Today's Message Index:
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1. 04:02 AM - Re: Zenith601-List Digest: 1 Msgs - 07/27/13 (Airvair601)
2. 02:43 PM - CO (BobbyPaulk@comcast.net)
Message 1
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| Subject: | Re: Zenith601-List Digest: 1 Msgs - 07/27/13 |
Wonder if this is an issue? Easy to check. Need to do it early on! With our funky
exhaust it might be a challenge
Sent from my iPad
On Jul 28, 2013, at 3:00 AM, Zenith601-List Digest Server <zenith601-list@matronics.com>
wrote:
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> Total Messages Posted Sat 07/27/13: 1
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> Today's Message Index:
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> 1. 06:02 AM - CO (BobbyPaulk@comcast.net)
>
>
>
> ________________________________ Message 1 _____________________________________
>
>
> Time: 06:02:24 AM PST US
> From: BobbyPaulk@comcast.net
> Subject: Zenith601-List: CO
>
>
> Guys,
> I had posted some time back about CO in the cockpit of my 601XL ( Jabiru ). I
had
> circled a friends hangar 3 times at another airport at 80 MPH. ( high angle
> of attack ) When I straightened up to fly home I was nauseous and smelled exhaust
> fumes very strongly. The CO monitor pill was solid black. I opened both cabin
> air vents even though it was about 40 deg. outside. I had a very bad headache
> for the next 4 ~ 5 Hrs.
> I extended my exhaust pipe another 5 or 6 inches with a 45 deg. turn down and
it
> seemed to help. I thought I had sealed the firewall completely but one day when
> I had a light in the engine compartment and the hangar was dark I looked in
> the cockpit & found two small leaks in the firewall right behind the lower engine
> mounts. This was on the quick build kit.
> While my engine was running very rich I noticed the black stains on the belly
just
> behind the firewall were running forward back toward the low pressure area
> at the firewall. I have tried adding a skirt to the lower cowl with no improvement.
>
> I also saw the black stains around the belly access panel. Summer seems to be
O.K.
> due to the air vents being open and pressurizing the cockpit somewhat, winter
> when the vents are closed is when I experience the worst smells. The cockpit
> on the XL has a strong negative pressure - you can check this by getting your
> shirt sleeve or shop rag close to the canopy rail where it is not sealed.
> The exhaust extension, re-sealing the firewall, and the engine finally running
> correctly have all helped but I still get a whiff of CO particularly at a high
> angle of attack or slow speed.
> I am still trying to find a way to seal the 6 built in leaks in the Jabiru exhaust
> connections.
> Any ideas?? Wraps usually burn away in 4 or 5 hours.
>
> Bobby ( age 75 )
> Zodiac 601 XL "B"
> Jabiru 3300 S/N 1141
> Sensenich 64" x 51" Prop
> Bing Carb 260 Main & 285 Needle Jet
> Status - Flying 185 hrs.
>
> Do Not Archive
>
>
>
>
>
>
>
>
Message 2
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I should have said the cockpit has positive pressure instead of neg.
It has less positive pressure with the outside air vents closed.
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