Thermal exhaust wrap
in 912 / 914 Technical Questions
10 years ago
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by Tom Kodey » 10 years ago
Thanks. How much do you wrap? Anything else beyond the exhaust pipes between the header and muffler? Muffler? Tail pipe out of the muffler?
Also, how do you secure the ends of the wrapping? Stainless hose clamps?
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by Roger Lee » 10 years ago
Hi Tom,
Just wrap from where the exhaust pipe exits the cyl. and down to and under the springs. Different aircraft may have different lengths of exhaust pipe. You dampen the wrap cloth (not soaking it) and go around 1.5 turns at the beginning of the wrap and apply a hose clamp. Then only over wrap each spiral wrap edge 3/8" as you warp down the pipe. Do not over wrap by more than this because too much over wrapping will cause too much heat retention in the pipe. Even though these are stainless steel pipe they do have their limits. I wrap down to the springs then go under the springs leaving them exposed. 1-2 wraps under the spring and then put a clamp in place to hold it in place. Do not put wrap over the springs and there is no need to wrap the muffler. If you have a tad of blow-by at the knuckle under the spring and can't get it sealed other ways this will take care of that too.
If you have EGT probes do not over wrap these. The cloth seems to affect the readings and it can cause temps to bounce up and down 100F. There is something in the cloth that affects the probe and no one seems to know what. Wrap up to an EGT probe and clamp it. Then start again on the other side.
The wrap is 2" wide. It can be purchased at many automotive stores. It comes in a 50' roll for about $50. Enough to do 2-3 planes. In most planes I use approximately 54"-58" of cloth per pipe.
Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell
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by Tom Kodey » 10 years ago
Thanks, Roger. Big help ...
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