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jareds(at)verizon.net
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 Posted: Mon Feb 26, 2007 7:29 pm Post subject: 582 Exhaust Fumes |
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Just wanted to get an idea from the 582 flyers how many have a fully
closed cowling in front?
I have the "Radial" look with a monster opening in the front. I have
struggled with exhaust fumes getting into the cockpit. I have limited
the airflow a bit but am considering closing off all the front of
cowling except around the prop shaft. I have read that the input
pressure in the engine compartment may be too much with only a little
outlet at the bottom and no where for fumes to go. C02 detector used to
get pretty high until i put some harley building skills to use by using
header wrap around the muffler links and putting plastic paper inside
the firewall.
1 Any thoughts on closing the cowl front completely.. any disadvantages
like heat dispation?
2 Do you think this will cure the fumes issue?
Thanks in advance to all the good ideas i'm sure i'll be getting.
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eskflyer(at)lvcisp.com
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| Posted: Mon Feb 26, 2007 8:35 pm Post subject: 582 Exhaust Fumes |
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I had the same thing happening and did almost like you . i used high temp
muffler wrap on the joints . I still had high co2 readings . I then closed
in and wraped the bungee area thru the floor and now no CO2 at all in
cockpit . It was sucking in the fumes from underneath and flowing thru the
cockpit. I used soft rubber sheet and made it fit tite to the bungees use
screws to hold in place thru the aluminum plate in the bungee area .
JP
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Tue Feb 27, 2007 5:06 pm Post subject: 582 Exhaust Fumes |
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The fellow who built my plane left a good size opening along th4e bottom of
the aft cowl to allow air coming in the front to escape.
If there is any problem with that set up it is the space between the front
Fake Townsend ring and the rear cowls. This can create a lot of turbulence
over the rear cowls which can effect your cruise speed. There are others on
this list who can speak about this with a lot more authority than I can.
I do however think the length of your exhaust pipes is very important. If
they are too short fumes can be sucked in through the bungee openings. I
expect there may also be smaller openings along the bottom of the fuselage
on aircraft that sport the Grove spring gear.
I am surprised that no one, myself included, hasn't tried fitting an
extruder pipe to the exhaust. What it effectively does is creates an
envelope of cold air around the hot exhaust. This will make the engine
exhaust a lot quieter with absolutely no back pressure. BTW this is the
same technology used in the first generation "Hush jets"! DHC Beavers and
some Pipers (Aztec) have been using extruders for years. Actually I think
you will find the extruders on the Aztec works so well they didn't bother
with an exhaust silencer.
Noel
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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