Today's Message Index:
----------------------
1. 09:43 AM - Pressure Carburetor? (Matthew J. Hawkins)
2. 11:07 AM - Re: Pressure Carburetor? (John Vormbaum)
3. 11:40 AM - Re: Pressure Carburetor? (Matthew J. Hawkins)
4. 02:10 PM - Re: Pressure Carburetor? (Don Girod)
5. 07:03 PM - Re: Pressure Carburetor? (CloudCraft@aol.com)
6. 07:13 PM - Re: Pressure Carburetor? (WINGFLYER1@aol.com)
7. 07:39 PM - Re: Pressure Carburetor? (yourtcfg@aol.com)
8. 07:45 PM - Re: Pressure Carburetor? (yourtcfg@aol.com)
9. 11:21 PM - Re: Pressure Carburetor? (Robert S. Randazzo)
Message 1
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| Subject: | Pressure Carburetor? |
All-
Anybody have a good shop they'd recommend that's familiar with working on/overhauling
the older pressure carburetors? We sent the left carb on N2760B out to
one shop - and it came back better in some ways - but mixture is either full
rich or idle cut-off. No adjustment in between.
We've gone through the cabling and linkage and all looks good. We think it's internal
to the carburetor at this point. Not sure, but the shop we used may have
messed something up.
Engines are G0-480-D1A's
Thoughts? Recommendations?
Matt
By the way, on our previous problem (engine skip/roughness when reducing power
through 21" manifold pressure) was exactly as one of you suggested - improperly
adjusted carb heat linkage. Many thanks on that one!
********************
Matthew Hawkins
Director, Marine Ops
R/V HUGH R. SHARP
302-645-4341
FAX: 302-645-4006
hawkins@udel.edu
Message 2
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| Subject: | Re: Pressure Carburetor? |
Matt,
Isn't that exactly how a pressure carb is supposed to work? It's
automatic mixture control with altitude. IIRC, you leave the levers in
full rich for all segments of the flight and the carbs do the rest.
Sounds like the shop did a fine job on your overhaul.
Cheers,
/John
Matthew J. Hawkins wrote:
>
> All-
>
> Anybody have a good shop they'd recommend that's familiar with working on/overhauling
the older pressure carburetors? We sent the left carb on N2760B out
to one shop - and it came back better in some ways - but mixture is either full
rich or idle cut-off. No adjustment in between.
>
> We've gone through the cabling and linkage and all looks good. We think it's
internal to the carburetor at this point. Not sure, but the shop we used may
have messed something up.
>
> Engines are G0-480-D1A's
>
> Thoughts? Recommendations?
>
> Matt
>
> By the way, on our previous problem (engine skip/roughness when reducing power
through 21" manifold pressure) was exactly as one of you suggested - improperly
adjusted carb heat linkage. Many thanks on that one!
>
> ********************
> Matthew Hawkins
> Director, Marine Ops
> R/V HUGH R. SHARP
> 302-645-4341
> FAX: 302-645-4006
> hawkins@udel.edu
>
>
> __________ NOD32 2521 (20070911) Information __________
>
>
>
Message 3
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| Subject: | Pressure Carburetor? |
Hmmm - now I'm going to have to show my (our) ignorance here! Maybe the right
one is what needs to be corrected! The right WILL lean out as you adjust the
mixture control.
Anybody else have thoughts?
Matt
-----Original Message-----
From: owner-commander-list-server@matronics.com [mailto:owner-commander-list-server@matronics.com] On Behalf Of John Vormbaum
Sent: Wednesday, September 26, 2007 2:08 PM
Subject: Re: Commander-List: Pressure Carburetor?
Matt,
Isn't that exactly how a pressure carb is supposed to work? It's automatic mixture
control with altitude. IIRC, you leave the levers in full rich for all segments
of the flight and the carbs do the rest. Sounds like the shop did a fine
job on your overhaul.
Cheers,
/John
Matthew J. Hawkins wrote:
> --> <hawkins@cms.udel.edu>
>
> All-
>
> Anybody have a good shop they'd recommend that's familiar with working
> on/overhauling the older pressure carburetors? We sent the left carb
> on N2760B out to one shop - and it came back better in some ways - but
> mixture is either full rich or idle cut-off. No adjustment in
> between.
>
> We've gone through the cabling and linkage and all looks good. We
> think it's internal to the carburetor at this point. Not sure, but the
> shop we used may have messed something up.
>
> Engines are G0-480-D1A's
>
> Thoughts? Recommendations?
>
> Matt
>
> By the way, on our previous problem (engine skip/roughness when
> reducing power through 21" manifold pressure) was exactly as one of
> you suggested - improperly adjusted carb heat linkage. Many thanks on
> that one!
>
> ********************
> Matthew Hawkins
> Director, Marine Ops
> R/V HUGH R. SHARP
> 302-645-4341
> FAX: 302-645-4006
> hawkins@udel.edu
>
>
> __________ NOD32 2521 (20070911) Information __________
>
>
Message 4
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| Subject: | Re: Pressure Carburetor? |
They don't call them Bendix auto pressure carbs. for nothing!
