Today's Message Index:
----------------------
1. 04:18 AM - Re: oil level (Airgriff2@aol.com)
2. 04:30 AM - Re : Re: oil level (Gilles.Thesee@ac-grenoble.fr)
3. 06:13 AM - Re: 912 idle speed adjustment (=?ISO-8859-1?Q?J=F3hann_Gestur?=)
4. 06:44 AM - Re: 912 idle speed adjustment (Thom Riddle)
5. 10:31 AM - 2 Msgs - 05/30/06 (Erol Onderoglu)
6. 01:45 PM - Re: Re: 912 idle speed adjustment (Peter Rees)
7. 03:14 PM - Re: 912 idle speed adjustment (Thom Riddle)
8. 03:52 PM - Re: Re: 912 idle speed adjustment (Duncan McFadyean)
Message 1
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Thanks Tom. Is it 3 liters or 3 qts ? We didn't do the crankcase plug.
Thanks for the heads up. A friend stopped last night and answered my question
(I
believe) about the oil coming out of the tank when I rotated the prop after
hearing it gurgle. He said the oil system works by pumping oil from the engine
to the tank and back through the engine. When I heard the Gurgle and rotated
more, an additional amount of air was sent to the tank as it would normally
pressurize the tank and send oil back to the engine. With the cap off the
pressure sent the oil out of the top. Think of it as if the engine was running,
circulating the oil between the tank and engine and what would happen if you took
off the cap at that point. I guess the procedure is to stop when you 1st hear
the air enter the tank.
Fly Safe
Bob Griffin
Albany NY
Message 2
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Bob and all,
Is it 3 liters or 3 qts ?
The oil capacity is depending not only on the engine, but also on your specific
installation, oil lines, radiator and all. See the Operator's manual which came
withe the engine.
We didn't do the crankcase
> plug.
According to Rotax SBs, you should not open the crankcase plug during ordinary
oil changes
You may want to refer to the Operator and Maintenance manuals for further information.
If you don't have them, thy can be downloaded from the Rotax website.
Regards,
Gilles Thesee
http://contrails.free.fr
Message 3
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| Subject: | Re: 912 idle speed adjustment |
--> RotaxEngines-List message posted by: =?ISO-8859-1?Q?J=F3hann_Gestur?= <joeing701@internet.is>
Hello Thom.
I have the same engine and just did the balance adjustments on the
carbs, but the gage showed me that the timing was off. Not sure how to
adjust that on this engine? But the idle speed can not be adjusted below
1800, because the engine will not run at lower speed. My adjustments
were done on a hot engine, i.e. normal oil temp.
The gage I used were the same as sold by Lockwood and CPS.
I would appreciate any ideas on how to adjust the engine so that it may
run at lower idle speeds such as 1400 rpm.
Thanks,
Johann G.
Thom Riddle wrote:
> --> RotaxEngines-List message posted by: Thom Riddle
> <jtriddle@adelphia.net>
>
> During our annual inspection we balanced the carbs on the 912UL and
> adjusted the idle speed to 1400 rpm after the oil temperature was up
> to 120F. With the carbs. balanced the idle is much smoother than
> before. However, after flying the airplane for about an hour with the
> oil temps up into the normal operations range around 215F, when
> closing the throttle the idle speed went down to well under 1400 rpm.
>
> My question: Must the engine be up to normal operating oil temp
> (190-230F) when adjusting the idle speed?
>
> Thom in Buffalo
>
>
Message 4
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| Subject: | Re: 912 idle speed adjustment |
--> RotaxEngines-List message posted by: "Thom Riddle" <jtriddle@adelphia.net>
Johann,
Before our annual inspection our engine was idling (a bit roughly due to vaccumm
inbalance) at 1400 rpm with no problem, other than roughness. My old Titan Tornado,
sold recently, had the same engine and it idled smoothly at 1400 rpm.
It was that way when I got it and I never touched the carbs.
During the inspection we put the dual vaccumm gauges on the engine and noticed
that the vaccumm readings were different by about 2 inches so we balanced them
quickly but the idle was not smooth until we repinstalled the balance tube. We
then adjusted both idle speed screws the same amount to get it down to 1400
rpm. All this was done after warming up the engine on the ground to 120F oil temp.
