on C23 Sundowner (0-360)

  1. #1
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    Powerflow Tuned Exhaust on C23 Sundowner (0-360)

    To all interested parties,

    During my annual, I was informed that I would need a new exhaust
    manifold. Rather than put on the same old replacement for about $800,
    since I've beeen watching the discussion about Powerflow tuned exhausts
    and trying to squeeze a few extra knots out of a C23, and with them
    becaming available for the 0-360 in May 2008, I decided to go ahead and
    spend the $4400 for the kit.

    I should get 49C back any day now, so stay "tuned" and i'll let you
    know how it performs!

    Paul
    N6349C


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  2. #2
    Guest
    Guest

    Powerflow Tuned Exhaust on C23 Sundowner (0-360)

    --- In musketeermail@yahoogroups.com, "Paul" <paul.sergeant@...>
    wrote:
    >
    > To all interested parties,
    >
    > During my annual, I was informed that I would need a new exhaust
    > manifold. Rather than put on the same old replacement for about
    $800,
    > since I've beeen watching the discussion about Powerflow tuned
    exhausts
    > and trying to squeeze a few extra knots out of a C23, and with them
    > becaming available for the 0-360 in May 2008, I decided to go ahead
    and
    > spend the $4400 for the kit.
    >
    > I should get 49C back any day now, so stay "tuned" and i'll let you
    > know how it performs!
    >
    > Paul
    > N6349C
    >



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  3. #3
    Guest
    Guest

    Powerflow Tuned Exhaust on C23 Sundowner (0-360)

    I took 49C for a run around several local airports to try out the new
    Exhaust and GPS. First Impressions:

    1) The new exhaust looks very impressive, sticking out of the botton
    om the cowling at a very rakish angle. Wonder how much of the extra
    power is from the angled exhaust? I read that when the British
    installed angled exhausts on the the Mark I spitfire, the top speed
    increased bt 20 mph. Of course, that was a 12 cylinder Rolls Royce
    Merlin, not an O-360 4 banger....

    2) And it is much, much noisier.

    3) The engine seems to start a bit easier - perhaps less
    backpressure? It also seems less willing to shut down when I lean it
    out after a flight.

    4) Take off appears more sprightly. I fly out of Mckinney (KTKI),
    which has a 7000 ft runway. Normally on a hot summer day (near 3000
    ft density altitude) I'm rotating just before the 5000 ft remaining
    marker and reach 500ft AGL abeam a white farm house over the far end
    of the runway. Saturday was 95 deg. I rotated about 200 or 300 feet
    earlier, and was at 800 ft AGL across from the farm house. I could
    maintain better than 500 ft climb all the way to 7500 ft MSL, which
    was a density altitude of 9680 ft. Weight was half tanks, my 9 year
    old daughter and myself, so about 350lbs under gross.

    5) Level at 3000 ft MSL and 2500 RPM cruise power, the IAS was (as
    you would expect) unchanged at 105 kts, although presumably fuel flow
    was down. But full power was right at the 2700 RPM red line, and top
    speed was over 120 kts (seemed to average about 124) compared with
    117 before.

    Not very scientific, but my first impression is of more available
    power and a lot more noise.

    Paul (N6349C, 1983 C23 Sundowner)



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