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SIDESLIP
Joined: 14 Oct 2012
Posts: 78
Location: CYOO
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 Posted: Fri Jul 26, 2013 8:36 am Post subject: CO in the cockpit of a Zodiac 601XL-B |
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Need some help guys. I'm getting VERY high CO readings in the cockpit. Especially in slow flight. Rotax 912ULS powered. I get CO entering even at 110kts. Any ideas? I plugged off my cabin heat and It made no difference. Exhaust re-sealed at the joints. Noticed the CO increased when I re-sealed the two stacks out of the main muffler. I'm lost.....
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SIDESLIP
Joined: 14 Oct 2012
Posts: 78
Location: CYOO
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| Posted: Fri Jul 26, 2013 8:40 am Post subject: Re: CO in the cockpit of a Zodiac 601XL-B |
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Here is the stacks.
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mhubel
Joined: 05 Sep 2009
Posts: 141
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| Posted: Fri Jul 26, 2013 10:37 am Post subject: CO in the cockpit of a Zodiac 601XL-B |
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Actually, I had a Jabiru 3300 and had the same problem. Even with
everything well sealed in the engine area, it was a problem. I found all
the CO was coming back through the tail. Putting a CO monitor in back of
the seats produced off the scale numbers.
I was going to seal all the gaps around the tail, there is a big
opening around the elevator where I believe most of it comes in through.
I have switched engines to a Honda/Viking and the problem has gone away.
I expect it is 90% because the Honda burns so much cleaner that the CO
blown by the tail is almost non existent compared to a Jabiru.
Before this is taken as an endorsement of the Honda/Viking, note
that I had to do a lot of modification to that installation.
On 07/26/2013 12:36 PM, SIDESLIP wrote:
--
Mark Hubelbank
NorthEast Monitoring
2 Clock Tower Place
Suite 555
Maynard, MA, 01754 - USA
mhubel(at)nemon.com
978-443-3955
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Mark Hubelbank
N708HU
CH601XL
Jabiru 3300
Rotec TBI 40-3 carb
Sensenich ground adj prop.
240 hr TAF
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paulrod36(at)msn.com
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| Posted: Fri Jul 26, 2013 12:49 pm Post subject: CO in the cockpit of a Zodiac 601XL-B |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> You might consider adding a pair of pipe extensions (I assume you have two exhaust pipes) set to release the exhaust somewhat lower, and more aft, just to see if it helps. Otherwise, your choices would be limited to finding and sealing all possible leaks, or wind-pressurizing the cockpit and blowing everything aft. Either way, until you solve it, keep your flights short. CO2 sneaks up on you.
Paul R
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SIDESLIP
Joined: 14 Oct 2012
Posts: 78
Location: CYOO
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| Posted: Fri Jul 26, 2013 1:21 pm Post subject: Re: CO in the cockpit of a Zodiac 601XL-B |
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Here is where the pipes sit. You think they need to be further back and down?
Chad
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PatrickW
Joined: 27 Oct 2006
Posts: 380
Location: Fort Worth, Texas
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| Posted: Wed Jul 31, 2013 3:04 am Post subject: Re: CO in the cockpit of a Zodiac 601XL-B |
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I had CO when I tore some weatherstripping out from under the canopy rails.
Replacing that cured it.
Pat Hoyt
N63PZ
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SIDESLIP
Joined: 14 Oct 2012
Posts: 78
Location: CYOO
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| Posted: Wed Jul 31, 2013 3:33 am Post subject: Re: CO in the cockpit of a Zodiac 601XL-B |
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Just put new weather stripping in. Departing on a flight now. Report back....
Chad
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SIDESLIP
Joined: 14 Oct 2012
Posts: 78
Location: CYOO
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| Posted: Wed Jul 31, 2013 3:57 pm Post subject: Re: CO in the cockpit of a Zodiac 601XL-B |
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Flight report....
So I also installed a Snap Vent (3.25") right above the latch mechanism. Gobs of air fill the cockpit. I still seem to smell engine exhaust, but the CO card stayed orange, not even hesitating to change color. That confuses me. With all the vents closed, the usual vacuum suction at the canopy base is gone. I think because the canopy causes the cockpit to be low pressure, it tries to suck air into the plane to try to equalize the cabin pressure. Even with the vents closed, the CO never got into changing color. Yet I could still smell exhaust. Either way, with this new vent, it vacates the cockpit air within seconds, so even if I had high CO, I could just flush with the snap vent and start over. I'm ok with it now since it didn't register any CO. I doubled the firewall sealing that was there previously. Hoping that next I can figure out a bellow for the nose wheel rods. CO DEFINITELY comes in there. Other then that, the only issue I had today was that my fancy Chinese made hole saw left the hole 1/16" too large, so the snap vent flops around in the hole. Now to figure out that "issue" next. Great plane though! Just awesome! I flew with a 701 with an 80hp Rotax a few weeks back, and it does 70mph cruise. Slowed the Zodiac down to that speed (at) 3500rpm and wow, that's really slow. Such a HUGE speed difference once you feel it in person. I was shocked. Random thought off track..... Sorry. Lol.
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