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Michaels Web Site
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Date: 1-4-2020
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Number of Hours: 0.00
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Manual Reference:
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Brief Description: Cabin Heat 2.0 Pg 1 of 3
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I'm giving a new heat muff a try to attempt to get cabin heat. I had my own heat muff for years that I tinkered with, but never got it to work. I never put out heat during the winter. It is a VW, so they are not known for putting out heat in the winter!
Another Sonex/Aerovee owner said he tried this heat muff and it was working for him, so I'm giving it a try. I'm calling it version 2.0. TIME TO INSTALL WAS 1 HOUR FOR THE MUFF, 2 HOURS FOR THE SCAT, AND ANOTHER 1 HOUR FOR THE NEW HEADER WRAP.
It's a custom made muff and is sold through Aircraft Spruce (search for "TURBO HEAT CABIN HEAT MUFF"), but this is the web site of the guy that makes it:
https://customweldingproducts.com/products/ . $174 in 2020.
The typical muffs are for exhaust tubes that are larger in diameter, so you need to add a remark when ordering, that you want the 1-3/8" diameter version.
My muff was square and only fit down where the #4 exhast met the #3 exhaust. This one is round so it fits closer to the exhaust port. Maybe this will provide more heat. The muff in this location BARELY fits under the forward pushrod tube. I left enough space to get some header wrap in there.
At the "out" side this muff has a removeable restrictor with 9 holes in it (see photos 1 and 2) to help slow down the air before exiting the muff, to help build up heat. The idea is you can drill out the holes if you need more air exiting. On the following pages you'll see more of this restrictor, and the hole in the baffle for the supply air from the engine.
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New heat muff on #4 exhaust. Restrictor visible at left.
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This version is closer to the exhaust port
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2" scat tubing on "in" flange.
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