Today's Message Index:
----------------------
1. 12:58 AM - Re: 912 One cylinder running rich (K Dilks)
2. 04:34 AM - Re: 912 One cylinder running rich (Thom Riddle)
3. 08:28 AM - Fuel Line Growing (Jim Feldmann)
4. 09:01 AM - Re: Fuel Line Growing (lucien)
5. 09:52 AM - Re: Fuel Line Growing (Joe Ronco)
Message 1
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| Subject: | Re: 912 One cylinder running rich |
If No1 cyl really runs rich at idle it can be the idle jet is getting blocked.
I know this sounds wrong but bear with me.
As Roger says the inlet manifold distributes the fuel not so well at low speeds
but if the idle jet gets blocked cyl 1 runs rich from fuel being pulled by the
high vacuum through the main jet, but this does not atomize well and goes to
number 1 at idle.
When fully block it will flood No1 and run on 3 cylinders.
When the engine speeds up to about 2200 rpm the situation is reversed and cyl
3 get the rich mix.
Blow out the small idle jet and check idle mixture screw is no more that 1 1/2
turns open.
Hope this is clear
Kev
--------
Austria .............
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http://forums.matronics.com/viewtopic.php?p=243504#243504
Message 2
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| Subject: | Re: 912 One cylinder running rich |
Pete,
In addition to what others have said about unequal air/fuel distribution at low
engine speed, there is one other possibility. This occurred on a 912UL in an
Allegro 2000. It turned out to be a partially broken light gage wire in the ignition
circuit. I can't tell you which wire it was but the insulation was white
in color and it was very light gage, probably #18 or #20.
Before we found the partially broken wire and repaired it, the plugs in #1 cylinder
were always very sooty. There was no differential compression problem and
no perceptible loss of power. After the repair, the front cylinder plugs were
still darker than the rear cylinder plugs but not like before the repair.
So if all else fails to cure the sooty front plugs, do an thorough examination
of every inch of your ignition system wiring. You may find a partial break as
I did.
--------
Thom Riddle
Buffalo, NY
http://riddletr.googlepages.com/sportpilot-cfi
http://riddletr.googlepages.com/a%26pmechanix
A complex system that works is invariably found to have evolved from a simple system
that works.
- John Gaule
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Message 3
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| Subject: | Fuel Line Growing |
I just replaced all of the flexible fuel lines (wing tanks to header and firewall
forward) with new Goodyear SAE 30R7 rubber fuel line. After a day or two I
noticed that the lines seemed to have gotten longer, so I did a test.
Immersing a 3" long piece of fuel line in fuel for 48 hours caused it to grow to
3 1/8" long. I put a piece of Gates SAE 30R7 in with it, and it grew by exactly
the same amount. Fortunately, the ID increased as well, so I am not immediately
concerned that it will restrict the fuel flow, but clearly, the fuel is
infiltrating the rubber.
The fuel I'm running right now is 50% 100LL, 50% 91 octane autogas and the appropriate
amount of Decalin. There is no measurable ethanol in the mix.
It's been warm here, so I did a control test to see if temperature would cause
expansion and contraction. I put a second 3" sample of each brand in the refrigerator
for 48 hours. No change in the length of either one.
Has anyone experienced this.
--------
Jim Feldmann, 3rd owner
1994 Kitfox IV Speedster / 912
Working on my Sport Pilot Certificate
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http://forums.matronics.com/viewtopic.php?p=243542#243542
Message 4
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| Subject: | Re: Fuel Line Growing |
Jim Feldmann wrote:
> I just replaced all of the flexible fuel lines (wing tanks to header and firewall
forward) with new Goodyear SAE 30R7 rubber fuel line. After a day or two
I noticed that the lines seemed to have gotten longer, so I did a test.
>
> Immersing a 3" long piece of fuel line in fuel for 48 hours caused it to grow
to 3 1/8" long. I put a piece of Gates SAE 30R7 in with it, and it grew by exactly
the same amount. Fortunately, the ID increased as well, so I am not immediately
concerned that it will restrict the fuel flow, but clearly, the fuel is
infiltrating the rubber.
>
> The fuel I'm running right now is 50% 100LL, 50% 91 octane autogas and the appropriate
amount of Decalin. There is no measurable ethanol in the mix.
>
> It's been warm here, so I did a control test to see if temperature would cause
expansion and contraction. I put a second 3" sample of each brand in the refrigerator
for 48 hours. No change in the length of either one.
>
> Has anyone experienced this.
The last time I used the black rubber automotive line was years ago, so don't know
if it did this. I'd certainly be very concerned tho - this doesn't sound like
something I'd want to happen in an airplane fuel system......
The main problem with the black rubber line, besides the fact that it can't be
inspected, is it's pleated - the pleats can separate under vacuum and the inner
wall can collapse with disastrous results. Don't ask my why I know this.
The only opaque stuff I'd run would probably be Aeroquip and I'd use that in places
where replacing it regularly is very difficult or impossible.
I now use Tygothane fuel line which is designed for applications under vacuum like
ours generally are. And it doesn't require special fittings like aeroquip
does.
LS
--------
LS
Titan II SS
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http://forums.matronics.com/viewtopic.php?p=243549#243549
Message 5
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| Subject: | Fuel Line Growing |
JIM: Goodyear says for SAE30R9 "WARNING: Do not immerse in gasoline". Both
30R7 and 30R9 have the same outer cover (Black Hypalon-see attached Spec
Sheets) so maybe the same warning applies to both? Just a guess. You could
also contact Goodyear by phone or e-mail and ask about it. See:
http://www.goodyearep.com/contactus.aspx
Let us know what they say if you do.
Joe R
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Jim
Feldmann
Sent: Monday, May 11, 2009 9:27 AM
Subject: RotaxEngines-List: Fuel Line Growing
<feldesign@earthlink.net>
I just replaced all of the flexible fuel lines (wing tanks to header and
firewall forward) with new Goodyear SAE 30R7 rubber fuel line. After a day
or two I noticed that the lines seemed to have gotten longer, so I did a
test.
Immersing a 3" long piece of fuel line in fuel for 48 hours caused it to
grow to 3 1/8" long. I put a piece of Gates SAE 30R7 in with it, and it grew
by exactly the same amount. Fortunately, the ID increased as well, so I am
not immediately concerned that it will restrict the fuel flow, but clearly,
the fuel is infiltrating the rubber.
The fuel I'm running right now is 50% 100LL, 50% 91 octane autogas and the
appropriate amount of Decalin. There is no measurable ethanol in the mix.
It's been warm here, so I did a control test to see if temperature would
cause expansion and contraction. I put a second 3" sample of each brand in
the refrigerator for 48 hours. No change in the length of either one.
Has anyone experienced this.
--------
Jim Feldmann, 3rd owner
1994 Kitfox IV Speedster / 912
Working on my Sport Pilot Certificate
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=243542#243542
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