 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
aerobiz1(at)gmail.com
Guest
|
 Posted: Sat Jan 14, 2012 11:12 pm Post subject: Bing 64 Idle circuit inlet aperture drilling 3300A |
 |
|
Is the LLD you drilled to 1.5mm  the air bleed at the intake bellmouth or the fuel jet in the float bowl that feeds the starting jet(choke) ?
If the airbleed then you would be looking at turning out the idle mixture screw a bit more than 1/4 to 1 turn. Â More like 1.5 to 2 turns. If it is the jet in the float bowl, it shouldn't have made any difference to the mixture unless the choke is activated for starting. Â It sounds like you should have eliminated any induction leaks, although a spray at all the joints with WD40 while the engine is idling will tell you if there is still a leak. Â Make sure that the idle speed of 800 rpm is with the throttle physically pulled all the way.
Martin
On Sun, Jan 15, 2012 at 4:53 PM, Thruster87 <alania(at)optusnet.com.au (alania(at)optusnet.com.au)> wrote:
[quote] --> JabiruEngine-List message posted by: "Thruster87" <alania(at)optusnet.com.au (alania(at)optusnet.com.au)>
I've been having trouble getting my mixtures correct as on turning base and bringing back the rpm below 2000 it starts to surge down to 1500rpm and then up 300 rpm and if I pull back below 1500 it surges and then stops.On the ground all seems OK, idles at 800rpm and static runs to 2800 rpm with no surging.It is still set to factory jetting [3300A solid lifter with 30hrs only].What I have done so far is to pull the induction system apart and re-seal it.Drilled out the LLD to 1.5mm and trying with diff positions for the mixture adj.1/4 turn back from fully screwed up into the carb and then turning clockwise 1 full turn. with still the same results  but running a bit hotter.Checked fuel bowl level OK. Any ideas  [looking at changing the jetting next] Carby fed by engine driven pump and electric pump. On a 601xlb
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=363808#363808
===========
-
ine-List" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List
===========
MS -
k">http://forums.matronics.com
===========
e -
     -Matt Dralle, List Admin.
t="_blank">http://www.matronics.com/contribution
===========
[b]
| | - 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 |
|
|
|
| Back to top |
|
 |
Thruster87
Joined: 16 Apr 2008
Posts: 193
Location: Australia
|
| Posted: Sun Jan 15, 2012 12:56 am Post subject: Re: Bing 64 Idle circuit inlet aperture drilling 3300A |
|
|
[quote="aerobiz1(at)gmail.com"]Is the LLD you drilled to 1.5mm  the air bleed at the intake bellmouth or the fuel jet in the float bowl that feeds the starting jet(choke) ?
Yes it was at the bellmouth [small brass orifice intake side bottom].Turning the mixture screw further clockwise,wouldn't that just lean out the mixture thus also increasing the temps and with the surging problem it feels like it's not getting enough fuel?
| | - 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 |
|
|
|
| Back to top |
|
|
aerobiz1(at)gmail.com
Guest
|
| Posted: Sun Jan 15, 2012 2:01 am Post subject: Bing 64 Idle circuit inlet aperture drilling 3300A |
|
|
There are two airbleeds if I remember correctly. Â One is the idle air bleed on the LH side of the bellmouth, and the centre one feeds the emulsion tube and needle jet ( this can also be drilled - to 3/16"). Â Turning clockwise will reduce fuel flow and thereby lean the mixture. That's why I suggested at least 2 turns out ( counterclockwise). On a stock set-up, the idle mixture screw has minimal effect. Â Drilling out the airbleed helps. Going to the next size richer idle jet (pilot jet) can help as well ( from say #35 to #40 )
Marty
On Sun, Jan 15, 2012 at 6:56 PM, Thruster87 <alania(at)optusnet.com.au (alania(at)optusnet.com.au)> wrote:
[quote] --> JabiruEngine-List message posted by: "Thruster87" <alania(at)optusnet.com.au (alania(at)optusnet.com.au)>
[quote="aerobiz1(at)gmail.com"]Is the LLD you drilled to 1.5mm  the air bleed at the intake bellmouth or the fuel jet in the float bowl that feeds the starting jet(choke) ?
