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Poor idle on I0-540

 
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Ted French



Joined: 09 Jan 2006
Posts: 54
Location: Kelowna BC Canada
PostPosted: Thu Apr 26, 2007 5:50 pm    Post subject: Poor idle on I0-540 Reply with quote
My I0-540 does not like to run at idle. Anything below about 800 RPM runs
the risk of the engine stopping, which it has done a few times when taxiing
or on run-up

It is equipped with a Lasar ignition with the warning light to tell you if
it is running on the mags alone. Temps seem OK and it runs well once the
power is put to it.

The idle screw is in as far as it will go.

The engine feels a bit rough when slowed down to 800 RPM or so

Anyone have any ideas.?

Ted French C-FXCS
RV-10 Flying

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Ted French
RV-10 fuselage
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jhstarn(at)verizon.net
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PostPosted: Thu Apr 26, 2007 6:46 pm    Post subject: Poor idle on I0-540 Reply with quote
We had simular problems with the IO-540 in the HRII at first. (six years ago), we could not get the idle to "set" either way. Took the whole unit to a repair shop here in So.Calif. Whenever a major update is required they add a dash (-) number. We took it in as a -4 and got it back as as a -11. Made ALL differance in the world, no dying on taxi, no surge in flight, no fast idle & the idle adjustment worked as it should. Our 540 came with the FI unit from a ground looped Skybolt. Worth every penny, it was quite a few, invested. KABONG Do Not Archive HRII N561FS
Quote:
From: Ted French <ted_french(at)telus.net>
Date: 2007/04/26 Thu PM 08:47:55 CDT
To: rv10-list(at)matronics.com
Subject: Poor idle on I0-540

Quote:

My I0-540 does not like to run at idle. Anything below about 800 RPM runs
the risk of the engine stopping, which it has done a few times when taxiing
or on run-up

It is equipped with a Lasar ignition with the warning light to tell you if
it is running on the mags alone. Temps seem OK and it runs well once the
power is put to it.

The idle screw is in as far as it will go.

The engine feels a bit rough when slowed down to 800 RPM or so

Anyone have any ideas.?

Ted French C-FXCS
RV-10 Flying


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billderou(at)yahoo.com
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PostPosted: Thu Apr 26, 2007 7:15 pm    Post subject: Poor idle on I0-540 Reply with quote
My initial thought is an air leak. Suggest you remove the cowl, and purchase brake cleaner from an auto store in a spray can. It will noticeably drop the rpm if the liquid gets into the intake air flow. Using the thin straw slowly squirt around each intake fitting, particularly the injector to manifold joint. If you can make the rpm drop that is where the leak is located.

Oh yes - and do stay away from the prop.

Bill DeRouchey
N939SB, flying
do not archive


jhstarn(at)verizon.net wrote:
[quote]--> RV10-List message posted by:

We had simular problems with the IO-540 in the HRII at first. (six years ago), we could not get the idle to "set" either way. Took the whole unit to a repair shop here in So.Calif. Whenever a major update is required they add a dash (-) number. We took it in as a -4 and got it back as as a -11. Made ALL differance in the world, no dying on taxi, no surge in flight, no fast idle & the idle adjustment worked as it should. Our 540 came with the FI unit from a ground looped Skybolt. Worth every penny, it was quite a few, invested. KABONG Do Not Archive HRII N561FS
Quote:
From: Ted French
Date: 2007/04/26 Thu PM 08:47:55 CDT
To: rv10-list(at)matronics.com
Subject: Poor idle on I0-540

[quote]--> RV10-List message posted by: "Ted French"
My I0-540 does not like to run at idle. Anything below about 800 RPM runs
the risk of the engine stopping, which it has done a few times when taxiing
or on run-up

It is equipped with a Lasar ignition with the warning light to tell you if
it is running on the mags alone. Temps seem OK and it [quote][b]

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pitts_pilot(at)bellsouth.
Guest
PostPosted: Thu Apr 26, 2007 7:38 pm    Post subject: Poor idle on I0-540 Reply with quote
Great mechanics trick for your car, but not the safest on your airplane.

You can find intake leaks quickly (and safely) if you get a shop-vac that you can hook the hose to the outlet on .... so it blows. Clean it real good and stick the hose in the intake and seal with rags. Turn on the shop-vac and spray soapy water all over the intake. Look for the bubbles.

You can also find some oil leaks by pressurizing the crankcase through the crankcase vent. Spray soapy water everywhere .... oil doesn't seem to stay near the leak for very long!!! I found a pinhole in a pushrod tube this way ..... and the leak eluded the owner for over a year.
Linn ..... be safe out there!

Bill DeRouchey wrote:
[quote] My initial thought is an air leak. Suggest you remove the cowl, and purchase brake cleaner from an auto store in a spray can. It will noticeably drop the rpm if the liquid gets into the intake air flow. Using the thin straw slowly squirt around each intake fitting, particularly the injector to manifold joint. If you can make the rpm drop that is where the leak is located.

Oh yes - and do stay away from the prop.

Bill DeRouchey
N939SB, flying
do not archive


jhstarn(at)verizon.net (jhstarn(at)verizon.net) wrote:
Quote:
--> RV10-List message posted by:

We had simular problems with the IO-540 in the HRII at first. (six years ago), we could not get the idle to "set" either way. Took the whole unit to a repair shop here in So.Calif. Whenever a major update is required they add a dash (-) number. We took it in as a -4 and got it back as as a -11. Made ALL differance in the world, no dying on taxi, no surge in flight, no fast idle & the idle adjustment worked as it should. Our 540 came with the FI unit from a ground looped Skybolt. Worth every penny, it was quite a few, invested. KABONG Do Not Archive HRII N561FS


>From: Ted French
>Date: 2007/04/26 Thu PM 08:47:55 CDT
>To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
>Subject: Poor idle on I0-540

>--> RV10-List message posted by: "Ted French"
>
>
>My I0-540 does not like to run at idle. Anything below about 800 RPM runs
>the risk of the engine stopping, which it has done a few times when taxiing
>or on run-up
>
>It is equipped with a Lasar ignition with the warning light to tell you if
>it is running on the mags alone. Temps seem OK and it
Quote:

[b]

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jesse(at)saintaviation.co
Guest
PostPosted: Fri Apr 27, 2007 6:10 am    Post subject: Poor idle on I0-540 Reply with quote
The thing that comes to mind is a problem we just fixed on N416EC. The idle
mixture was set WAY to rich. Check and see if the RPM comes up and it
smoothens out if you spin the mixture cable out. If so, lean out the idle
mixture on the fuel servo and you should be good to go.

Jesse Saint
Saint Aviation, Inc.
jesse(at)saintaviation.com
www.saintaviation.com
Cell: 352-427-0285
Fax: 815-377-3694

--

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