Today's Message Index:
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1. 02:32 AM - Re: Slight ringing at low RPM when taxiing (selwyn)
2. 12:50 PM - Re: uneven EGT's (Bill Strahan)
3. 12:53 PM - Re: Slight ringing at low RPM when taxiing (Bill Strahan)
4. 04:32 PM - Re: Re: uneven EGT's (Tex Mantell)
5. 06:53 PM - Re: Slight ringing at low RPM when taxiing (Allan Maxwell)
6. 07:22 PM - Re: uneven EGT's (Allan Maxwell)
Message 1
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| Subject: | Re: Slight ringing at low RPM when taxiing |
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.
--------
Cheers, Selwyn
Kit 66
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| Subject: | Re: uneven EGT's |
Is this at full throttle? Mine is excellent once throttled back quite a bit, all
within about 30 degrees of each other, which I consider about as good as you
can get with a carb.
It's only at the upper end of the throttle setting, full throttle in particular
that mine get incredibly uneven.
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http://forums.matronics.com/viewtopic.php?p=273759#273759
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| Subject: | Re: Slight ringing at low RPM when taxiing |
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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| Subject: | Re: uneven EGT's |
I have been playing arround with different jets and needle jets and have
come back to the original jets that were in the engine to start. At full
throtle take off and climb they are in the 1150 to 1250 region and not very
close to each other. At cruse arround 2450 to 3000 rpm they are all arround
1275 to 1325. I have a 250 main jet and a 290 needle jet. I only have 28
hrs on the plane and mabe its getting broken in. I will stay at this set up
till I get a few more hours on it. Tex
----- Original Message -----
From: "Bill Strahan" <bill@gdsx.com>
Sent: Thursday, November 19, 2009 3:48 PM
Subject: Lightning-List: Re: uneven EGT's
>
> Is this at full throttle? Mine is excellent once throttled back quite a
> bit, all within about 30 degrees of each other, which I consider about as
> good as you can get with a carb.
>
> It's only at the upper end of the throttle setting, full throttle in
> particular that mine get incredibly uneven.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=273759#273759
>
>
>
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| Subject: | Re: Slight ringing at low RPM when taxiing |
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@aol.com <N1BZRich@aol.com> wrote:
From: N1BZRich@aol.com <N1BZRich@aol.com>
Subject: Re: Lightning-List: Slight ringing at low RPM when taxiing
Bill,
----Unless you have the "door bell" mod, I suspect you have somethi
ng vibrating.- Check anywhere you have air movement under the cowling for
something loose that could vibrate.- That is assuming the sound is comin
g 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 airplan
es 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.- Ha
ve 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 d
istribution.-
----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 whil
e I was out there in October and they seemed to be open to Ben trying one o
ut 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 don
e.- 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@gdsx
.com writes:
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 f
rom idle to sufficient RPM to start to taxi.
It is very brief, and very quiet, but it's there.- Just the tiniest ringi
ng 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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http://forums.matronics.com/viewtopic.php?p=273559#273559=====
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Message 6
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| Subject: | Re: uneven EGT's |
Linda I have been working on my egt's I have an esqual. This is the first d
ay to fly since changes. My egt's are much better in cruise up to 3000. The
fix was to replace the O rings in the manifold. I will take the gasket sea
ler 2b tomorrow to seal the cracks and around the intake tubes. My plane ha
s 302 hrs flying now hope the info will help will let you know the results.
Allan Maxwell
--- On Wed, 11/18/09, JOSEPH MATHIAS LINDA MATHIAS <lbmathias@verizon.net>
wrote:
From: JOSEPH MATHIAS LINDA MATHIAS <lbmathias@verizon.net>
Subject: Re: Lightning-List: uneven EGT's
Tex,
--- You were lucky; rotating the carb made very little difference on
my EGTs.
-
Linda
----- Original Message -----
From: Tex Mantell
Sent: Wednesday, November 18, 2009 6:48 PM
Subject: Lightning-List: uneven EGT's
Nick, I also had a uneven egt on number one (1) . I rotated the carb about
three degrees and problem gone. I use the normal scat tub between the air b
ox and carb. All EGT's are now within 45 degrees.-- Tex
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