I have been told that when I level off, say 8K or above, to pull it back
gently then push it back to full rich. So that is what I do.
Don
----- Original Message -----
From: "Matthew J. Hawkins" <hawkins@cms.udel.edu>
Sent: Wednesday, September 26, 2007 2:39 PM
Subject: RE: Commander-List: Pressure Carburetor?
> <hawkins@cms.udel.edu>
>
> Hmmm - now I'm going to have to show my (our) ignorance here! Maybe the
> right one is what needs to be corrected! The right WILL lean out as you
> adjust the mixture control.
>
> Anybody else have thoughts?
>
> Matt
>
> -----Original Message-----
> From: owner-commander-list-server@matronics.com
> [mailto:owner-commander-list-server@matronics.com] On Behalf Of John
> Vormbaum
> Sent: Wednesday, September 26, 2007 2:08 PM
> To: commander-list@matronics.com
> Subject: Re: Commander-List: Pressure Carburetor?
>
>
>
> Matt,
>
> Isn't that exactly how a pressure carb is supposed to work? It's automatic
> mixture control with altitude. IIRC, you leave the levers in full rich for
> all segments of the flight and the carbs do the rest. Sounds like the shop
> did a fine job on your overhaul.
>
> Cheers,
>
> /John
>
> Matthew J. Hawkins wrote:
>> --> <hawkins@cms.udel.edu>
>>
>> All-
>>
>> Anybody have a good shop they'd recommend that's familiar with working
>> on/overhauling the older pressure carburetors? We sent the left carb
>> on N2760B out to one shop - and it came back better in some ways - but
>> mixture is either full rich or idle cut-off. No adjustment in
>> between.
>>
>> We've gone through the cabling and linkage and all looks good. We
>> think it's internal to the carburetor at this point. Not sure, but the
>> shop we used may have messed something up.
>>
>> Engines are G0-480-D1A's
>>
>> Thoughts? Recommendations?
>>
>> Matt
>>
>> By the way, on our previous problem (engine skip/roughness when
>> reducing power through 21" manifold pressure) was exactly as one of
>> you suggested - improperly adjusted carb heat linkage. Many thanks on
>> that one!
>>
>> ********************
>> Matthew Hawkins
>> Director, Marine Ops
>> R/V HUGH R. SHARP
>> 302-645-4341
>> FAX: 302-645-4006
>> hawkins@udel.edu
>>
>>
>>
>>
>>
>>
>> __________ NOD32 2521 (20070911) Information __________
>>
>>
>>
>>
>>
>
>
> --
> 9/26/2007 12:12 PM
>
>
Message 5
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| Subject: | Re: Pressure Carburetor? |
In a message dated 26-Sep-07 11:08:51 Pacific Daylight Time,
john@vormbaum.com writes:
Isn't that exactly how a pressure carb is supposed to work? It's automatic
mixture control with altitude
Kinda.
The "Auto Lean" should lean with an increase in altitude and vice versa.
These can also be manually leaned and sometimes need to be if the auto lean
isn't working.
Evidence of auto lean not working is fogging of one (or both) exhausts,
excessive carbon or black soot in the stacks after a flight.
I once flew an AC-680E with one shot diaphragm and had to hold the mixture
of that engine in a lean position for as much as I could between California
and Florida. The mixture control would not stay where I wanted it in the
manual leaned position and that got tedious. Upon delivery, the pressure carbs
got sent to a rebuild shop with Mr. Kernick's direction.
The idea is to have properly operating pressure carbs that lean / enrichen
automatically.
By the way, those of you with pressure carbs, when you shut down the engine,
do not leave the mixtures in idle cut off. This will stretch out and dry out
the diaphragms.
So put them back in full rich when your Commander is sleeping.
Wing Commander Gordon
Message 6
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| Subject: | Re: Pressure Carburetor? |
I heard that, if you have neoprene gaskets,diaphrams etc. installed @
carburator over-haul, you can then leave the mixture in the off position. It seems
that I also heard that a bullitin was issued recommending that neoprene be
installed. Any one know for sure about this? Thanks Gil- Wingflyer
Message 7
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| Subject: | Re: Pressure Carburetor? |
HI MATT.?
It sounds to me like the carb is working properly.? You should never manually lean
your carbs except in case of emergency (like WCG described).? Many years ago
I bought a 560A and as I flew it home I literally read the flight manual, on
my lap,?since I had no idea how to fly the thing.? The manual states that is
is possible to manually?lean the airplane above 10,000 feet.? So, as I crossed
the Rocky Mts, at 12Kt, I decided to lean the engines.? They were running perfect,
but I just could not leave well enough alone.? Well, I learned a couple
of things about Commanders!!? First, you don't need to lean the stinking carbs!!?
Second, whenever you do anything to a twin engine airplane, do it?one engine
at a time.? I reached for the mixture levers and moved them back about 1/2
way.? Nothing happened??? As I continued to pull them back a bit more, BOTH engines
quit cold!!? The silence was defining.? It only took about one millisecond
to get the mixtures back forward.
