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dean.psiropoulos(at)veriz
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 Posted: Wed Dec 31, 2008 12:40 pm Post subject: Lousy idle |
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Anyone have a few words of wisdom for me:
I'm pulling my hair out over a crappy engine idle that I can't seem to tame.
The basic problem is that I'll start the engine and it fires right up and
runs at about 700-750 RPM just like the book says it should. But from
there, all it seems to want to do is gradually idle slower and slower as the
engine warms up until it barely runs (between 450-500 RPM) by the time I've
done all my checks and am ready to take the runway for takeoff.
The engine is a new Mattituck built TMX-IO360 Lycoming clone with Lightspeed
electronic ignition on one side and a magneto on the other. It also has
Airflow Performance fuel injection with purge valve, a Sterba wood prop and
Mark Landoll's 11 pound steel inertia ring bolted to the flywheel. The
configuration is updraft with the AFP fuel controller bolted to the bottom
of the sump (like carbureted engines) and uses Van's airbox. I've read the
AFP manual and talked to the tech there and adjusted the idle mixture and
stop numerous times but I can't seem to stabilize it. When I have the
cowling off, I make the adjustments and taxi around a bit to warm up the
engine and it seems to be ok. Then I'll put the cowling back on and the
symptoms seem to reappear. There isn't anything banging against the cowling
that I can see that would be causing trouble so I'm totally stumped!
Anyone else having this problem? I'm flying out of a long but narrow strip
with trees on three side and no good places to land near the airport.
Needless to say it makes me nervous, even though the engine runs strong just
off idle and at full power. Thanks.
Dean Psiropoulos
RV-6A N197DM
4.1 hours
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Bruce(at)glasair.org
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| Posted: Wed Dec 31, 2008 2:41 pm Post subject: Lousy idle |
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Try it without the air filter.
Bruce
www.Glasair.org
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mrobert569(at)hotmail.com
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| Posted: Wed Dec 31, 2008 2:54 pm Post subject: Lousy idle |
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Dean C
It sounds like you have an intake leak. A reason it gets worse with the cowling on is that there is warmer air inside the cowling. Without the cowling the surrounding air stays the same temp. May I suggest you get a spray water bottle. With the engine running C carefully spray all the intake connections and see what happens. If there is an intake leak the engine should stutter. If that does not work give me a call. I think you still have my cell phone number.
Also C we are flying down to your neck of the woods on january 10th for a week in Orlando at out timeshare. maybe we can get together.
Mike Robertson
| Quote: | Date: Wed C 31 Dec 2008 15:39:06 -0500
From: dean.psiropoulos(at)verizon.net
Subject: Lousy idle
To: rv-list(at)matronics.com
--> RV-List message posted by: "DEAN PSIROPOULOS" <dean.psiropoulos(at)verizon.net>
Anyone have a few words of wisdom for me:
I'm pulling my hair out over a crappy engine idle that I can't seem to tame.
The basic problem is that I'll start the engine and it fires right up and
runs at about 700-750 RPM just like the book says it should. But from
there C all it seems to want to do is gradually idle slower and slower as the
engine warms up until it barely runs (between 450-500 RPM) by the time I've
done all my checks and am ready to take the runway for takeoff.
The engine is a new Mattituck built TMX-IO360 Lycoming clone with Lightspeed
electronic ignition on one side and a magneto on the other. It also has
Airflow Performance fuel injection with purge valve C a Sterba wood prop and
Mark Landoll's 11 pound steel inertia ring bolted to the flywheel. The
configuration is updraft with the AFP fuel controller bolted to the bottom
of the sump (like carbureted engines) and uses Van's airbox. I've read the
AFP manual and talked to the tech there and adjusted the idle mixture and
stop numerous times but I can't seem to stabilize it. When I have the
cowling off C I make the adjustments and taxi around a bit to warm up the
engine and it seems to be ok. Then I'll put the cowling back on and the
symptoms seem to reappear. There isn't anything banging against the cowling
that I can see that would be causing trouble so I'm totally stumped!
Anyone else having this problem? I'm flying out of a long but narrow strip
with trees on three side and no good places to land near the airport.
Needless to say it makes me nervous C even though the engine runs strong just
off idle and at full power. Thanks.
