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Bing 94 carb question

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Thom Riddle

Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

Posted: Thu Nov 12, 2009 7:05 am Post subject: Bing 94 carb question

I recently dissasembled, inspected and cleaned the Bing 94 carb on my Jabiru 2200A #1574. All is well after 240 hours. 



Yesterday, I did the same for a customer's carb from Jabiru 2200A #2058. It is in great shape but I found one anomaly (or so it seems to me) and would like to find out if any of your Bing 94 carbs have this same thing. In the brass tube that receives fuel from  starting chamber in the float bowl (not the main jet area but the small diameter chamber at one corner) there is a tiny hole in the side of this brass tube about 3/16" below the top of the fuel bowl, and thus above the normal fuel level in the bowl. If this hole is not supposed to be there it could be contributing to the cold start problem he is having by allowing excess air to be drawn in and less than full rich fuel charge during engine start.



My question is this: Have any of you seen this tiny hole in the side of the brass tube that picks up fuel in the start chamber? My Bing 94 does not have this nor does any Bing 64 carb on which i've worked (lots of them).



I spolke to Pete yesterday about this and he said he has never noticed this but would be looking at one of his carbs to see. I'd like to hear from any other Jabiru operators with Bing 94 carbs to see if this tiny hole is a manufacturing anomaly or "as designed" in the later engines.



I've attached a photo of the carb with the hole I'm asking about.



http://riddletr.googlepages.com/a%26pmechanix

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Bing 94 starting tube hole.jpg

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_________________
Thom Riddle
Buffalo, NY (9G0)

Don't worry about old age... it doesn't last very long.
- Anonymous

jd(at)lawsonimaging.ca
Guest

Posted: Thu Nov 12, 2009 7:49 am Post subject: Bing 94 carb question

Thom Riddle wrote:

 	  Quote: 	
		   

 

 

 My question is this: Have any of you seen this tiny hole in the side of the

 brass tube that picks up fuel in the start chamber? My Bing 94 does not have

 this nor does any Bing 64 carb on which i've worked (lots of them).


	


Just checked the Bing (guess its a 94...) that came with my 3300a s.n. 1053

It does indeed have the hole as per your pic. Bing is unused/unneeded.



-- 

Regards,  J.



Sonex #325 C-FJNJ, Jabiru 3300a, Prince P-Tip, Aerocarb

restoring the Johnston Special

http://cleco.ca



+-------------------------------------------------------------+

|  J. Davis, M.Sc.            | (computer science)            |

| *NIX consulting, SysAdmin   | email: jd at lawsonimaging.ca |

+-------------------------------------------------------------+



and now... Deep Thought #24, by Jack Handy



I don't think I'm alone when I say I'd like to see more and more planets fall

under the ruthless domination of our solar system.

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Thom Riddle

Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

Posted: Thu Nov 12, 2009 8:15 am Post subject: Re: Bing 94 carb question

J.



Thanks for your quick reply. It is unlikely that this hole is in more than one carb if it is not intentional, so it is beginning to appear to me that this is a design change implemented sometime after mine was built.

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Thom Riddle
Buffalo, NY (9G0)

Don't worry about old age... it doesn't last very long.
- Anonymous

zeprep251(at)aol.com
Guest

Posted: Thu Nov 12, 2009 12:05 pm Post subject: Bing 94 carb question

Thom,

 Looks like the bottom of the tube has had a taper machined on it,like you would do to assist pressing it into the carb body.

 

   G.Aman

 

   

 

 --

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Thom Riddle

Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

Posted: Thu Nov 12, 2009 12:16 pm Post subject: Re: Bing 94 carb question

Yes, Gary. I noticed that too. My guess is they make both ends tapered so that it does not matter which end is pickup by the robot that presses the other end into the base of the carb. Nothing is made by hand anymore.... other than our airplanes .

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Thom Riddle
Buffalo, NY (9G0)

Don't worry about old age... it doesn't last very long.
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zeprep251(at)aol.com
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Posted: Thu Nov 12, 2009 1:20 pm Post subject: Bing 94 carb question

Just thought the hole would be below the float level if it were reversed.

 

   

 

   

 

 --

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Thom Riddle

Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

Posted: Thu Nov 12, 2009 1:33 pm Post subject: Re: Bing 94 carb question

Now that I know that this one carb is not the only one with this hole, I must assume that it is there by design and performs some desirable function. Since it is above the fuel level its purpose must be to allow some air to be drawn in along with the fuel in the starting chamber, in effect either leaning it somewhat or perhaps it helps to aerate or atomize it a bit. Only the Bing engineers will know the real reason it is there. My thoughts are pure speculation.

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Lynn Matteson

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

Posted: Thu Nov 12, 2009 1:43 pm Post subject: Bing 94 carb question

The Bing that was once on my engine (#2062) also has this hole, for  

what it's worth.



Lynn Matteson

Kitfox IV Speedster, taildragger

Jabiru 2200, #2062, 814.7 hrs

Countdown to 1000 hrs~185 to go

Sensenich 62"x46" Wood prop

Electroair direct-fire ignition system

Rotec TBI-40 injection

Status: flying (and learning)

do not archive



On Nov 12, 2009, at 4:33 PM, Thom Riddle wrote:



 	  Quote: 	
		   

 <riddletr(at)gmail.com>



 Now that I know that this one carb is not the only one with this  

 hole, I must assume that it is there by design and performs some  

 desirable function. Since it is above the fuel level its purpose  

 must be to allow some air to be drawn in along with the fuel in the  

 starting chamber, in effect either leaning it somewhat or perhaps  

 it helps to aerate or atomize it a bit. Only the Bing engineers  

 will know the real reason it is there. My thoughts are pure  

 speculation.



 --------

 Thom Riddle

 Buffalo, NY

 Kolb Slingshot SS-021

 Jabiru 2200A #1574

 Tennessee Prop 64x31



 &quot;Rules are for the guidance of wise men and the obedience of  

 fools.&quot;

  - Pablo Mason





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p 72495#272495

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Lynn
Kitfox IV-Jabiru 2200
N369LM

debandpete(at)bigpond.com
Guest

Posted: Thu Nov 12, 2009 6:25 pm Post subject: Bing 94 carb question

I have seen these holes above fuel level on many carbs and yes, it is to aerate the fuel to assist in vaporisation.

 

 Cheers,

 Peter

 

 On 13/11/09 08:33, Thom Riddle wrote: [quote]    	  Quote: 	
		  --> JabiruEngine-List message posted by: "Thom Riddle" <riddletr(at)gmail.com> (riddletr(at)gmail.com)



Now that I know that this one carb is not the only one with this hole, I must assume that it is there by design and performs some desirable function. Since it is above the fuel level its purpose must be to allow some air to be drawn in along with the fuel in the starting chamber, in effect either leaning it somewhat or perhaps it helps to aerate or atomize it a bit. Only the Bing engineers will know the real reason it is there. My thoughts are pure speculation.



--------

Thom Riddle

Buffalo, NY

Kolb Slingshot SS-021

Jabiru 2200A #1574

Tennessee Prop 64x31



&quot;Rules are for the guidance of wise men and the obedience of fools.&quot;

 - Pablo Mason





Read this topic online here:



[url=http://forums.matronics.com/viewtopic.php?p 72495#272495]http://forums.matronics.com/viewtopic.php?p 72495#272495[/url]





  	
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