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Any Arctic Sparrow users out there?

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corbob13

Joined: 02 Apr 2008
Posts: 18
Location: Pulaski, WI

Posted: Mon Dec 01, 2008 10:41 am Post subject: Any Arctic Sparrow users out there?

Is anyone really familiar with the Arctic Sparrow mixture control that can provide some guidance?  Before I tear apart the carbs on my 582 I want to know what I'm up against.  



My problem is that it seems the needles on my carburetors are not ideal.   As I run through the rpm range on the aircraft I'm constantly turning the knobs to get my mixture control right.  At cruise (~5000 RPM) I can have the mixture set so my EGTs are right around 1100-1150 degrees, but if I adjust the throttle at all, in either direction, the EGTs start falling.  Additionally I'd like the ability to run a bit leaner at a lower RPM, while taxiing for instance since the mixture is way to rich and the engine runs very rough.  Can the mixture needle be changed when the Arctic Sparrow is used?  would I be better off changing the main jet and sanding the needle down a bit in the area where it's most lean?



Any advice would be greatly appreciated. 



Thanks

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Cory

N903DB
Kitfox Model II, Rotax 582

Tom Jones

Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA

Posted: Tue Dec 02, 2008 6:01 am Post subject: Re: Any Arctic Sparrow users out there?

Here are a couple articles that explain the Arctic Sparrow needle adjustments very well.  I use mine to adjust the needle richer in winter and leaner in summer.  I can tell when its time to do so by an increase in EGTs (too lean) or a miss in the engine (too rich) below 5800 rpm.



The sparrow needle adjustment affects the mid range circuit.  You should be able to lean out your idle circuit by turning the idle air screws on the carbs counter clockwise.



You cannot just change the needles as they have been modified and the system and parts seem to have disappeared from the sources.  Does anyone know a current source?



http://www.ultralightnews.com/enginetroublshooting/arcticsparrow.htm



http://www.ultralightnews.com/enginetroublshooting/arcticsparrow2.htm



After you read these articles you should have your answer.  Notice in the second article where it states full power should be "500 to 750 cooler"...obviously a misprint...should say 50 degrees to 75 degrees cooler.

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Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA

corbob13

Joined: 02 Apr 2008
Posts: 18
Location: Pulaski, WI

Posted: Wed Dec 03, 2008 10:56 am Post subject: Re: Any Arctic Sparrow users out there?

Tom,

Good links, thanks for the help.

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_________________
Cory

N903DB
Kitfox Model II, Rotax 582

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