Today's Message Index:
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1. 05:23 AM - 912 model IV engine idle (PMorel)
2. 06:53 AM - Re: 912 model IV engine idle (Lowell Fitt)
3. 06:55 AM - Re: 912 model IV engine idle (Frank Goggio)
4. 07:07 AM - Re: 912 model IV engine idle (Roger Lee)
5. 07:59 AM - Re: 912 model IV engine idle (sdemeyer)
6. 08:24 PM - Rotax oil tank (BruceE7837@aol.com)
Message 1
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| Subject: | 912 model IV engine idle |
Has anyone else experienced this problem. I'm unable to sustain an engine idle
below 2200 rpm without the carburetors overloading and flooding out. I suspect
the angle of the engine due to the tailwheel configuration and the float level
of the fuel in the carburetor bowl. My carbs are in sync with each other and
would like to get the idle down. Also, what would be an ideal idle speed for a
912?
Paul Morel
912 Speedster
Locust Grove, GA
Message 2
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| Subject: | Re: 912 model IV engine idle |
Paul,
I had an issue once that your post reminds me of. I rebuilt the
carburetors and after every flight as I was taxiing back at idle, the
engine would begin to run very rough and then would spill fuel out of
the vent lines. I traced it to the new float needles. Apparently at
low engine speed, there was enough vibration, that the float needles
wouldn't seat securely, allowing fuel to pass and then overloading the
float bowl. I went back to the original needles and no further
problems. This experience tells me that you may have a bad float or a
warn needle.
Lowell
From: PMorel
Sent: Wednesday, July 27, 2011 5:20 AM
Subject: Kitfox-List: 912 model IV engine idle
Has anyone else experienced this problem. I'm unable to sustain an
engine idle below 2200 rpm without the carburetors overloading and
flooding out. I suspect the angle of the engine due to the tailwheel
configuration and the float level of the fuel in the carburetor bowl.
My carbs are in sync with each other and would like to get the idle
down. Also, what would be an ideal idle speed for a 912?
Paul Morel
912 Speedster
Locust Grove, GA
Message 3
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| Subject: | Re: 912 model IV engine idle |
paul i had this same problem,i changed carbs, did no good, i synced the car
bs no good,i talked to the machinac working on the engine about checking th
e redive system,was told that could not be the problem i could not get the
engine to idle less the 2000 to 2200,talked him into taking the redive off,
rebuillding it, that solved the problem=0Athe way we checked it was take th
e prop off the engine, cranked it up,could idle it as low as you want, smoo
th as silk,prop back on same story,just be care to go to low idle when cran
king with no prop.i now idle at 1600 tom 1800 prm smooth.--- =0Afrank
Goggio--- wilmington-- nc- 912 speedster=0A=0AFrom: PMorel <pm
orel@bellsouth.net>=0ATo: kitfox-list@matronics.com=0ASent: Wednesday, July
27, 2011 8:20 AM=0ASubject: Kitfox-List: 912 model IV engine idle=0A=0A=0A
Has anyone else experienced this problem. -I'm unable to sustain an engin
e idle below 2200 rpm without the carburetors overloading and flooding out.
-I suspect the angle of the engine due to the tailwheel configuration an
d the float level of the fuel in the carburetor bowl. -My carbs are in sy
nc with each other and would like to get the idle down. -Also, what would
be an ideal idle speed for a 912?=0A-Paul Morel=0A912 Speedster=0A=0ALoc
==================
Message 4
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| Subject: | Re: 912 model IV engine idle |
Hi Paul,
I wouldn't be too fast to blame the carb angle. There are many tail dragger's out
there with 912's and no issues. Do you have fuel coming out of the vent tubes
and is your engine running real rough?
How old is the engine and how many hours? If it is older than 5 years have the
carbs been rebuilt? What is the mag drop at let's say 3400 rpm? It should be 50-60
rpm. It may be the carb needle jet, check the mixture screw on the bottom
of each carb to be turned out 1.5 turns. Make sure each choke is fully closing.
What rpm did you balance the carbs at? If it was 2500 or below that was too
low and your far better off doing a balance at 3500+ rpm and then making sure
they are balanced at idle. If you balance at 2500 rpm then I guarantee they will
be off up at 3500-4000 rpm. We don't fly next to idle rpm so the carbs shouldn't
be banced there.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center - Heavy Maint. Rated
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=347837#347837
Message 5
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| Subject: | Re: 912 model IV engine idle |
+ 1 on the float needles Lowell mentioned. I had the exact same problem and the
only way I could fix was to reuse the old needles. It was very odd as the only
difference I could tell was the tip material. I even sent my carbs to an authorized
Rotax dealer and had them checked out to see if I screwed something up.
Checked out fine but still had the same problem until I put the old needles
back in.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=347842#347842
Message 6
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I want to buy one of the earlier, shorter,oil tanks for the Rotax 912S.
Please contact me if you have one available. thanks,Bruce (650)504-4464 PDT
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