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RV-7A Construction Log
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Date:  10-7-2017
Number of Hours:  1.00
Manual Reference:  
Brief Description:  Exhaust Heat Muff 2

I had already cut the flexible duct planning to put the muff on the tail pipe and now it didn't fit so I needed to either buy a new duct which are expensive or splice this one back together. So I bought a 2 inch aluminum piper for a couple bucks and spliced the duct together.

I installed the muff per plans.
Installed the flexible duct, one with a splice in it.
Fastened the cuts to the intake pipes.

I didn't attach the duct to the engine mount because I want the ducts to vibrate with the engine. There is some play in the duct that runs from the muff to the cabin inlet.

I also installed three heat shields on the exhaust pipes to hold the duct material from touching the exhaust pipe.

I tested this configuration with a vaccuum and it seems to blow air thru just fine.
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splice pipe

splice pipe

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Installed muff

Installed muff

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Installed ducts

Installed ducts

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