Yes it was at the bellmouth [small brass orifice intake side bottom].Turning the mixture screw further clockwise,wouldn't that just lean out the mixture thus also increasing the temps and with the surging problem it feels like it's not getting enough fuel?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=363814#363814
===========
-
ine-List" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List
===========
MS -
k">http://forums.matronics.com
===========
e -
     -Matt Dralle, List Admin.
t="_blank">http://www.matronics.com/contribution
===========
[b]
| | - 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 |
|
|
|
| Back to top |
|
|
aerobiz1(at)gmail.com
Guest
|
| Posted: Sun Jan 15, 2012 2:02 am Post subject: Bing 64 Idle circuit inlet aperture drilling 3300A |
|
|
Have you checked the actual pilot jet ? It is possible that it may simply be obstructed . Â Not uncommon to find it blocked or partially restricted.
Marty
On Sun, Jan 15, 2012 at 7:27 PM, James, Clive R <clive.james(at)uk.bp.com (clive.james(at)uk.bp.com)> wrote:
[quote]--> JabiruEngine-List message posted by: "James, Clive R" <clive.james(at)uk.bp.com (clive.james(at)uk.bp.com)>
Can you not set the idle mixture with the engine running?
You can find the spread of screw position where it will run smoothly (rich to lean and back to rich) and then try either end to see what's best when flying.
Certainly a strange one.
Regards, Clive
--
| | - 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 |
|
|
|
| Back to top |
|
|
dons701
Joined: 22 May 2009
Posts: 80
Location: Hershey, PA
|
| Posted: Sun Jan 15, 2012 2:43 pm Post subject: Re: Bing 64 Idle circuit inlet aperture drilling 3300A |
|
|
Hi
The idle air bleed needs to be drilled to 1.6mm or, .0629, or a 1/16" drill bit will do. As others have said, turning out is "rich" in "lean".
The idle mixture screw is essentially an adjustable throttle because it controls the volume of the emulsion of air from the air bleed AND fuel from the idle jet. What determines rich or lean in the end is actually the relationship between airflow from the clearance around the throttle blade and the volume of air and fuel coming from the idle port located just downstream of the throttle blade.
Oddly your troubles seem to start when preparing to land. Besides reduction of throttle to 2000 rpm, what else is done? Do you turn on the fuel pump? Carb heat? What is the fuel pressure at this moment? My ultimate guess is that the engine is at the rich limit such that when pulled to idle the "fire goes out". What are your exhaust temps at full throttle and cruise? .......DonB
| | - 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 |
|
_________________
Zenith 701 #76120
Jabiru 2200A #2456 95 hours
Sensenich Wood 64-PJ-36 Prop |
|
| Back to top |
|
|
Thruster87
Joined: 16 Apr 2008
Posts: 193
Location: Australia
|
| Posted: Mon Jan 16, 2012 2:11 am Post subject: Re: Bing 64 Idle circuit inlet aperture drilling 3300A |
|
|
Spoke to the people at Jabiru today and in their testing, screwing the mixture in or out made very little difference to the engine operation.They are a bit baffled by the surging.They advised the things to check are ,any balance tube obstructions,float levels, maybe drop the float 1-2mm so will check these out next. Cheers T87
| | - 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 |
|
|
|
| Back to top |
|
|
aerobiz1(at)gmail.com
Guest
|
| Posted: Mon Jan 16, 2012 2:34 am Post subject: Bing 64 Idle circuit inlet aperture drilling 3300A |
|
|
Why doesn't that surprise me.
Anyway, the point of drilling out the idle airbleed in the first place is so that we can get the idle mixture system working. Â If you cannot get the engine to respond via turning the idle mixture screw all the way in , then say 3 turns out, then we have one of two scenarios....
