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Air intake tube vanes and EGT's

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Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Fri Jul 17, 2009 7:50 am Post subject: Air intake tube vanes and EGT's

Fifteen months after I first built vanes into my fiberglass air  

intake tube, I finally tried something different, and got success.  

When I first installed the vanes into my existing homebuilt  

fiberglass 90-degree intake tube, I didn't notice any improvement. I  

had been fighting a high #4 cylinder EGT (1405-1425 degrees F) for  

quite a while, and it seemed that no amount of rotating the carb  

would change that. I had tried swapping the EGT probes but that  

didn't prove anything. So today I decided to try rotating the tube so  

that the vanes were at a different position relative to the carb.  

This finally made the difference. Before, #4 was always the hottest  

at 110 to 126 degrees hotter than #3 at 2940- 2960 rpm. Then I  

decided to try...again...to rotate the carb bottom towards the hot  

(left) side. I had done this in the past, but it never seemed to help  

enough. Then a few days ago, I rotated it as much as the throttle  

mount bracket would allow before it hit the motor mount. This got the  

difference down to 45-63 degrees, with #4 still being the hottest.  

But today I rotated the vaned intake tube, and man, what a  

difference! Now, #3 is the hottest at 19-55 degrees hotter than #4.  

The highest I now see #4 is 1318, and the highest I see #3 is 1356.  

These numbers were taken at various throttle settings, around 3400'  

MSL, and on 56-60 degrees OAT at altitude.

I don't know why I didn't try the tube rotation as relative to the  

carb before. Right after I installed the vanes into the tube, I guess  

I just thought that if it didn't change things dramatically the very  

first time I attached it, nothing was changed by installing the  

vanes. It just goes to show that you shouldn't give up without at  

least trying something a little  different. Now I will try rotating  

the carb back a little bit, and see if I can get the #3 and #4 closer  

together. The exhaust gas temp spread is now

between 85 -132 depending on throttle position.



Lynn Matteson

Kitfox IV Speedster, taildragger

Jabiru 2200, #2062, 705.6 hrs

Sensenich 62"x46" Wood prop

Electroair direct-fire ignition system

Status: flying

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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

wb2ssj(at)frontiernet.net
Guest

Posted: Fri Jul 17, 2009 5:06 pm Post subject: Air intake tube vanes and EGT's

Lynn, are you talking about vanes you installed in the air duct from the 

airfilter to the carb, and if so do you have a picture?

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Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Fri Jul 17, 2009 6:21 pm Post subject: Air intake tube vanes and EGT's

Sure do, Tex....here it is. I also have pictures of building the  

vanes. The gist of it is, I cut the tube down the vertical middle,  

then using two separate sheets of fiberglass, I built the vanes  

inside the tube, then fiberglassed the tube halves back together.



Lynn Matteson

Kitfox IV Speedster, taildragger

Jabiru 2200, #2062, 706.2 hrs

Sensenich 62"x46" Wood prop

Electroair direct-fire ignition system

Status: flying





On Jul 17, 2009, at 9:00 PM, Tex Mantell wrote:



 	  Quote: 	
		   

 <wb2ssj(at)frontiernet.net>



 Lynn, are you talking about vanes you installed in the air duct  

 from the airfilter to the carb, and if so do you have a picture?

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

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