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jeffrey-j-paris(at)excite
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 Posted: Sat Apr 18, 2009 12:13 pm Post subject: Help with Economy tuning kit issues |
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Dear Jab Engine Wonks,
Recently I installed the economy tuning kit in our carb after attending Jabiru USA's engine seminar. Pretty easy and straightforward, but I am  having trouble starting the engine when the engine is cold, it just seems it isn't getting enough fuel.Â
To get it going I have had to leave my boost pump on and I really have to manage the choke and throttle or it won't start, while I'm juggling these tasks the engine will catch cough and quit, eventually it starts and runs fine. Â After the engine has been run and as long as it's pretty warm it starts like it should. The only thing that is different in flight is the fact that I'm getting lower fuel reads in terms of fuel burn.
 My Jab used to start on about what seemed the 3rd turn of the prop and run quite well from there on, I'm getting the feeling that if it wasn't broken don't fix it, however, I needed to put in the ethanol resistant floats and the economy kit presentation during the seminar helped convince me that a smoother fuel curve over the wide range of throttle settings might help some CHT issues that I have had in climb and in cruise.  The soot from my exhaust pipes is a nice brown and not a velvety black soot.Â
As of today I again have enrichened the mixture and  I re-adjusted the new ethanol resistant float  to increase my fuel level in the carby. Still I was not able to start my engine and I soon ran the battery to about 10 volts and that won't spin the engine fast enough to get ignition.  I've gone over my cables inspected the whole engine and I don't know what to do to solve the problem, and I'm getting a wee bit tired of going over my engine compartment.Â
Your advice and expertise are greatly appreciated.
Sincerely,
Jeff Paris  JAB 3300 with valves. (old school)
Lawyers Need legal advice? Click here to find a top notch lawyer. Click Here For More Information [quote][b]
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Dick
Joined: 02 Feb 2008
Posts: 12
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| Posted: Sun Apr 19, 2009 5:09 am Post subject: Help with Economy tuning kit issues |
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An engine preheater works wonders. Tannis has a good one for the 3300.
n213rc(at)gmail.com (n213rc(at)gmail.com)
Lightning #42
On Sat, Apr 18, 2009 at 1:11 PM, Jeffrey J Paris <jeffrey-j-paris(at)excite.com (jeffrey-j-paris(at)excite.com)> wrote:
[quote] Dear Jab Engine Wonks,
Recently I installed the economy tuning kit in our carb after attending Jabiru USA's engine seminar. Pretty easy and straightforward, but I am having trouble starting the engine when the engine is cold, it just seems it isn't getting enough fuel.
To get it going I have had to leave my boost pump on and I really have to manage the choke and throttle or it won't start, while I'm juggling these tasks the engine will catch cough and quit, eventually it starts and runs fine. After the engine has been run and as long as it's pretty warm it starts like it should. The only thing that is different in flight is the fact that I'm getting lower fuel reads in terms of fuel burn.
My Jab used to start on about what seemed the 3rd turn of the prop and run quite well from there on, I'm getting the feeling that if it wasn't broken don't fix it, however, I needed to put in the ethanol resistant floats and the economy kit presentation during the seminar helped convince me that a smoother fuel curve over the wide range of throttle settings might help some CHT issues that I have had in climb and in cruise. The soot from my exhaust pipes is a nice brown and not a velvety black soot.
As of today I again have enrichened the mixture and I re-adjusted the new ethanol resistant float to increase my fuel level in the carby. Still I was not able to start my engine and I soon ran the battery to about 10 volts and that won't spin the engine fast enough to get ignition. I've gone over my cables inspected the whole engine and I don't know what to do to solve the problem, and I'm getting a wee bit tired of going over my engine compartment.
Your advice and expertise are greatly appreciated.
