---------------------------------------------------------- KIS-List Digest Archive --- Total Messages Posted Sun 11/06/16: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:46 AM - Long running #3 hot cylinder problem (Galin Hernandez) 2. 09:15 AM - #3 Cylinder problem - resent (Galin Hernandez) 3. 05:47 PM - Hot #3 Cylinder - Msg sent again (Galin Hernandez) 4. 06:28 PM - Problems posting messages (Galin Hernandez) ________________________________ Message 1 _____________________________________ Time: 08:46:18 AM PST US From: Galin Hernandez Subject: KIS-List: Long running #3 hot cylinder problem I have been fighting an *intermittent* hot #3 cylinder on my Lycoming O360 for years and nothing seemed to work. When the problem shows up I have to run the engine quite rich to bring the #3 CHT to just under 400F but at the same time the the other cylinders were at least 50 degrees cooler. Worst still on many flight the CHT's were fine and all 4 cylinders were very close to each other. I tried changing the CHT probe with no luck and my baffling was perfect, or so I thought. Pardon the pun, but this was baffling. After reading a completely un unrelated thread on VANS AF on inexpensive borescopes, I bought a Vividia VA-400 Borescope. Out of curiosity a few days ago I used the borescope and looked into the firewall *with the cowl on*. I found that, when installed, the top cowl was folding part of the baffling down and almost completely blocking air to, you guessed it, the #3 cylinder head. You can clearly see it in the picture: https://drive.google.com/file/d/0B-q...ew?usp=sharing With the cowl top off, the baffles are perfectly aligned with no blockage whatsoever so everything looks good. With the cowl top on, you can't see the baffling near cylinder #3 since cylinder #1 blocks the view. I could not have found this problem without a borescope. I immediately fixed it so it can never happen again. After completing two separate 2hr flights (back and forth from Ft. Benning, GA), everything went perfect. The #3 CHT stayed within 5 degrees of the other 3 CHT's for the entire flight. My "hottest" cylinder is now #2 but only a few degrees hotter than #3. All 4 cylinders are within 10 degrees of each other. Not bad for a carbureted engine. Since I have now flown more than 4hrs with this configuration with very similar results, I am optimistic that I finally fixed the problem. So if you are experiencing one cylinder getting much hotter than the others and no matter what you do nothing seems to fix it, *check your baffles with the cowl ON*. Make sure that, when installed, your cowl isn't bending a baffle preventing air from cooling a particular cylinder. In my case, and probably most others, you can't check the rear cylinder baffling area without a borescope. ________________________________ Message 2 _____________________________________ Time: 09:15:17 AM PST US From: Galin Hernandez Subject: KIS-List: #3 Cylinder problem - resent For some reason this e-mail went through all garbled. Let me try again. I have been fighting an *intermittent* hot #3 cylinder on my Lycoming O360 for years and nothing seemed to work. When the problem shows up I have to run the engine quite rich to bring the #3 CHT to just under 400F but at the same time the the other cylinders were at least 50 degrees cooler. Worst still on many flight the CHT's were fine and all 4 cylinders were very close to each other. I tried changing the CHT probe with no luck and my baffling was perfect, or so I thought. Pardon the pun, but this was baffling. After reading a completely un unrelated thread on VANS AF on inexpensive borescopes, I bought a Vividia VA-400 Borescope. Out of curiosity a few days ago I used the borescope and looked into the firewall *with the cowl on*. I found that, when installed, the top cowl was folding part of the baffling down and almost completely blocking air to, you guessed it, the #3 cylinder head. You can clearly see it in the picture: https://drive.google.com/file/d/0B-q...ew?usp=sharing With the cowl top off, the baffles are perfectly aligned with no blockage whatsoever so everything looks good. With the cowl top on, you can't see the baffling near cylinder #3 since cylinder #1 blocks the view. I could not have found this problem without a borescope. I immediately fixed it so it can never happen again. After completing two separate 2hr flights (back and forth from Ft. Benning, GA), everything went perfect. The #3 CHT stayed within 5 degrees of the other 3 CHT's for the entire flight. My "hottest" cylinder is now #2 but only a few degrees hotter than #3. All 4 cylinders are within 10 degrees of each other. Not bad for a carbureted engine. Since I have now flown more than 4hrs with this configuration with very similar results, I am optimistic that I finally fixed the problem. So if you are experiencing one cylinder getting much hotter than the others and no matter what you do nothing seems to fix it, *check your baffles with the cowl ON*. Make sure that, when installed, your cowl isn't bending a baffle preventing air from cooling a particular cylinder. In my case, and probably most others, you can't check the rear cylinder baffling area without a borescope. ________________________________ Message 3 _____________________________________ Time: 05:47:59 PM PST US From: Galin Hernandez Subject: KIS-List: Hot #3 Cylinder - Msg sent again Hope this message goes through this time. I have been fighting an *intermittent* hot #3 cylinder on my Lycoming O360 for years and nothing seemed to work. When the problem shows up I have to run the engine quite rich to bring the #3 CHT to just under 400F but at the same time the the other cylinders were at least 50 degrees cooler. Worst still, on many flight the CHT's were fine and all 4 cylinders were very close to each other. I tried changing the CHT probe with no luck and my baffling was perfect, or so I thought. Pardon the pun, but it was baffling. After reading a completely un unrelated thread on VANs Air Force Forum about inexpensive borescopes, I bought a Vividia VA-400 Borescope. Last week, and out of curiosity, I used the borescope and looked into the firewall *with the cowl still on*. I found that, when installed, the top cowl was folding part of the baffling down and almost completely blocking air to, you guessed it, the #3 cylinder head. You can clearly see it in the picture: https://drive.google.com/file/d/0B-qYL3LiViE3cWNCa3AyVWhCelk/view?usp=sharing With the cowl top off, the baffles align perfectly with no blockage whatsoever so everything looks good. With the cowl top on, you can't see the baffling near cylinder #3 since cylinder #1 blocks the view. I could not have found this problem without a borescope. Over the past few days I did two 2hr flights (St Augustine to Ft. Benning and back) and everything went perfect. The #3 CHT stayed within 5 degrees of the other 3 CHT's for the entire flight. My "hottest" cylinder was #2 but only a few degrees hotter than #3. All 4 cylinders are within 10 degrees of each other. Not bad for a carbureted engine. Since I have flown more than 4hrs with very similar results, I am optimistic that I finally fixed the problem. So if you are experiencing one cylinder getting much hotter than the others and no matter what you do nothing seems to fix it, *check your baffles with the cowl ON*. Make sure that, when installed, your cowl isn't bending a baffle preventing air from cooling a particular cylinder. In my case, and probably most others, you can't check the rear cylinder baffling area without a borescope. ________________________________ Message 4 _____________________________________ Time: 06:28:59 PM PST US From: Galin Hernandez Subject: KIS-List: Problems posting messages I have tried to post 3 messages with no luck. Is anybody else having this problem? ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message kis-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/KIS-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/kis-list Browse Digests http://www.matronics.com/digest/kis-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.