Dean Psiropoulos
RV-6A N197DM
4.1 hours
&========
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Send e-mail faster without improving your typing skills. Get your HotmailŪ account. [quote][b]
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sportav8r(at)gmail.com
Guest
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| Posted: Wed Dec 31, 2008 3:50 pm Post subject: Lousy idle |
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Might be safer to leave the engine off, blow shop vacuum cleaner air into the intake, spray soapy water on the intake plumbing and look for bubbles. I have never done this, but it sounds like it might work, pinpoint the leak more precisely, and there is no prop blast and extreme danger of loss of limb or life involved. We have a one-armed mechanic around here who stumbled into a running engine in the service hangar while setting the mag timing. Be careful.-Stormy
On Dec 31, 2008, at 5:51 PM, Mike Robertson wrote:
| Quote: | Dean,
It sounds like you have an intake leak. A reason it gets worse with the cowling on is that there is warmer air inside the cowling. Without the cowling the surrounding air stays the same temp. May I suggest you get a spray water bottle. With the engine running, carefully spray all the intake connections and see what happens. If there is an intake leak the engine should stutter. If that does not work give me a call. I think you still have my cell phone number.
Also, we are flying down to your neck of the woods on january 10th for a week in Orlando at out timeshare. maybe we can get together.
Mike Robertson
|
[/quote]
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rickpegser(at)yahoo.com
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| Posted: Wed Dec 31, 2008 7:11 pm Post subject: Lousy idle |
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it is time to get the guages out check the unregulated fuel pressure and the regulated fuel pressure, also check the you don't have an internel leak in the servo. but i would still bet it is an intake leak. spray all of the connections with wd-40 and see if you get an increase in rpm.
rick
--- On Wed, 12/31/08, DEAN PSIROPOULOS <dean.psiropoulos(at)verizon.net> wrote:
| Quote: | From: DEAN PSIROPOULOS <dean.psiropoulos(at)verizon.net>
Subject: Lousy idle
To: rv-list(at)matronics.com
Date: Wednesday, December 31, 2008, 12:39 PM
PSIROPOULOS" <dean.psiropoulos(at)verizon.net>
Anyone have a few words of wisdom for me:
I'm pulling my hair out over a crappy engine idle that
I can't seem to tame.
The basic problem is that I'll start the engine and it
fires right up and
runs at about 700-750 RPM just like the book says it
should. But from
there, all it seems to want to do is gradually idle slower
and slower as the
engine warms up until it barely runs (between 450-500 RPM)
by the time I've
done all my checks and am ready to take the runway for
takeoff.
The engine is a new Mattituck built TMX-IO360 Lycoming
clone with Lightspeed
electronic ignition on one side and a magneto on the other.
It also has
Airflow Performance fuel injection with purge valve, a
Sterba wood prop and
Mark Landoll's 11 pound steel inertia ring bolted to
the flywheel. The
configuration is updraft with the AFP fuel controller
bolted to the bottom
of the sump (like carbureted engines) and uses Van's
airbox. I've read the
AFP manual and talked to the tech there and adjusted the
idle mixture and
stop numerous times but I can't seem to stabilize it.
When I have the
cowling off, I make the adjustments and taxi around a bit
to warm up the
engine and it seems to be ok. Then I'll put the
cowling back on and the
symptoms seem to reappear. There isn't anything
banging against the cowling
that I can see that would be causing trouble so I'm
totally stumped!
Anyone else having this problem? I'm flying out of a
long but narrow strip
with trees on three side and no good places to land near
the airport.
Needless to say it makes me nervous, even though the engine
runs strong just
off idle and at full power. Thanks.
Dean Psiropoulos
RV-6A N197DM
4.1 hours
|
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rocketbob(at)gmail.com
Guest
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| Posted: Fri Jan 02, 2009 7:33 am Post subject: Lousy idle |
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Check to make sure all your primer port pipe plugs are tight. Last year I had a Saratoga I worked on with an intake leak, found that a pipe plug was missing on one of the cylinder primer ports.
Regards,
Bob Japundza
RV-6 flying F1 under const.
On Wed, Dec 31, 2008 at 10:09 PM, RICHARD MILLER <rickpegser(at)yahoo.com (rickpegser(at)yahoo.com)> wrote:
[quote] --> RV-List message posted by: RICHARD MILLER <rickpegser(at)yahoo.com (rickpegser(at)yahoo.com)>
it is time to get the guages out check the unregulated fuel pressure and the regulated fuel pressure, also check the you don't have an internel leak in the servo. but i would still bet it is an intake leak. spray all of the connections with wd-40 and see if you get an increase in rpm.
rick
--- On Wed, 12/31/08, DEAN PSIROPOULOS <dean.psiropoulos(at)verizon.net (dean.psiropoulos(at)verizon.net)> wrote:
> From: DEAN PSIROPOULOS <dean.psiropoulos(at)verizon.net (dean.psiropoulos(at)verizon.net)>
> Subject: Lousy idle
> To: rv-list(at)matronics.com (rv-list(at)matronics.com)
| Quote: | Date: Wednesday, December 31, 2008, 12:39 PM
|
>
> Anyone have a few words of wisdom for me:
>
> I'm pulling my hair out over a crappy engine idle that
> I can't seem to tame.