Sincerely,
Jeff Paris JAB 3300 with valves. (old school)
Lawyers Need legal advice? Click here to find a top notch lawyer. Click Here For More Information | Quote: |
ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List
ttp://forums.matronics.com
_blank">http://www.matronics.com/contribution
|
[b]
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DaveG601XL
Joined: 27 Oct 2006
Posts: 351
Location: Cincinnati, Oh
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| Posted: Sun Apr 19, 2009 4:48 pm Post subject: Re: Help with Economy tuning kit issues |
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Jeff,
I have seen a similar issue on a different engine, but with the same Bing carb, that all of a sudden, became hard to start. It became difficult to start, but would run fine if it could be started. The owner eventually found a bit of debris in the start circuit fuel tube. When this was throughly cleaned out, no more start problems.
Hope this helps,
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David Gallagher
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plus2s
Joined: 30 Nov 2006
Posts: 65
Location: NEW ZEALAND
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| Posted: Sun Apr 19, 2009 6:23 pm Post subject: Help with Economy tuning kit issues |
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Have you checked your coil gaps? It certainly sounds like a fuel problem but if the coil gaps are too wide it certainly causes starting problems
Regards
Keith
Jab 160
--- On Mon, 20/4/09, Dick Cleavinger <n213rc(at)gmail.com> wrote:
| Quote: | From: Dick Cleavinger <n213rc(at)gmail.com>
Subject: Re: Help with Economy tuning kit issues
To: jabiruengine-list(at)matronics.com
Received: Monday, 20 April, 2009, 1:08 AM
An engine preheater works wonders. Tannis has a good one for the 3300.
n213rc(at)gmail.com (n213rc(at)gmail.com)
Lightning #42
On Sat, Apr 18, 2009 at 1:11 PM, Jeffrey J Paris <jeffrey-j-paris(at)excite.com (jeffrey-j-paris(at)excite.com)> wrote:
| Quote: | Dear Jab Engine Wonks,
Recently I installed the economy tuning kit in our carb after attending Jabiru USA's engine seminar. Pretty easy and straightforward, but I am having trouble starting the engine when the engine is cold, it just seems it isn't getting enough fuel.
To get it going I have had to leave my boost pump on and I really have to manage the choke and throttle or it won't start, while I'm juggling these tasks the engine will catch cough and quit, eventually it starts and runs fine. After the engine has been run and as long as it's pretty warm it starts like it should. The only thing that is different in flight is the fact that I'm getting lower fuel reads in terms of fuel burn.
My Jab used to start on about what seemed the 3rd turn of the prop and run quite well from there on, I'm getting the feeling that if it wasn't broken don't fix it, however, I needed to put in the ethanol resistant floats and the economy kit presentation during the seminar helped convince me that a smoother fuel curve over the wide range of throttle settings might help some CHT issues that I have had in climb and in cruise. The soot from my exhaust pipes is a nice brown and not a velvety black soot.
As of today I again have enrichened the mixture and I re-adjusted the new ethanol resistant float to increase my fuel level in the carby. Still I was not able to start my engine and I soon ran the battery to about 10 volts and that won't spin the engine fast enough to get ignition. I've gone over my cables inspected the whole engine and I don't know what to do to solve the problem, and I'm getting a wee bit tired of going over my engine compartment.
Your advice and expertise are greatly appreciated.
Sincerely,
Jeff Paris JAB 3300 with valves. (old school)
Lawyers Need legal advice? Click here to find a top notch lawyer. Click Here For More Information | Quote: |
ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List
ttp://forums.matronics.com
_blank">http://www.matronics.com/contribution
|
ist" target=_blank rel=nofollow>http://www.matronics.com/Navigator?JabiruEngine-List
=nofollow>http://forums.matronics.com
blank rel=nofollow>http://www.matronics.com/contribution
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[quote][b]
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Clive J
Joined: 03 Nov 2007
Posts: 340
Location: UK
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| Posted: Sun Apr 19, 2009 10:20 pm Post subject: Help with Economy tuning kit issues |
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I was surprised at the sensitivity of the coil gaps, there were a factor in improving two aircraft at my hangar.
Plug gaps can also be closed on one set to improve starting when cranking seems to be the issue.
The symptoms you describe are just as we experience with one 3300 in the cold weather (UK). One thing we find helps is many hand props to suck fuel out the starting jet (fuel pump run first to top up bowl).
Fact is the starting system is too lean as you rightly observe which makes everything else critical.
