Today's Message Index:
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0. 12:22 AM - Just A Few More Days To Make Your List Contribution... (Matt Dralle)
1. 05:24 AM - Re: Rough running cured with carb heater (Thom Riddle)
2. 05:46 AM - Re: Rough running cured with carb heater (Catz631@aol.com)
3. 06:06 AM - Re: Rough running cured with carb heater (Thom Riddle)
4. 07:17 AM - Re: I can't burp the oil tank on my 912 UL. Could use some help (moosepileit)
5. 09:37 AM - Re: Re: Rough running cured with carb heater (Dave Austin)
6. 10:00 AM - Re: Rough running cured with carb heater (Roger Lee)
7. 10:09 AM - Re: Re: Rough running cured with carb heater (Richard Girard)
8. 10:32 AM - Re: Re: Rough running cured with carb heater (=?ISO-8859-1?Q?J=F3hann_J=F3hannsson?=)
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| Subject: | Just A Few More Days To Make Your List Contribution... |
There is less than a week left in this year's List Fund Raiser and only a few short
days to grab one of the great Contribution Gifts available this year. Support
is still significantly lagging behind last year at this point but hopefully
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Thank you!
Matt Dralle
Matronics EMail List and Forum Administrator
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| Subject: | Re: Rough running cured with carb heater |
Johann,
If you find that your carburetors work fine on his engine, then it is time for
you to take his carburetors apart for a thorough cleaning and inspection. You
don't have to be a certified mechanic to do this, just be able to follow instructions
well and carefully, and take your time. You can buy the Bing Carburetor
manual for $11 in the US or maybe better to buy it from the factory, since you
are in Iceland. It goes in to all the detail you need to dis-assemble, clean
and inspect the carburetors.
I have found that aircraft that have been through multiple owners have sometimes
had unqualified mechanics "fixing" carb problems that they did not really understand,
by changing jets that should not have been changed. I've even seen this
in Type Certificated aircraft with Certified Rotax 912 engines. Once you are
certain that all the jets, needles, and seals are correct and in good condition
and the adjustments are according to the Rotax recommendations, and the carbs
balanced/synchronized properly, your problems will likely disappear.
Trust the manufacturer to know his engine better than anyone else, and follow their
advice.
Thom Riddle
Buffalo, NY
USA
http://sites.google.com/site/riddletr/a&pmechanix
--------
Thom Riddle
Buffalo, NY (9G0)
Kolb Slingshot SS-021
Jabiru 2200A #1574
Tennessee Prop 64x32
Everyone is entitled to his own opinion, but not his own facts.
Daniel Patrick Moynihan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=320787#320787
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| Subject: | Re: Rough running cured with carb heater |
Johann,
Applying carb heat in most aircraft leans the mixture . Perhaps you are
running on the rich side now and by applying carb heat you lean the mixture
and the engine runs better ?
Or as Roger says,"not enough air with more throttle" ?
I haven't followed your listing too closely so have probably missed
something. I doubt adjusting the needles would make that much difference but you
could try going to a leaner position & see if that helps.
My 2 cents
Dick Maddux
912UL
Milton,Fl
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| Subject: | Re: Rough running cured with carb heater |
Dick,
...Applying carb heat in most aircraft leans the mixture ...
I regret to inform you that you are mistaken. The warmer less dense air from applying
carb heat, combined with the same amount of fuel, results in a richer mixture,
not leaner. This is why as you climb higher into less dense air you must
lean the mixture to maintain proper combustion.
--------
Thom Riddle
Buffalo, NY (9G0)
Kolb Slingshot SS-021
Jabiru 2200A #1574
Tennessee Prop 64x32
Everyone is entitled to his own opinion, but not his own facts.
Daniel Patrick Moynihan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=320792#320792
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| Subject: | Re: I can't burp the oil tank on my 912 UL. Could use |
some help
Once you are happy with the connections, don't forget that you are also probably
near the stage where you want to do a purge per the service instruction. SI-912-018
This will include removing the valve covers, taking each piston to TDC and then
checking each lifter for air by pressing 15# of pressure for 3 seconds on each
pushrod. You then use a feeler gauge (.020/.5mm) to make sure there is no gap
in excess of this under the valve springs at the top of the valves.
The rotax owners site has videos on this and I assume it's in the Lockwood 912
DVD also. Failing to do it will overload your valve spring retainers if not damage
a running engine in general.
I made my own kit, though they are sold at Lockwood, CPS and LEAF.
