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jeromedelamare(at)free.fr
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 Posted: Tue Aug 25, 2009 1:47 pm Post subject: ROP versus LOP... How to lean a bing |
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--> JabiruEngine-List message posted by: Lynn Matteson <lynnmatt(at)jps.net>
.../ Mine wasn't until I
installed the Rotec TBI-40 with its mixture control. Stuck with a
Bing, I wasn't able to try this operation/...
Hi Lynn,
It's quite easy to lean a bing. You just have to create a low pressure in the fuel bowl. The lower pressure you have, the more you lean.
Some people use the engine low pressure. I think HACman use this method :
http://www.greenskyadventures.com/bing/4strokePG2.htm
Other people use an homemade air pump. The same kind of pump that you can find in a vacuum cleaner. This pump is located between the air box and the fuel bowl. With this method you can have an electric control of the mixture (partial vacuum depends on rpm). It's very safe because you just have to switch off the vacuum pump and you run a "normal bing".
How simple is it ? (see picture)
[img]cid:image002.jpg(at)01CA25DA.C92C6AB0[/img]
This system has been designed by Michel Colomban. Michel Colomban is the designer of the Cricri (http://flight.cz/cricri/english/cri-cri-photos-pictures-cameron.php) and other airplanes like Bambi, MCR and Luciole.
With this system you can obtain a leaner mixture but not a richer one. So if you want to lean a bing, you need to apply JSB 18 in order to have a rich mixture in “normal” operation.
Jérôme
Jabiru #3144, MCR, Sensenich Carbon
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BobsV35B(at)aol.com
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| Posted: Tue Aug 25, 2009 2:22 pm Post subject: ROP versus LOP... How to lean a bing |
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Good Evening Jerome,
Pretty cool!
More than one way to skin that cat.
Happy Skies,
Old Bob
In a message dated 8/25/2009 4:47:54 P.M. Central Daylight Time, jeromedelamare(at)free.fr writes:
| Quote: |
--> JabiruEngine-List message posted by: Lynn Matteson <lynnmatt(at)jps.net>
.../ Mine wasn't until I
installed the Rotec TBI-40 with its mixture control. Stuck with a
Bing, I wasn't able to try this operation/...
Hi Lynn,
It's quite easy to lean a bing. You just have to create a low pressure in the fuel bowl. The lower pressure you have, the more you lean.
Some people use the engine low pressure. I think HACman use this method :
http://www.greenskyadventures.com/bing/4strokePG2.htm
Other people use an homemade air pump. The same kind of pump that you can find in a vacuum cleaner. This pump is located between the air box and the fuel bowl. With this method you can have an electric control of the mixture (partial vacuum depends on rpm). It's very safe because you just have to switch off the vacuum pump and you run a "normal bing".
How simple is it ? (see picture)
This system has been designed by Michel Colomban. Michel Colomban is the designer of the Cricri (http://flight.cz/cricri/english/cri-cri-photos-pictures-cameron.php) and other airplanes like Bambi, MCR and Luciole.
With this system you can obtain a leaner mixture but not a richer one. So if you want to lean a bing, you need to apply JSB 18 in order to have a rich mixture in “normal†operation.
Jérôme
Jabiru #3144, MCR, Sensenich Carbon
|
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http://www.matronics.com/Navigator?JabiruEngine-List |
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Tue Aug 25, 2009 4:21 pm Post subject: ROP versus LOP... How to lean a bing |
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Hi Jerome-
If I understand this system correctly, you are putting a vacuum (low
pressure) on the float bowl, so the engine is fighting against this
vacuum to get its fair share of fuel, right? So it goes lean if you
put enough vacuum on the float bowl?
Somebody local told me about his leaning device, and it sounded
pretty much the same. I think he used the vacuum from the engine
going through a needle valve to control the vacuum, if I understood
him correctly.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 744.1 hrs
Sensenich 62"x46" Wood prop
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying
On Aug 25, 2009, at 5:28 PM, Jérôme Delamare wrote:
| Quote: |
<lynnmatt(at)jps.net>
.../ Mine wasn't until I
installed the Rotec TBI-40 with its mixture control. Stuck with a
Bing, I wasn't able to try this operation/...
Hi Lynn,
It's quite easy to lean a bing. You just have to create a low
pressure in the fuel bowl. The lower pressure you have, the more
you lean.
Some people use the engine low pressure. I think HACman use this
method :
http://www.greenskyadventures.com/bing/4strokePG2.htm
Other people use an homemade air pump. The same kind of pump that
you can find in a vacuum cleaner. This pump is located between the
air box and the fuel bowl. With this method you can have an
electric control of the mixture (partial vacuum depends on rpm).
It's very safe because you just have to switch off the vacuum pump
and you run a "normal bing".