Have fun, we did.
Regards, Clive
P.S. you have put the earth cable on the forward end of the starter motor mount bolt? Under the bolt head, also a worthwhile exercise.
From: owner-jabiruengine-list-server(at)matronics.com [mailto:owner-jabiruengine-list-server(at)matronics.com] On Behalf Of Keith Pickford
Sent: 20 April 2009 03:23
To: jabiruengine-list(at)matronics.com
Subject: Re: Help with Economy tuning kit issues
Have you checked your coil gaps? It certainly sounds like a fuel problem but if the coil gaps are too wide it certainly causes starting problems
Regards
Keith
Jab 160
--- On Mon, 20/4/09, Dick Cleavinger <n213rc(at)gmail.com> wrote:
| Quote: | From: Dick Cleavinger <n213rc(at)gmail.com>
Subject: Re: Help with Economy tuning kit issues
To: jabiruengine-list(at)matronics.com
Received: Monday, 20 April, 2009, 1:08 AM
An engine preheater works wonders. Tannis has a good one for the 3300.
n213rc(at)gmail.com (n213rc(at)gmail.com)
Lightning #42
On Sat, Apr 18, 2009 at 1:11 PM, Jeffrey J Paris <jeffrey-j-paris(at)excite.com (jeffrey-j-paris(at)excite.com)> wrote:
| Quote: | Dear Jab Engine Wonks,
Recently I installed the economy tuning kit in our carb after attending Jabiru USA's engine seminar. Pretty easy and straightforward, but I am having trouble starting the engine when the engine is cold, it just seems it isn't getting enough fuel.
To get it going I have had to leave my boost pump on and I really have to manage the choke and throttle or it won't start, while I'm juggling these tasks the engine will catch cough and quit, eventually it starts and runs fine. After the engine has been run and as long as it's pretty warm it starts like it should. The only thing that is different in flight is the fact that I'm getting lower fuel reads in terms of fuel burn.
My Jab used to start on about what seemed the 3rd turn of the prop and run quite well from there on, I'm getting the feeling that if it wasn't broken don't fix it, however, I needed to put in the ethanol resistant floats and the economy kit presentation during the seminar helped convince me that a smoother fuel curve over the wide range of throttle settings might help some CHT issues that I have had in climb and in cruise. The soot from my exhaust pipes is a nice brown and not a velvety black soot.
As of today I again have enrichened the mixture and I re-adjusted the new ethanol resistant float to increase my fuel level in the carby. Still I was not able to start my engine and I soon ran the battery to about 10 volts and that won't spin the engine fast enough to get ignition. I've gone over my cables inspected the whole engine and I don't know what to do to solve the problem, and I'm getting a wee bit tired of going over my engine compartment.
Your advice and expertise are greatly appreciated.
Sincerely,
Jeff Paris JAB 3300 with valves. (old school)
Lawyers Need legal advice? Click here to find a top notch lawyer. Click Here For More Information | Quote: |
ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List
ttp://forums.matronics.com
_blank">http://www.matronics.com/contribution
|
ist" target=_blank rel=nofollow>http://www.matronics.com/Navigator?JabiruEngine-List
=nofollow>http://forums.matronics.com
blank rel=nofollow>http://www.matronics.com/contribution
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[quote]
href="http://www.matronics.com/Navigator?JabiruEngine-List">http://www.matronics.com/Navigator?JabiruEngine-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
[b]
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dhonabach
Joined: 19 Jan 2009
Posts: 13
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| Posted: Thu Apr 23, 2009 10:11 am Post subject: Re: Help with Economy tuning kit issues |
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A lot of folks have gone about their Bing Carb issues by changing out the needles, etc. What I've found is that the air intake system will make a huge swing on performance, EGTs and can fix things just as well.
While I think this is a long shot, it only takes a few minutes to try and would eliminate it from the possible problem list:
Block up your air intake port on the cowl and then remove the air-intake tubing from the carb so it draws air from inside the cowl and then finally try starting cold. If it works, then you have an air intake system issue.
As they say, it is either fuel, air, or spark 
Don
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