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Thread: SCAT tube routing for exhaust heat muff

  1. #1
    Gordon Misch's Avatar
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    SCAT tube routing for exhaust heat muff

    Ok, so here is my dumb question of the week.

    I'm installing an Atlee Dodge PA-18-150 crossover exhaust on my PA-12-150, and have no experience with this setup. Also don't have any similar nearby to go look at. So - - I need some help.

    There are three heat muff sections. One is in front of the oil sump, and two are behind the sump on the muffler. One of the behind two (that are on the muffler) is on the left, and the other is on the right. the one on the right is a little shorter, and extends down on the exhaust outlet stack.

    What section goes to what? How are the SCAT tubes routed? I will GUESS that the front one goes to carb heat, but the other two? I'd assume cabin heat, but??? One to the pilot and one to the passenger????

    Picture(s), along with description, would be wonderful!

    Thank you!!
    Gordon

    N4328M KTDO
    My SPOT: tinyurl.com/N4328M (case sensitive)

  2. #2
    www.SkupTech.com mike mcs repair's Avatar
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    not sure of your discription, but I'll try

    you have 3 2" fittings on bottom schroud,

    the bottom one down on stack is goint to carb for carb heat.
    the middle one pointing down got to your cabin heat box...
    the left end one is going to bottom cowl for inlet air for the cabin heat side..

    on the top schroud on right end you have the inlet air for carb heat, goes up to back of right rear baffle of such.....

    close?

  3. #3
    www.SkupTech.com mike mcs repair's Avatar
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    i thought it showed better in my making breather tube video, but not really,

    but at least you can see muffler mounted to it...


  4. #4
    StewartB
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    All i've got from where I sit. Hope they help.

    SB
    Attached Images Attached Images

  5. #5
    Gordon Misch's Avatar
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    Mike, yes close. For perspective, I bought this exhaust system used from the SC.org classifieds. The stacks and the top-rear shroud are stamped F.A. Dodge (mfg stamp) and the stacks are yellow-tagged by F.A. Dodge.

    There are 4 2" fittings on the bottom shroud. One looks like it was added after manufacture, because it is a conventional-looking fitting welded onto a curved piece that lies neatly on the shroud, is siliconed onto the vertical outlet stack part of the shroud, and it faces forward. The others are as you describe ( I think). Two are on the L.H. section of the muff, facing down, and one is on the R.H. section, facing up., and one that looks original is on the outlet stack portion facing forward and left. So the fourth one (the one that looks like it was added after manufacture) is a mystery?

    There are two crossovers in front of the oil sump. One of them has a shroud over it. I still don't have a good guess as to what that one might be for?
    Last edited by Gordon Misch; 04-22-2011 at 11:23 PM.
    Gordon

    N4328M KTDO
    My SPOT: tinyurl.com/N4328M (case sensitive)

  6. #6
    Gordon Misch's Avatar
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    Stewart, yes that helps. Thank you. Two questions:

    I see a piece of SCAT tube attached to the muff in front of the oil sump. Where do it and its counterpart lead?

    I see, on your firewall, what looks like a housed control cable in the foreground. Is that the cabin heat control?

    I'm in the process of figuring out firewall penetrations and FWF control, instrumentation-wiring, power-wiring, and heat duct routings. And cowl supports. Must be easy for those who do it for a living, but for this amateur it's quite the puzzle! I really do appreciate the input!! Fair warning - I'll probably be asking for more help!
    Gordon

    N4328M KTDO
    My SPOT: tinyurl.com/N4328M (case sensitive)

  7. #7
    StewartB
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    I won't be able to get more pics for a week or so. I'm sure somebody will steer you right by then. WHile the others are encroaching on Alaska, I'm heading to Texas and some time with the kiddo. Happy Easter.

    Stewart

  8. #8
    Iflylower's Avatar
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    Call atlee. They'll answer questions and will want it set up right. Plus, they're good guys - no matter what John Meede says!

  9. #9
    Gordon Misch's Avatar
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    "encroaching" Yep, I do remember having concurred with that way of thinking. Cruise ships, go away! Funny! Have a grand trip, Stewart!
    Gordon

    N4328M KTDO
    My SPOT: tinyurl.com/N4328M (case sensitive)

  10. #10
    Gordon Misch's Avatar
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    Good point flylower - thanks for the reminder.
    Gordon

    N4328M KTDO
    My SPOT: tinyurl.com/N4328M (case sensitive)

  11. #11
    StewartB
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    Crossover muff (Pre heater?)- one scat to a chin scoop on right side, one scat to muffler shroud on left side ( forward facing). Other outlet in center bottom of muffler shroud to cabin heat box, shroud outlet is straight down near center. Upper left baffle feeds another muff shroud inlet as seen in photo. Tailpipe shroud feeds carb heat. Yes, the cable is cabin heat control.

    Stewart

  12. #12
    Gordon Misch's Avatar
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    Aha! Thank you, Stewart! Now I understand. REALLY enjoy your trip, especially the time with your daughter.
    Gordon

    N4328M KTDO
    My SPOT: tinyurl.com/N4328M (case sensitive)

  13. #13
    www.SkupTech.com mike mcs repair's Avatar
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    added atlee rear seat heat "heat robber" down on stack?

  14. #14
    www.SkupTech.com mike mcs repair's Avatar
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    Quote Originally Posted by StewartB View Post
    I won't be able to get more pics for a week or so. ...I'm heading to Texas and some time with the kiddo. Happy Easter.

    Stewart
    I will have to get some of your door smoke seal when you return then...

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