1. You need to go to a larger pilot jet (my preference)Â
2. It is not mixture related, at least not in the area we are playing with.
Marty
On Mon, Jan 16, 2012 at 8:11 PM, Thruster87 <alania(at)optusnet.com.au (alania(at)optusnet.com.au)> wrote:
[quote]--> JabiruEngine-List message posted by: "Thruster87" <alania(at)optusnet.com.au (alania(at)optusnet.com.au)>
Spoke to the people at Jabiru today and in their testing, screwing the mixture in or out made very little difference to the engine operation.They are a bit baffled by the surging.They advised the things to check are ,any balance tube obstructions,float levels, maybe drop the float 1-2mm so will check these out next. Cheers T87
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=363972#363972
===========
-
ine-List" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List
===========
MS -
k">http://forums.matronics.com
===========
e -
     -Matt Dralle, List Admin.
t="_blank">http://www.matronics.com/contribution
===========
[b]
| | - 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 |
|
|
|
| Back to top |
|
|
Clive J
Joined: 03 Nov 2007
Posts: 340
Location: UK
|
| Posted: Mon Jan 16, 2012 2:55 am Post subject: Bing 64 Idle circuit inlet aperture drilling 3300A |
|
|
It is a strange one and frankly the idle jet was a long shot, especially as it idles well.
Can you explain the ‘surging’ does is rev up and down like you were operating the throttle?
A little bit more about what happens and when?
CJ
From: owner-jabiruengine-list-server(at)matronics.com [mailto:owner-jabiruengine-list-server(at)matronics.com] On Behalf Of Martin Hone
Sent: 16 January 2012 10:32
To: jabiruengine-list(at)matronics.com
Subject: Re: JabiruEngine-List: Re: Bing 64 Idle circuit inlet aperture drilling 3300A
Why doesn't that surprise me.
Anyway, the point of drilling out the idle airbleed in the first place is so that we can get the idle mixture system working. If you cannot get the engine to respond via turning the idle mixture screw all the way in , then say 3 turns out, then we have one of two scenarios....
1. You need to go to a larger pilot jet (my preference)
2. It is not mixture related, at least not in the area we are playing with.
Marty
On Mon, Jan 16, 2012 at 8:11 PM, Thruster87 <alania(at)optusnet.com.au (alania(at)optusnet.com.au)> wrote:
--> JabiruEngine-List message posted by: "Thruster87" <alania(at)optusnet.com.au (alania(at)optusnet.com.au)>
Spoke to the people at Jabiru today and in their testing, screwing the mixture in or out made very little difference to the engine operation.They are a bit baffled by the surging.They advised the things to check are ,any balance tube obstructions,float levels, maybe drop the float 1-2mm so will check these out next. Cheers T87
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=363972#363972
===========
-
ine-List" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List
===========
MS -
k">http://forums.matronics.com
===========
e -
-Matt Dralle, List Admin.
t="_blank">http://www.matronics.com/contribution
===========
| Quote: | | _-============================================================_-=Â Â Â Â Â Â Â Â Â - The JabiruEngine-List Email Forum -_-= Use the Matronics List Features Navigator to browse_-= the many List utilities such as List Un/Subscription,_-= Archive Search & Download, 7-Day Browse, Chat, FAQ,_-= Photoshare, and much much more:_-=_-=Â Â --> http://www.matronics.com/Navigator?JabiruEngine-List |
0123456789 | Quote: | | _-============================================================ |
0 | Quote: | | _-============================================================ |
1 | Quote: | | _-============================================================ |
2 | Quote: | | _-============================================================ |
3
| | - 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 |
|
|
|
| Back to top |
|
|
Thruster87
Joined: 16 Apr 2008
Posts: 193
Location: Australia
|
| Posted: Mon Jan 16, 2012 7:15 pm Post subject: Re: Bing 64 Idle circuit inlet aperture drilling 3300A |
|
|
I have not really had a chance to play around with the throttle while concentrating on flying other then pushing the throttle [back over 2000rpm] in so as not to stall it and then once on short final going to idle and been high enough to clear the fence as the engine stalls.Once on the runway I put a 1/8" throttle on and it starts and purrs just as it should and taxi back to hangar .Local glider pilot CFI has recommended me for the silver gliding star award. The other strange thing was just before Xmas I did my BFR with stalling etc at 4500 ft with no engine problems other then once on short final it stalled but this time the CFI hit the starter button and I just concentrated on the landing phase as normal once the engine started again. Cheers Alan Bing Germany sent me the following web site to have a look at http://www.bingpower.de/english/service/einstellblaetter.html
| | - 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 |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