How simple is it ? (see picture)
This system has been designed by Michel Colomban. Michel Colomban
is the designer of the Cricri (http://flight.cz/cricri/english/cri-
cri-photos-pictures-cameron.php) and other airplanes like Bambi,
MCR and Luciole.
With this system you can obtain a leaner mixture but not a richer
one. So if you want to lean a bing, you need to apply JSB 18 in
order to have a rich mixture in “normal” operation.
Jérôme
Jabiru #3144, MCR, Sensenich Carbon
|
| | - 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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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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aslsa.rng(at)gmail.com
Guest
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| Posted: Tue Aug 25, 2009 6:09 pm Post subject: ROP versus LOP... How to lean a bing |
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Lynn, One of the guys on the Kolb list has been experimenting with mixture control in the way you describe. Seems to work.
Rick Girard
On Tue, Aug 25, 2009 at 7:19 PM, Lynn Matteson <lynnmatt(at)jps.net (lynnmatt(at)jps.net)> wrote:
[quote]--> JabiruEngine-List message posted by: Lynn Matteson <lynnmatt(at)jps.net (lynnmatt(at)jps.net)>
Hi Jerome-
If I understand this system correctly, you are putting a vacuum (low pressure) on the float bowl, so the engine is fighting against this vacuum to get its fair share of fuel, right? So it goes lean if you put enough vacuum on the float bowl?
Somebody local told me about his leaning device, and it sounded pretty much the same. I think he used the vacuum from the engine going through a needle valve to control the vacuum, if I understood him correctly.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 744.1 hrs
Sensenich 62"x46" Wood prop
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying
On Aug 25, 2009, at 5:28 PM, Jérôme Delamare wrote:
| Quote: | --> JabiruEngine-List message posted by: Lynn Matteson <lynnmatt(at)jps.net (lynnmatt(at)jps.net)>
../ Mine wasn't until I
installed the Rotec TBI-40 with its mixture control. Stuck with a
Bing, I wasn't able to try this operation/...
Hi Lynn,
It's quite easy to lean a bing. You just have to create a low pressure in the fuel bowl. The lower pressure you have, the more you lean.
Some people use the engine low pressure. I think HACman use this method :
http://www.greenskyadventures.com/bing/4strokePG2.htm
Other people use an homemade air pump. The same kind of pump that you can find in a vacuum cleaner. This pump is located between the air box and the fuel bowl. With this method you can have an electric control of the mixture (partial vacuum depends on rpm). It's very safe because you just have to switch off the vacuum pump and you run a "normal bing".
How simple is it ? (see picture)
This system has been designed by Michel Colomban. Michel Colomban is the designer of the Cricri (http://flight.cz/cricri/english/cri-cri-photos-pictures-cameron.php) and other airplanes like Bambi, MCR and Luciole.
With this system you can obtain a leaner mixture but not a richer one. So if you want to lean a bing, you need to apply JSB 18 in order to have a rich mixture in “normal” operation.
Jérôme
Jabiru #3144, MCR, Sensenich Carbon
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jeromedelamare(at)free.fr
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| Posted: Tue Aug 25, 2009 11:15 pm Post subject: ROP versus LOP... How to lean a bing |
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You understand this system correctly Lynn.
The advantage of the electric pump is the ability to be controlled by an
electronic device. So, a cab engine can be controlled like an injected one.
Electronic Controlled carb advantages :
- Very easy to adapt
- no problem in case of electric failure
Electronic controlled Injection advantage (single injector) :
- better fuel vaporization (as Ellison and Rotec TBI)
But, as a lot of people reports, the big deal is to balance the intake of
the engine...
Jérôme
--
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
|
| Posted: Wed Aug 26, 2009 2:53 am Post subject: ROP versus LOP... How to lean a bing |
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Well then, I've got the best of all possible worlds, because I've got
a gravity feed fuel flow into the Rotec TBI, and if all electrical
systems fail, I've still got fuel. Of course, with my Electroair
ignition system, I still need a battery...but then, I've got two of
them, so I'm good to go, unless I'm REALLY havin' a BAD DAY! : )
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 744.1 hrs
Sensenich 62"x46" Wood prop
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying
On Aug 26, 2009, at 3:03 AM, Jérôme Delamare wrote:
| Quote: |
J=E9r=F4me_Delamare?= <jeromedelamare(at)free.fr>
You understand this system correctly Lynn.
The advantage of the electric pump is the ability to be controlled
by an
electronic device. So, a cab engine can be controlled like an
injected one.
Electronic Controlled carb advantages :
- Very easy to adapt
- no problem in case of electric failure
Electronic controlled Injection advantage (single injector) :
- better fuel vaporization (as Ellison and Rotec TBI)
But, as a lot of people reports, the big deal is to balance the
intake of
the engine...
Jérôme
|
| | - 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 |
|
_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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