You connect the oil vent line to 6-15 PSI, 15 is the max. Air will leak at the
oil tank cap seal, but it's in the service instruction that it is normal. you
put a plug on the return fitting to the tank, the one that you disconnected
the oil return line from- I just used some short tubing lengths w/ AN plugs clamped
in.
The Suction line to the oil cooler that then goes to the oil pump from the tank
stays connected. The return line to the tank from the banjo is put low in a
catch- you have good oil that you want to save, use a clean catch. You remove
the spark plug leads, all 8, and remove the top spark plugs. Clockwise rotation
of the prop by hand or with starter in 10 second bursts (then cooling) with
good oil pressure indicated. Don't let the supply oil tank empty below the
suction pickup tube or you introduce air and have to start over again after topping
off the oil. I did it by hand and it worked just fine to get oil pressure
up.
Reconnect the return line, disconnect the connection to the tank vent.
My pressure fitting from my air compressor w/ a 6 gal tank was a barb connection
threaded into an air tank quick disconnect.
You are removing air from the system and making sure your lifters have no air in
them.
There are some good threads on this here. This is also a good time to remind you
that normal aircraft mechanics may not understand the engine at all. Unlike
a Lyc or Cont engine, the case is supposed to pressurize to remove the need
for a suction return pump. This is what you are doing when you burp the tank
normally in preflight.
When you break the lines or are just starting out, you need to do the purge to
remove air, then check your lifters per the SI.
http://forum.matronics.com/viewtopic.php?p=170780&sid=94250a8a2fb91b49bf1b932ea12247ae
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=320809#320809
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| Subject: | Re: Rough running cured with carb heater |
Thom,
If the air is hotter and less dense, will it not raise the needle as far, and thus
lean the mixture?
That would also apply as you fly higher.
Dave Austin
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| Subject: | Re: Rough running cured with carb heater |
Hi Dave,
Warm air will richen the mixture and cold air will leans it.
I have seen guys try and tweak their engine temps too close to the max trying to
get more HP when the weather is warm. Then they go out on a cold morning and
seize their engine and don't understand why. They think the colder air should
have kept the engine cooler, but the cold air affects the fuel mixture and it
seizes.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
Home 520-574-1080 TRY HOME FIRST
Cell 520349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=320838#320838
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| Subject: | Re: Rough running cured with carb heater |
Dave, you have raising the needle confused with raising the clip. Raising
the needle richens the mixture and is done by lowering the clip, Lowering
the needle leans the mixture and is done by raising the clip.
Rick Girard
On Wed, Nov 24, 2010 at 11:23 AM, Dave Austin <daveaustin2@primus.ca> wrote:
> daveaustin2@primus.ca>
>
> Thom,
> If the air is hotter and less dense, will it not raise the needle as far,
> and thus lean the mixture? That would also apply as you fly higher.
> Dave Austin
>
>
--
Zulu Delta
Kolb Mk IIIC
582 Gray head
4.00 C gearbox
3 blade WD
Thanks, Homer GBYM
It is not bigotry to be certain we are right; but it is bigotry to be unable
to imagine how we might possibly have gone wrong.
- G.K. Chesterton
Message 8
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| Subject: | Re: Rough running cured with carb heater |
Hi all.
This is what we thought also and therefore raised the needle and the
clip is in the bottom position. Still did not fix the problem.
Good to know we were on the right track.
Thanks,
Johann G.
On 24.11.2010, at 18:07, Richard Girard wrote:
> Dave, you have raising the needle confused with raising the clip.
> Raising the needle richens the mixture and is done by lowering the
> clip, Lowering the needle leans the mixture and is done by raising
> the clip.
>
> Rick Girard
>
> On Wed, Nov 24, 2010 at 11:23 AM, Dave Austin
> <daveaustin2@primus.ca> wrote:
> >
>
> Thom,
> If the air is hotter and less dense, will it not raise the needle as
> far, and thus lean the mixture? That would also apply as you fly
> higher.
> Dave Austin
>
>
> ==========
> om" target="_blank">www.aeroelectric.com
> ooks.com" target="_blank">www.buildersbooks.com
> et="_blank">www.homebuilthelp.com
> ="_blank">http://www.matronics.com/contribution
> le, List Admin.
> ==========
> -List" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List
> ==========
> http://forums.matronics.com
> ==========
>
>
> --
> Zulu Delta
> Kolb Mk IIIC
> 582 Gray head
> 4.00 C gearbox
> 3 blade WD
> Thanks, Homer GBYM
>
> It is not bigotry to be certain we are right; but it is bigotry to
> be unable to imagine how we might possibly have gone wrong.
> - G.K. Chesterton
>
>
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