> The basic problem is that I'll start the engine and it
> fires right up and
> runs at about 700-750 RPM just like the book says it
> should. But from
> there, all it seems to want to do is gradually idle slower
> and slower as the
> engine warms up until it barely runs (between 450-500 RPM)
> by the time I've
> done all my checks and am ready to take the runway for
> takeoff.
>
>
> The engine is a new Mattituck built TMX-IO360 Lycoming
> clone with Lightspeed
> electronic ignition on one side and a magneto on the other.
> It also has
> Airflow Performance fuel injection with purge valve, a
> Sterba wood prop and
> Mark Landoll's 11 pound steel inertia ring bolted to
> the flywheel. The
> configuration is updraft with the AFP fuel controller
> bolted to the bottom
> of the sump (like carbureted engines) and uses Van's
> airbox. I've read the
> AFP manual and talked to the tech there and adjusted the
> idle mixture and
> stop numerous times but I can't seem to stabilize it.
> When I have the
> cowling off, I make the adjustments and taxi around a bit
> to warm up the
> engine and it seems to be ok. Then I'll put the
> cowling back on and the
> symptoms seem to reappear. There isn't anything
> banging against the cowling
> that I can see that would be causing trouble so I'm
> totally stumped!
>
> Anyone else having this problem? I'm flying out of a
> long but narrow strip
> with trees on three side and no good places to land near
> the airport.
> Needless to say it makes me nervous, even though the engine
> runs strong just
> off idle and at full power. Thanks.
>
> Dean Psiropoulos
> RV-6A N197DM
> 4.1 hours
>
>
>
>
>
[b]
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recapen(at)earthlink.net
Guest
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| Posted: Fri Jan 02, 2009 8:21 am Post subject: Lousy idle |
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Good thought Bob,
What should be used as a thread sealant?
Getting ready to do some engine idling myself this weekend - knowing the engine can idle where it needs to is a very good thing.....especially, short-final.....next weekend it's refresher training.
Ralph
RV6A N822AR (at) N06 0 flight hrs
--
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rocketbob(at)gmail.com
Guest
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| Posted: Fri Jan 02, 2009 9:02 am Post subject: Lousy idle |
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I use Titeseal medium on pipe threads, and I've never had one leak. I even rub gaskets with it. Never, ever, ever put a gasket on dry. You'll appreciate it when a gasket's been on something for a few years and you don't have to scrape it off to remove it.
Ralph keep your idling to a minimum. The longer you idle the engine before first flight the longer it will take to get your rings seated.
Regards,
Bob Japundza A&P
RV-6 flying F1 under const.
On Fri, Jan 2, 2009 at 11:18 AM, Ralph E. Capen <recapen(at)earthlink.net (recapen(at)earthlink.net)> wrote:
[quote] --> RV-List message posted by: "Ralph E. Capen" <recapen(at)earthlink.net (recapen(at)earthlink.net)>
Good thought Bob,
What should be used as a thread sealant?
Getting ready to do some engine idling myself this weekend - knowing the engine can idle where it needs to is a very good thing.....especially, short-final.....next weekend it's refresher training.
Ralph
RV6A N822AR (at) N06 0 flight hrs
--
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recapen(at)earthlink.net
Guest
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| Posted: Fri Jan 02, 2009 9:14 am Post subject: Lousy idle |
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Thanks - good idea - I just want to know that it will idle at an appropriate RPM - 700 or so.
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pltdbeezer(at)aol.com
Guest
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| Posted: Fri Jan 02, 2009 4:42 pm Post subject: Lousy idle |
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If it only does it with the cowling on could be getting fuel vaporizing in the lines.
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pltdbeezer(at)aol.com
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| Posted: Fri Jan 02, 2009 4:58 pm Post subject: Lousy idle |
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If it only idles bad with the cowling on it could be fuel vaporizing in the lines
--
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pitts_pilot(at)bellsouth.
Guest
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| Posted: Fri Jan 02, 2009 9:25 pm Post subject: Lousy idle |
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I would suspect an intake leak that gets worse as the engine warms up.
Linn
DEAN PSIROPOULOS wrote:
| Quote: |
Anyone have a few words of wisdom for me:
I'm pulling my hair out over a crappy engine idle that I can't seem to tame.
