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BobbyPaulk(at)COMCAST.NET
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 Posted: Tue Nov 04, 2008 12:12 pm Post subject: Carburetor |
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List,
my 3300 Jab idles fairly good at 800 ~ 900 Rpm when i crack the throttle off idle at about 1050 to 1300 it will puff black smoke. at 1500 rpm it will smooth out.
has any one changed jets or needle to fix the idle and low end mixture.
i think if i change the needle jet to a smaller size then it would run too lean at cruise.
this would call for a change in needle configuration.
i gotta do something. any help would be appreciated.
bobby
N131BP
601 XL
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azevedoflyer(at)gmail.com
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| Posted: Tue Nov 04, 2008 3:16 pm Post subject: Carburetor |
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Bob,
From an user of SU carbs in English cars:
The symptoms are of a rich mixture which comes about when you open the butterfly (mixture mass flow control) but the slider (air valve control) is stuck closed.
The BING carb must have - just like SUs - some sort of damping system to preclude the slider to jerk open as you open the throttle. SUs do it via a small reservoir filled with very light oil and a plunger. Oil can leak through the plunger at a prescribed rate, and this controls how fast the slider opens. I do not know how this is accomplished by BING but it is worth some study.
If the slider is sticking, as you open the throttle fuel is sucked from the needle well but the slider does not allow more air flow and this results in an overly rich mixture and black smoke.
Check the slider for smooth motion from fully closed to fully open. If some stickiness is noted, a cleaning is in order. These carbs are very, very sensitive to dirt, dust or other miniscule things that may get in between the slider and guide. Worst case scenario is a punctured rubber membrane (diaphragm) which pulls the slider up. A tiny leakage will induce the described behavior also. It will not matter greatly above a certain speed.
Do not change needles unecessarily.
Good hunting!
Miguel Azevedo
PA22/20-150
On Tue, Nov 4, 2008 at 3:10 PM, <BobbyPaulk(at)comcast.net (BobbyPaulk(at)comcast.net)> wrote:
[quote]--> JabiruEngine-List message posted by: BobbyPaulk(at)comcast.net (BobbyPaulk(at)comcast.net)
List,
my 3300 Jab idles fairly good at 800 ~ 900 Rpm when i crack the throttle off idle at about 1050 to 1300 it will puff black smoke. at 1500 rpm it will smooth out.
has any one changed jets or needle to fix the idle and low end mixture.
i think if i change the needle jet to a smaller size then it would run too lean at cruise.
this would call for a change in needle configuration.
i gotta do something. any help would be appreciated.
bobby
N131BP
[quote][b]
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gaman(at)att.net
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| Posted: Tue Nov 04, 2008 3:55 pm Post subject: Carburetor |
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Are there members on the list who are completely thrilled with the Bing 64CV? Does anyone have any experience with an alternative?
Thanx,G.Aman 2200 Jabiru/Bing 64CV,380hrs, attached with velcro.
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wypaul
Joined: 08 Jun 2007
Posts: 24
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| Posted: Thu Nov 20, 2008 6:23 am Post subject: Re: Carburetor |
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I am happy with the Bing. 3300 first economy tuning works fine. I thought that I would try it and change to something else if I did not like it but 400 hrs later I'm still happy.
Paul
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Paul Spackman
Q-2 Jabiru 3300 |
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imap8ntr(at)cox.net
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| Posted: Fri Nov 21, 2008 4:34 pm Post subject: Carburetor |
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Paul,
What EGT's are you seeing with the economy tuning kit? Also what is the
transition RPM that you notice from full rich to lean?
I have a ground adjustable prop so this adds a variable without changing
anything on the carburetor. I am seeing EGT's (at 3500ft MSL) in the 1300's
and my transition RPM seems to be at 2900. Thus on climbout at 85kts/2850
RPM I am not yet at full rich since I am less than 2900 RPM.
Thanks
Ivan
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wypaul
Joined: 08 Jun 2007
Posts: 24
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| Posted: Thu Nov 27, 2008 7:41 am Post subject: Re: Carburetor |
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I am seeing 1375 F at peak which happens at about 2750. I usually climbout at about 3000 RPM with the EGT at 1325 F. Climbout is from 5300 FT most of the time. I do most of my flying between 10 and 13 K and tend to run the engine at 2900 for cruise.
I guess I do not know enough about CV carbs to be able to say where the slide is at full throttle on climbout at 3000 RPM. It would be nice to be able to have a prop that could be adjusted in flight so the engine could develop max torq and HP when you wanted it.
Maybe Jim or Pete can give us some insight about the CV operation at full throttle but less than max RPM when the engine is loaded down.
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Paul Spackman
Q-2 Jabiru 3300 |
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K Dilks
Joined: 22 Sep 2008
Posts: 108
Location: UK
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| Posted: Thu Dec 04, 2008 6:04 am Post subject: Re: Carburetor |
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As rule of thumb, % power is close to the % opening on the slide. The slide "sees" the manifold pressure so they are always linked.
Similar carbs on the Rotax
Regards
kev
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