exhaust heat

[6 Gun]

How close can the #2 exhaust pipe be to the inside of cowling with Vans stick on heat foil shield im thinking at 3/16 I may have to wrap pipe with pipe wrap heat shield any advice on the wrap.
Bob

[DanH]

Originally Posted by 6 Gun

How close can the #2 exhaust pipe be to the inside of cowling with Vans stick on heat foil shield im thinking at 3/16 I may have to wrap pipe with pipe wrap heat shield any advice on the wrap.
Bob

3/16" is really close. Are you sure you can't make some change to get more clearance? What brand of pipes?

A 1/16" fiberfrax pad under the Vans stick-on foil works great....a reflector over an insulator.

Don't wrap pipes.

[plehrke]

Originally Posted by 6 Gun

How close can the #2 exhaust pipe be to the inside of cowling with Vans stick on heat foil shield im thinking at 3/16 I may have to wrap pipe with pipe wrap heat shield any advice on the wrap.
Bob

Probable want more then that just for engine movement, heat issue secondary.

[Rupester]

"Don't wrap pipes". They need to shed all that heat to surrounding air. When you wrap them, there's little heat transfer and the metal will fail ... in potentially disastrous ways.
I have a friend who, upon bad advice, wrapped the pipes on his Velocity. At 7000' over STL one sheared off at the cyl head. The engine would not run with all that low-O2 content exhaust air inside the cowl, since the Velocity at that time had no external combustion air intake. He declared an emergency and STL ATCs routed him to an airport. He ended up dead-sticking at that airport some miles north of STL. Aircraft was fine and so was he, but luck was with him. He had to replace all exhaust pipes because all the overheated metal was suspect for future failures.
Like Dan said.