After flying the airplane the next day, when fully warmed up, the idle speed was
well below 1400 rpm. Our next step, this afternoon will be to increase the idle
speed to perhaps 1600 rpm at 120F and see how it does after flying it to normal
temps. Final adjustment will be made right after the flight while it is
near normal operating temperature.
It is my understanding that the Rotax 912 series engines have no way for the owner/operator
to adjust the timing. It is fixed at the factory and not adjustable.
Your inability to get the engine to idle smoothly at 1400 rpm is due to carb vaccumm
inbalance. Use the gauges according to the Rotax manual to do this. Do
NOT expect it to idle smoothly while doing this because it probably won't without
the balance tube connected to both carbs. If you make sure the two vaccumm
gauges read the same, when you put the balance tube back on it should idle smoothly
at some rpm, then adjust each idle speed screw the exact same amount to
maintian the balance and change the idle speed. The purpose of using the vaccumm
gauges is to make sure that both carbs are opening the same amount at idle.
My original question was merely about what temperature the engine should be running
at to adjust the idle speed. Apparently, to do it right, it must be up to
normal op. temps., not just 120F.
Thom in Buffalo
FAA Powerplant Mechanic - but relatively new to Rotax w/ multiple carbs.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=37640#37640
Message 5
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| Subject: | 2 Msgs - 05/30/06 |
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Message 6
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| Subject: | Re: 912 idle speed adjustment |
--> RotaxEngines-List message posted by: "Peter Rees" <peter.rees01@tiscali.co.uk>
Can I please ask - where did the figure of 1400 RPM come from?? I was under
the impression that the minimum recommended idle speed was 1700. The Rotax
service manual specifically states that idle speeds that are too low will
result in gearbox wear / damage. Are we setting ours too high or are you too
low?
Peter
----- Original Message -----
From: "Thom Riddle" <jtriddle@adelphia.net>
Sent: Wednesday, May 31, 2006 2:43 PM
Subject: RotaxEngines-List: Re: 912 idle speed adjustment
> --> RotaxEngines-List message posted by: "Thom Riddle"
> <jtriddle@adelphia.net>
>
> Johann,
>
> Before our annual inspection our engine was idling (a bit roughly due to
> vaccumm inbalance) at 1400 rpm with no problem, other than roughness. My
> old Titan Tornado, sold recently, had the same engine and it idled
> smoothly at 1400 rpm. It was that way when I got it and I never touched
> the carbs.
>
> During the inspection we put the dual vaccumm gauges on the engine and
> noticed that the vaccumm readings were different by about 2 inches so we
> balanced them quickly but the idle was not smooth until we repinstalled
> the balance tube. We then adjusted both idle speed screws the same amount
> to get it down to 1400 rpm. All this was done after warming up the engine
> on the ground to 120F oil temp.
>
> After flying the airplane the next day, when fully warmed up, the idle
> speed was well below 1400 rpm. Our next step, this afternoon will be to
> increase the idle speed to perhaps 1600 rpm at 120F and see how it does
> after flying it to normal temps. Final adjustment will be made right after
> the flight while it is near normal operating temperature.
>
> It is my understanding that the Rotax 912 series engines have no way for
> the owner/operator to adjust the timing. It is fixed at the factory and
> not adjustable.
>
> Your inability to get the engine to idle smoothly at 1400 rpm is due to
> carb vaccumm inbalance. Use the gauges according to the Rotax manual to
> do this. Do NOT expect it to idle smoothly while doing this because it
> probably won't without the balance tube connected to both carbs. If you
> make sure the two vaccumm gauges read the same, when you put the balance
> tube back on it should idle smoothly at some rpm, then adjust each idle
> speed screw the exact same amount to maintian the balance and change the
> idle speed. The purpose of using the vaccumm gauges is to make sure that
> both carbs are opening the same amount at idle.
>
> My original question was merely about what temperature the engine should
> be running at to adjust the idle speed. Apparently, to do it right, it
> must be up to normal op. temps., not just 120F.
