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Unread 08-20-2007, 05:27 PM
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tstrohmayer tstrohmayer is offline
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Default SCAT Connections

There's been a bit of confusion in the past regarding the routing of the SCAT tubes with our second generation exhaust systems (PFS-14150 and PFS-14151). The first generation system (PFS-14140) was a bit simpler, but that's the price of progress.

To begin with, as is the case with all of our exhaust systems, if there is a perforated screen beneath the flange on the heat shroud, that flange is for carb heat only. In the case of the Cherokee, this is a 3.0 inch flange on the copilot side of the exhaust.


That only leaves two mystery flanges left. One 3.0 flange on the back, pilot side, and one 2.5 inch flange on the bottom. This is where it gets tricky. The smaller (2.5 inch) flange is the outlet tube. This is where hot air exits the exhaust collector assembly and needs to travel to your cabin (or get dumped overboard in the summer). We supply a length of 2.5 inch SCAT hose (SCAT-10) to use with this connection. Connect one end of the hose to this outlet on the shroud and connect the other end to the 2.5 inch side of the splitter (P/N 6584) we provided. The splitter can reside wherever is most convenient. Use some wireties to secure it. We recommend tying it to the tubular engine mount structure.

This splitter will have three remaining ports. The 2.0 inch diameter port will always connect to the cabin heat valve on your lower firewall. Use the piece of 2.0 inch SCAT-8 we provided. The two smaller (1.0 inch) ports are for your defroster vents. Some aircraft have two connections, some have one. Use the 1.0 inch SCAT-4 hose we have provided. If you have one connection, cap the second 1.0 inch port. We recommend using a piece of the silicone material from a large diameter SCAT tube with a hose clamp.

One hose to go. There is one flange left on the exhaust collector assembly. This is the fresh air inlet. If you have a PA28-140, use the very long piece of 3.0 inch SCAT-12 to connect this flange to the flange behind your number three (copilot side, aft) cylinder. This is the same for most other PA28 aircraft as well. If you have a PA28-150, -160, or -180, you might not have this three inch connection behind your number three cylinder. If this is the case, use the reducer we supplied you to attach this 3.0 inch SCAT hose to the 2.0 inch connection behind your number four cylinder (pilot side aft).

Now preheat your oven to 425 to heat the garlic bread for 20 min. After all, that's a lot of spaghetti in there.
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Last edited by tstrohmayer; 08-22-2007 at 09:05 AM.
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Unread 08-21-2007, 10:53 PM
dtilman dtilman is offline
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Default Scat hoses connections on a PA 28

Tom,

Can you post some pictures showing the various hose connections you are talking about?
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