The basic problem is that I'll start the engine and it fires right up and
runs at about 700-750 RPM just like the book says it should. But from
there, all it seems to want to do is gradually idle slower and slower as the
engine warms up until it barely runs (between 450-500 RPM) by the time I've
done all my checks and am ready to take the runway for takeoff.
The engine is a new Mattituck built TMX-IO360 Lycoming clone with Lightspeed
electronic ignition on one side and a magneto on the other. It also has
Airflow Performance fuel injection with purge valve, a Sterba wood prop and
Mark Landoll's 11 pound steel inertia ring bolted to the flywheel. The
configuration is updraft with the AFP fuel controller bolted to the bottom
of the sump (like carbureted engines) and uses Van's airbox. I've read the
AFP manual and talked to the tech there and adjusted the idle mixture and
stop numerous times but I can't seem to stabilize it. When I have the
cowling off, I make the adjustments and taxi around a bit to warm up the
engine and it seems to be ok. Then I'll put the cowling back on and the
symptoms seem to reappear. There isn't anything banging against the cowling
that I can see that would be causing trouble so I'm totally stumped!
Anyone else having this problem? I'm flying out of a long but narrow strip
with trees on three side and no good places to land near the airport.
Needless to say it makes me nervous, even though the engine runs strong just
off idle and at full power. Thanks.
Dean Psiropoulos
RV-6A N197DM
4.1 hours
|
| | - The Matronics RV-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?RV-List |
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mrobert569(at)hotmail.com
Guest
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| Posted: Sat Jan 03, 2009 6:25 pm Post subject: Lousy idle |
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I Like it! Much better idea!!
Mike R.
To: rv-list(at)matronics.com
Subject: Re: Lousy idle
Date: Wed C 31 Dec 2008 18:48:25 -0500
From: sportav8r(at)gmail.com
Might be safer to leave the engine off C blow shop vacuum cleaner air into the intake C spray soapy water on the intake plumbing and look for bubbles. I have never done this C but it sounds like it might work C pinpoint the leak more precisely C and there is no prop blast and extreme danger of loss of limb or life involved. We have a one-armed mechanic around here who stumbled into a running engine in the service hangar while setting the mag timing. Be careful.
-Stormy
On Dec 31 C 2008 C at 5:51 PM C Mike Robertson wrote:
| Quote: | Dean C
It sounds like you have an intake leak. A reason it gets worse with the cowling on is that there is warmer air inside the cowling. Without the cowling the surrounding air stays the same temp. May I suggest you get a spray water bottle. With the engine running C carefully spray all the intake connections and see what happens. If there is an intake leak the engine should stutter. If that does not work give me a call. I think you still have my cell phone number.
Also C we are flying down to your neck of the woods on january 10th for a week in Orlando at out timeshare. maybe we can get together.
Mike Robertson
| Quote: | Date: Wed C 31 Dec 2008 15:39:06 -0500
From: dean.psiropoulos(at)verizon.net (dean.psiropoulos(at)verizon.net)
Subject: Lousy idle
To: rv-list(at)matronics.com (rv-list(at)matronics.com)
--> RV-List message posted by: "DEAN PSIROPOULOS" <dean.psiropoulos(at)verizon.net (dean.psiropoulos(at)verizon.net)>
Anyone have a few words of wisdom for me:
I'm pulling my hair out over a crappy engine idle that I can't seem to tame.
The basic problem is that I'll start the engine and it fires right up and
runs at about 700-750 RPM just like the book says it should. But from
there C all it seems to want to do is gradually idle slower and slower as the
engine warms up until it barely runs (between 450-500 RPM) by the time I've
done all my checks and am ready to take the runway for takeoff.
The engine is a new Mattituck built TMX-IO360 Lycoming clone with Lightspeed
electronic ignition on one side and a magneto on the other. It also has
Airflow Performance fuel injection with purge valve C a Sterba wood prop and
Mark Landoll's 11 pound steel inertia ring bolted to the flywheel. The
configuration is updraft with the AFP fuel controller bolted to the bottom
of the sump (like carbureted engines) and uses Van's airbox. I've read the
AFP manual and talked to the tech there and adjusted the idle mixture and
stop numerous times but I can't seem to stabilize it. When I have the
cowling off C I make the adjustments and taxi around a bit to warm up the
engine and it seems to be ok. Then I'll put the cowling back on and the
symptoms seem to reappear. There isn't anything banging against the cowling
that I can see that would be causing trouble so I'm totally stumped!
Anyone else having this problem? I'm flying out of a long but narrow strip
with trees on three side and no good places to land near the airport.
Needless to say it makes me nervous C even though the engine runs strong just
off idle and at full power. Thanks.
Dean Psiropoulos
RV-6A N197DM
4.1 hours
&========
|
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