EGT Woes
in 912 / 914 Technical Questions
10 years ago
I have several questions/issues that I need help with, but will post one at a time.
I have owned my Rotax 912S powered Titan Tornado II for about 3 years. I have been dismayed about Exhaust gas temperatures being different between the right and left side, and had tried several things to remedy the problem. At cruise settings above 5200 RPM the difference would typically be about 60 Deg. F. But below that RPM and down to 4000 RPM I could see as much as 100 Deg. F. difference.
One day this last winter I changed the configuration of my carb vent hoses and miraculously at climb out power the EGT between the two sides was identical. Below 5200 RPM I wouldn't see much more then 30 Deg. Difference.
To test it to make sure it wasn't some fluke, I returned the vent tubes to their original positions under the carb bowl clips, and the old EGT temps duplicated themselves. I returned the vent hoses to their new positions (left pointing straight down and attached to the fuel line entering the carb; the right side also pointing straight down and attached to a convenient hose--lengths of the vent hoses are 5 inches). The sweet EGT temps returned.
I have been flying for approx. two months and have been elated to see the right and left side EGT temps so close, and thought I had my problem licked until this weekend. With the vent hoses in the new positions my EGT variation woes have returned.
Anybody have any idea what might be causing the EGT differences? Temperatures have been rising due to the season change, could this have anything to do with the problem?
Following the Titan Tornado Group on Yahoo I noted that a year or so ago some suggested venting the vent tubes into the air cleaners. Has anybody done this? Can you give me any details like how far from the carb inlet, how far into the air filter, etc.??
Thank you.
I have owned my Rotax 912S powered Titan Tornado II for about 3 years. I have been dismayed about Exhaust gas temperatures being different between the right and left side, and had tried several things to remedy the problem. At cruise settings above 5200 RPM the difference would typically be about 60 Deg. F. But below that RPM and down to 4000 RPM I could see as much as 100 Deg. F. difference.
One day this last winter I changed the configuration of my carb vent hoses and miraculously at climb out power the EGT between the two sides was identical. Below 5200 RPM I wouldn't see much more then 30 Deg. Difference.
To test it to make sure it wasn't some fluke, I returned the vent tubes to their original positions under the carb bowl clips, and the old EGT temps duplicated themselves. I returned the vent hoses to their new positions (left pointing straight down and attached to the fuel line entering the carb; the right side also pointing straight down and attached to a convenient hose--lengths of the vent hoses are 5 inches). The sweet EGT temps returned.
I have been flying for approx. two months and have been elated to see the right and left side EGT temps so close, and thought I had my problem licked until this weekend. With the vent hoses in the new positions my EGT variation woes have returned.
Anybody have any idea what might be causing the EGT differences? Temperatures have been rising due to the season change, could this have anything to do with the problem?
Following the Titan Tornado Group on Yahoo I noted that a year or so ago some suggested venting the vent tubes into the air cleaners. Has anybody done this? Can you give me any details like how far from the carb inlet, how far into the air filter, etc.??
Thank you.
