"Scott" wrote in message
...
Bob wrote:
To All:

Annd if
you've done like most of us and wrapped an over-stretched screen-door
spring around the exhaust stack, odds are it rusted itself into FOD
during the Eisenhower administration.


-R.S.Hoover

Yes, I was concerned about the doorsprings corroding and breaking pieces
off to be ingested into the carburetor since there isn't any sort of
filter in the "warm" air path between the heat muff and the carb airbox...

One thing that is different on my system now (since my recent top
overhaul) is the addition of an air inlet on the engine baffle between the
nosebowl and the cylinder (pilot side) with tubing running from it to the
heat muff. My old system just had the inlet pipe of the Aeronca heat muff
unconnected to anything and I noticed that the aluminum heat muff looked
like it had melted a bit where it was contacting the exhaust pipe so I
added the cool air inlet to help cool the heat muff a bit. Maybe it cools
it too much and I'm just not getting enough heat, so increasing the
surface area sounds like a good idea...just unsure of the method. I know
I DO NOT want FOD running into the carb as that is SURE to cause the
engine to react [not so] funny



Scott

Aha!

I read your post this morning and didn't think much about it at the time;
but but it now occurs to me that the cooling air gains a lot of heat passing
through the cooling fins of the engine--so that you may have created your
own problem by sending cold outside air directly into the heat muff.

Just a thought.

Peter