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Jabiru

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BobbyPaulk(at)comcast.net
Guest

Posted: Tue Mar 15, 2011 3:27 pm Post subject: Jabiru

Martin,

I checked the carb when I received it and found it came with a 250 in lieu of a 255 main jet. It would not turn up for the previous owner and I believe it was due to being too lean. I went up in size slowly watching EGT and CHT's.  I ordered a 260 main jet from Pete and installed it. I also ordered a 290 needle jet and bored it to 295.

I have changed jets so many times I don't even pull the carb off the engine any more. i think it is about as close to being right as I can get it.



bobby

116 hrs.



 [quote][b]

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aerobiz1(at)gmail.com
Guest

Posted: Tue Mar 15, 2011 4:15 pm Post subject: Jabiru

Hi Bobby,



There are a few more mods that can be made, but not necessary maybe in your application.

These include drilling out the idle air bleed (which may entail upping the idle jet to #45) drilling out the main airbleed and the emulsion tube holes and even the jet in the float bowl that feeds the 'choke' circuit.  Also placing a small washer under the clip on the needle will richen the mixture in cruise.

 



But I really think that the problems are poor mixture distribution due to the manifold design, sometimes helped by angling the carb.

Martin



On Wed, Mar 16, 2011 at 9:24 AM,  <BobbyPaulk(at)comcast.net (BobbyPaulk(at)comcast.net)> wrote:

 [quote]Martin,

I checked the carb when I received it and found it came with a 250 in lieu of a 255 main jet. It would not turn up for the previous owner and I believe it was due to being too lean. I went up in size slowly watching EGT and CHT's.  I ordered a 260 main jet from Pete and installed it. I also ordered a 290 needle jet and bored it to 295.

 I have changed jets so many times I don't even pull the carb off the engine any more. i think it is about as close to being right as I can get it.



bobby

116 hrs.



  	  Quote: 	
		  



ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List

tp://forums.matronics.com

_blank">http://www.matronics.com/contribution



	


[b]

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plus2s

Joined: 30 Nov 2006
Posts: 65
Location: NEW ZEALAND

Posted: Tue Mar 15, 2011 6:36 pm Post subject: Jabiru

Have you checked the Needle & seat in the carb ?

The early engines used the same as the 4 cyl but has since been upgraded to a larger size to allow more fuel flow.



Regards

Keith



--- On Wed, 16/3/11, Martin Hone <aerobiz1(at)gmail.com> wrote:



 	  Quote: 	
		   From: Martin Hone <aerobiz1(at)gmail.com>

 Subject: Re: Jabiru

 To: jabiruengine-list(at)matronics.com

 Date: Wednesday, 16, March, 2011, 1:11 PM

 Hi Bobby,

 There are a few more mods that can be made, but

 not necessary maybe in your application.These

 include drilling out the idle air bleed (which may entail

 upping the idle jet to #45) drilling out the main airbleed

 and the emulsion tube holes and even the jet in the float

 bowl that feeds the 'choke' circuit.  Also placing

 a small washer under the clip on the needle will richen the

 mixture in cruise.

 

 But I really think that the problems are poor

 mixture distribution due to the manifold design, sometimes

 helped by angling the carb.

 Martin

 

 On Wed, Mar 16, 2011

 at 9:24 AM,  <BobbyPaulk(at)comcast.net>

 wrote:

 

 Martin,

 I checked the carb when I received it and found it came

 with a 250 in lieu of a 255 main jet. It would not turn up

 for the previous owner and I believe it was due to being too

 lean. I went up in size slowly watching EGT and CHT's. 

 I ordered a 260 main jet from Pete and installed it. I also

 ordered a 290 needle jet and bored it to 295.

 

 I have changed jets so many times I don't even pull the

 carb off the engine any more. i think it is about as close

 to being right as I can get it.

 

 bobby

 116 hrs.

 

 

 

 ist"

 target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List

 tp://forums.matronics.com

 _blank">http://www.matronics.com/contribution

- The Matronics JabiruEngine-List Email Forum -

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:

http://www.matronics.com/Navigator?JabiruEngine-List

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