---------------------------------------------------------- Zenith601-List Digest Archive --- Total Messages Posted Fri 07/26/13: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 09:37 AM - CO in the cockpit of a Zodiac 601XL-B (SIDESLIP) 2. 09:40 AM - Re: CO in the cockpit of a Zodiac 601XL-B (SIDESLIP) 3. 11:37 AM - Re: CO in the cockpit of a Zodiac 601XL-B (Mark Hubelbank) 4. 01:49 PM - Re: CO in the cockpit of a Zodiac 601XL-B () 5. 02:22 PM - Re: CO in the cockpit of a Zodiac 601XL-B (SIDESLIP) ________________________________ Message 1 _____________________________________ Time: 09:37:22 AM PST US Subject: Zenith601-List: CO in the cockpit of a Zodiac 601XL-B From: "SIDESLIP" 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..... -------- C-GYXQ. 912ULS. 601XL-B Read this topic online here: http://forums.matronics.com/viewtopic.php?p=405351#405351 Attachments: http://forums.matronics.com//files/image_166.jpg http://forums.matronics.com//files/image_131.jpg ________________________________ Message 2 _____________________________________ Time: 09:40:16 AM PST US Subject: Zenith601-List: Re: CO in the cockpit of a Zodiac 601XL-B From: "SIDESLIP" Here is the stacks. -------- C-GYXQ. 912ULS. 601XL-B Read this topic online here: http://forums.matronics.com/viewtopic.php?p=405352#405352 Attachments: http://forums.matronics.com//files/image_301.jpg ________________________________ Message 3 _____________________________________ Time: 11:37:30 AM PST US From: Mark Hubelbank Subject: Re: Zenith601-List: CO in the cockpit of a Zodiac 601XL-B 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: > > 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..... > > -------- > C-GYXQ. 912ULS. 601XL-B > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=405351#405351 > > > Attachments: > > http://forums.matronics.com//files/image_166.jpg > http://forums.matronics.com//files/image_131.jpg > > -- Mark Hubelbank NorthEast Monitoring 2 Clock Tower Place Suite 555 Maynard, MA, 01754 - USA mhubel@nemon.com 978-443-3955 ________________________________ Message 4 _____________________________________ Time: 01:49:10 PM PST US From: Subject: Re: Zenith601-List: CO in the cockpit of a Zodiac 601XL-B 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 ----- Original Message ----- From: Mark Hubelbank To: zenith601-list@matronics.com Sent: Friday, July 26, 2013 1:37 PM Subject: Re: Zenith601-List: CO in the cockpit of a Zodiac 601XL-B > 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: > > > 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..... > > -------- > C-GYXQ. 912ULS. 601XL-B > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=405351#405351 > > > > > Attachments: > > http://forums.matronics.com//files/image_166.jpg > http://forums.matronics.com//files/image_131.jpg > > > > > > > > > -- Mark Hubelbank NorthEast Monitoring 2 Clock Tower Place Suite 555 Maynard, MA, 01754 - USA mhubel@nemon.com 978-443-3955 http://www.matronics.com/Navigator?Zenith601-List http://www.matronics.com/contribution ________________________________ Message 5 _____________________________________ Time: 02:22:36 PM PST US Subject: Zenith601-List: Re: CO in the cockpit of a Zodiac 601XL-B From: "SIDESLIP" Here is where the pipes sit. You think they need to be further back and down? Chad -------- C-GYXQ. 912ULS. 601XL-B Read this topic online here: http://forums.matronics.com/viewtopic.php?p=405368#405368 Attachments: http://forums.matronics.com//files/image_211.jpg ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message zenith601-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Zenith601-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/zenith601-list Browse Digests http://www.matronics.com/digest/zenith601-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.