>
> Thom in Buffalo
> FAA Powerplant Mechanic - but relatively new to Rotax w/ multiple carbs.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=37640#37640
>
>
>
Message 7
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| Subject: | Re: 912 idle speed adjustment |
--> RotaxEngines-List message posted by: "Thom Riddle" <jtriddle@adelphia.net>
Peter,
It is in the Rotax 912 series Operators Manual in Section 10.1.1) Operating Speeds
and Limits (912 UL/A/F).
--------
Thom in Buffalo
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=37740#37740
Message 8
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| Subject: | Re: 912 idle speed adjustment |
--> RotaxEngines-List message posted by: "Duncan McFadyean" <ami@mcfadyean.freeserve.co.uk>
On some aircraft (eg Europa) a fast idle speed will result in too much
residual thrust and difficulty in landing within a reasonably short
distance. A low idle speed helps in this temporary situation, although the
engine does not then have to be left at a low idle speed once the landing is
complete.
Duncan Mcf.
----- Original Message -----
From: "Peter Rees" <peter.rees01@tiscali.co.uk>
Sent: Wednesday, May 31, 2006 9:42 PM
Subject: Re: RotaxEngines-List: Re: 912 idle speed adjustment
> --> RotaxEngines-List message posted by: "Peter Rees"
> <peter.rees01@tiscali.co.uk>
>
> Can I please ask - where did the figure of 1400 RPM come from?? I was
> under the impression that the minimum recommended idle speed was 1700. The
> Rotax service manual specifically states that idle speeds that are too low
> will result in gearbox wear / damage. Are we setting ours too high or are
> you too low?
>
> Peter
>
>
> ----- Original Message -----
> From: "Thom Riddle" <jtriddle@adelphia.net>
> To: <rotaxengines-list@matronics.com>
> Sent: Wednesday, May 31, 2006 2:43 PM
> Subject: RotaxEngines-List: Re: 912 idle speed adjustment
>
>
>> --> RotaxEngines-List message posted by: "Thom Riddle"
>> <jtriddle@adelphia.net>
>>
>> Johann,
>>
>> Before our annual inspection our engine was idling (a bit roughly due to
>> vaccumm inbalance) at 1400 rpm with no problem, other than roughness. My
>> old Titan Tornado, sold recently, had the same engine and it idled
>> smoothly at 1400 rpm. It was that way when I got it and I never touched
>> the carbs.
>>
>> During the inspection we put the dual vaccumm gauges on the engine and
>> noticed that the vaccumm readings were different by about 2 inches so we
>> balanced them quickly but the idle was not smooth until we repinstalled
>> the balance tube. We then adjusted both idle speed screws the same amount
>> to get it down to 1400 rpm. All this was done after warming up the engine
>> on the ground to 120F oil temp.
>>
>> After flying the airplane the next day, when fully warmed up, the idle
>> speed was well below 1400 rpm. Our next step, this afternoon will be to
>> increase the idle speed to perhaps 1600 rpm at 120F and see how it does
>> after flying it to normal temps. Final adjustment will be made right
>> after the flight while it is near normal operating temperature.
>>
>> It is my understanding that the Rotax 912 series engines have no way for
>> the owner/operator to adjust the timing. It is fixed at the factory and
>> not adjustable.
>>
>> Your inability to get the engine to idle smoothly at 1400 rpm is due to
>> carb vaccumm inbalance. Use the gauges according to the Rotax manual to
>> do this. Do NOT expect it to idle smoothly while doing this because it
>> probably won't without the balance tube connected to both carbs. If you
>> make sure the two vaccumm gauges read the same, when you put the balance
>> tube back on it should idle smoothly at some rpm, then adjust each idle
>> speed screw the exact same amount to maintian the balance and change the
>> idle speed. The purpose of using the vaccumm gauges is to make sure that
>> both carbs are opening the same amount at idle.
>>
>> My original question was merely about what temperature the engine should
>> be running at to adjust the idle speed. Apparently, to do it right, it
>> must be up to normal op. temps., not just 120F.
>>
>> Thom in Buffalo
>> FAA Powerplant Mechanic - but relatively new to Rotax w/ multiple carbs.
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=37640#37640
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
> http://www.matronics.com/Navigator?RotaxEngines-List
> http://wiki.matronics.com
>
>
>
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