If you read the lettering on your power quadrant, you will notice that the mixtures
are not labeled "rich" & "lean".? Instead, they say "normal" & "idle cut
off" (Stop & go).
I think you new carb is working great and I wonder why the old carb will allow
you to lean it??? jb
-----Original Message-----
From: Matthew J. Hawkins <hawkins@cms.udel.edu>
Sent: Wed, 26 Sep 2007 9:43 am
Subject: Commander-List: Pressure Carburetor?
All-
Anybody have a good shop they'd recommend that's familiar with working
on/overhauling the older pressure carburetors? We sent the left carb on N2760B
out to one shop - and it came back better in some ways - but mixture is either
full rich or idle cut-off. No adjustment in between.
We've gone through the cabling and linkage and all looks good. We think it's
internal to the carburetor at this point. Not sure, but the shop we used may
have messed something up.
Engines are G0-480-D1A's
Thoughts? Recommendations?
Matt
By the way, on our previous problem (engine skip/roughness when reducing power
through 21" manifold pressure) was exactly as one of you suggested - improperly
adjusted carb heat linkage. Many thanks on that one!
********************
Matthew Hawkins
Director, Marine Ops
R/V HUGH R. SHARP
302-645-4341
FAX: 302-645-4006
hawkins@udel.edu
________________________________________________________________________
Email and AIM finally together. You've gotta check out free AOL Mail! - http://mail.aol.com
Message 8
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| Subject: | Re: Pressure Carburetor? |
The only gaskets available are neopream, (orenge)? You shoud still leave the mix
forward (and the fuel "on") when parked for an extended time, overnight or longer.?
The reason is the diaphrams are streched when pulled to idel cut off and
will quiclky take a "set" if left there.? Leave the fuel on to "flood" the
inside of the carb with fuel to keep all of the pars properly lubed.? Also, although
not officialy sanctiond, you will likly find a can of Mavel mistery Oil
in the hangar of an experianced, presure carb owner.? Used in the fuel system
it will lube the inside of the carbs.? jb
-----Original Message-----
From: WINGFLYER1@aol.com
Sent: Wed, 26 Sep 2007 7:13 pm
Subject: Re: Commander-List: Pressure Carburetor?
I heard that, if you have neoprene gaskets,diaphrams etc. installed?@ carburator
over-haul, you can then leave the mixture in the off position. It seems that
I also heard that a bullitin was issued recommending that neoprene be installed.
Any one know for sure about this? Thanks Gil- Wingflyer
See what's new a_blank">Make AOL Your Homepage.
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Message 9
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| Subject: | Pressure Carburetor? |
Jb-
Good story. Made more so by the fact that you'll admit to having done
something that most of us would attribute to "a friend was flying a
commander.."
Rob
From: owner-commander-list-server@matronics.com
[mailto:owner-commander-list-server@matronics.com] On Behalf Of
yourtcfg@aol.com
Sent: Wednesday, September 26, 2007 7:39 PM
Subject: Re: Commander-List: Pressure Carburetor?
HI MATT.
It sounds to me like the carb is working properly. You should never
manually lean your carbs except in case of emergency (like WCG described).
Many years ago I bought a 560A and as I flew it home I literally read the
flight manual, on my lap, since I had no idea how to fly the thing. The
manual states that is is possible to manually lean the airplane above 10,000
feet. So, as I crossed the Rocky Mts, at 12Kt, I decided to lean the
engines. They were running perfect, but I just could not leave well enough
alone. Well, I learned a couple of things about Commanders!! First, you
don't need to lean the stinking carbs!! Second, whenever you do anything to
a twin engine airplane, do it one engine at a time. I reached for the
mixture levers and moved them back about 1/2 way. Nothing happened?? As I
continued to pull them back a bit more, BOTH engines quit cold!! The
silence was defining. It only took about one millisecond to get the
mixtures back forward.
If you read the lettering on your power quadrant, you will notice that the
mixtures are not labeled "rich" & "lean". Instead, they say "normal" &
"idle cut off" (Stop & go).
I think you new carb is working great and I wonder why the old carb will
allow you to lean it?? jb
-----Original Message-----
From: Matthew J. Hawkins <hawkins@cms.udel.edu>
Sent: Wed, 26 Sep 2007 9:43 am
Subject: Commander-List: Pressure Carburetor?
<hawkins@cms.udel.edu>
All-
Anybody have a good shop they'd recommend that's familiar with working
on/overhauling the older pressure carburetors? We sent the left carb on
N2760B
out to one shop - and it came back better in some ways - but mixture is
either
full rich or idle cut-off. No adjustment in between.
We've gone through the cabling and linkage and all looks good. We think
it's
internal to the carburetor at this point. Not sure, but the shop we used may
have messed something up.
Engines are G0-480-D1A's
Thoughts? Recommendations?
Matt
By the way, on our previous problem (engine skip/roughness when reducing
power
through 21" manifold pressure) was exactly as one of you suggested -
improperly
adjusted carb heat linkage. Many thanks on that one!
********************
Matthew Hawkins
Director, Marine Ops
R/V HUGH R. SHARP
302-645-4341
FAX: 302-645-4006
hawkins@udel.edu
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