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Bill Strahan
Joined: 20 Aug 2008
Posts: 145
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 Posted: Wed Nov 18, 2009 10:18 am Post subject: Slight ringing at low RPM when taxiing |
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I hear the very slightest ringing sound when taxiing. It does not occur at idle RPM, and can only be heard for a brief moment as the RPMs come up from idle to sufficient RPM to start to taxi.
It is very brief, and very quiet, but it's there. Just the tiniest ringing sound. And it seems to change in frequency with the engine during the short time it can be heard.
I don't hear anything of the sort on takeoff or in flight.
Any ideas?
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N1BZRich(at)AOL.COM
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| Posted: Wed Nov 18, 2009 8:53 pm Post subject: Slight ringing at low RPM when taxiing |
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Bill,
Unless you have the "door bell" mod, I suspect you have something vibrating. Check anywhere you have air movement under the cowling for something loose that could vibrate. That is assuming the sound is coming from under the cowl. Maybe the first question should be where does it sound like it is coming from.
As to your Bing carb issue, the fixes you have tried (smooth radiator hose and slightly rotating the carb) has fixed the other airplanes I have heard having the uneven EGT issues (Lightnings and Zodiacs) so I am thinking it is something specific to your carb or intake manifold. Have you checked to make sure you don't have some sort of induction leak? It wouldn't take much of an air leak to cause some major issues with fuel distribution.
But if you do try the Rotec TBI, we do need a future article in the newsletter like Nick mentioned. Several folks have tried them with the Jabiru engine, but I am not aware of any on 3300s and certainly none on a Lightning yet. I talked to Nick, Pete, and Ben about testing one while I was out there in October and they seemed to be open to Ben trying one out when he found the time. I am guessing he has not found any free time recently. So it would be good to hear your results when you get that done. Since the TBI had a mixture, you could pull off your HACman and "give" it to me. What a great idea.
Blue Skies,
Buz
In a message dated 11/18/2009 1:19:31 P.M. Eastern Standard Time, bill(at)gdsx.com writes:
| Quote: | --> Lightning-List message posted by: "Bill Strahan" <bill(at)gdsx.com>
I hear the very slightest ringing sound when taxiing. It does not occur at idle RPM, and can only be heard for a brief moment as the RPMs come up from idle to sufficient RPM to start to taxi.
It is very brief, and very quiet, but it's there. Just the tiniest ringing sound. And it seems to change in frequency with the engine during the short time it can be heard.
I don't hear anything of the sort on takeoff or in flight.
Any ideas?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=273559#273559===============================================
_nbsp; (And Get Some AWESOME FREE to find Gifts tric re b k you for p; -Matt Dralle, List ======================== Use the ties Day ================================================ - MATRONICS WEB FORUMS ==================================================
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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: Wed Nov 18, 2009 10:16 pm Post subject: Slight ringing at low RPM when taxiing |
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The exhaust springs can resonate and will actually snap, I always put a
loop of locking wire through them, partly to stop them dropping on
anyone's head if they snap and partly to stop the vibration that makes
them snap. Might be a singing spring?
Regards, Clive
--
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selwyn
Joined: 12 Mar 2008
Posts: 102
Location: Australia
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| Posted: Thu Nov 19, 2009 2:32 am Post subject: Re: Slight ringing at low RPM when taxiing |
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Another cure for the vibrating exhaust springs is to run a bead of high temperature sealant along the spring, damps out the vibration and, so far, seems to stop them self destructing.
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_________________
Cheers, Selwyn
Kit 66 VH-ELZ |
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Bill Strahan
Joined: 20 Aug 2008
Posts: 145
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| Posted: Thu Nov 19, 2009 12:52 pm Post subject: Re: Slight ringing at low RPM when taxiing |
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I gave the engine a thorough going over last time I had the cowl off, which lately has been almost every day I fly. I'm trying different things with the carb, then going to fly. I may be the first to wear out my cowling nutplates... I'll check all the things mentioned and in particular the springs on the exhaust. That almost seems the most likely since it sounds like it's coming from somewhat low on the engine.
Buz, if the Rotec works to my satisfaction the Hacman is yours. See, it never does hurt to ask.
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allanmaxe(at)yahoo.com
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| Posted: Thu Nov 19, 2009 6:53 pm Post subject: Slight ringing at low RPM when taxiing |
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Hi Buzz this is Allan Maxwell asking if you got the other email I sent let me know.AllanMaxwell
--- On Wed, 11/18/09, N1BZRich(at)aol.com <N1BZRich(at)aol.com> wrote:
| Quote: |
From: N1BZRich(at)aol.com <N1BZRich(at)aol.com>
Subject: Re: Slight ringing at low RPM when taxiing
To: lightning-list(at)matronics.com
Date: Wednesday, November 18, 2009, 10:48 PM
Bill,
Unless you have the "door bell" mod, I suspect you have something vibrating. Check anywhere you have air movement under the cowling for something loose that could vibrate. That is assuming the sound is coming from under the cowl. Maybe the first question should be where does it sound like it is coming from.
As to your Bing carb issue, the fixes you have tried (smooth radiator hose and slightly rotating the carb) has fixed the other airplanes I have heard having the uneven EGT issues (Lightnings and Zodiacs) so I am thinking it is something specific to your carb or intake manifold. Have you checked to make sure you don't have some sort of induction leak? It wouldn't take much of an air leak to cause some major issues with fuel distribution.
But if you do try the Rotec TBI, we do need a future article in the newsletter like Nick mentioned. Several folks have tried them with the Jabiru engine, but I am not aware of any on 3300s and certainly none on a Lightning yet. I talked to Nick, Pete, and Ben about testing one while I was out there in October and they seemed to be open to Ben trying one out when he found the time. I am guessing he has not found any free time recently. So it would be good to hear your results when you get that done. Since the TBI had a mixture, you could pull off your HACman and "give" it to me. What a great idea.
Blue Skies,
Buz
In a message dated 11/18/2009 1:19:31 P.M. Eastern Standard Time, bill(at)gdsx.com writes:
| Quote: | --> Lightning-List message posted by: "Bill Strahan" <bill(at)gdsx.com>
I hear the very slightest ringing sound when taxiing. It does not occur at idle RPM, and can only be heard for a brief moment as the RPMs come up from idle to sufficient RPM to start to taxi.
It is very brief, and very quiet, but it's there. Just the tiniest ringing sound. And it seems to change in frequency with the engine during the short time it can be heard.
I don't hear anything of the sort on takeoff or in flight.
Any ideas?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=273559#273559======================
_nbsp; (And Get Some AWESOME FREE to find Gifts tric re b k you for p; -Matt Dralle, List ======================== Use the ties Day ======================= - MATRONICS WEB FORUMS =========================
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