Today's Message Index:
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1. 10:04 AM - Rotax 914 Won't Start (AmphibFlyer)
2. 02:42 PM - Re: Rotax 914 Won't Start (FLYaDIVE)
3. 03:58 PM - Re: Rotax 914 Won't Start (AmphibFlyer)
4. 04:26 PM - Re: Rotax 914 Won't Start (lucien)
Message 1
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| Subject: | Rotax 914 Won't Start |
A friend's Rotax 914 won't start--actually, it fires up, but won't get above about
900 rpm.
When the weather was warm, the engine started and ran smoothly. But had trouble
getting past 900 rpm on the last successful start, when the weather was starting
to get cold. And now it just won't do it at all.
I have a theory, but before mentioning it to the owner, I'd like to ask what you
guys think is the cause.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=279115#279115
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| Subject: | Re: Rotax 914 Won't Start |
SeaRay:
Ya gots to be more exact.
What OAT?
How long has the engine soaked at cold temps?
What OIL?
What viscosity oil?
Is the fuel fresh?
>From what you say ... It DID get above 900 RPM just took a long time to get
the engine warm?
Did you PRE-HEAT the engine?
Sure sounds like PRE-HEAT should of been the first step.
A fellow I know NEVER used pre-heat on his O-360 and the engine ran fine for
many a year. He just had the engine rebuilt - TBO ya know. This being the
first winter with the new engine (less than 25 hrs) the old no pre-heat
procedure DID NOT WORK. It would not even turn over. Starter froze
engaged. YET! As soon as the temps got to 50 F the thing kicked over in
one blade.
So, what theory do you have?
Barry
On Tue, Dec 29, 2009 at 1:03 PM, AmphibFlyer <
SeaRey@abstractconcreteworks.com> wrote:
> <SeaRey@AbstractConcreteWorks.com>
>
> A friend's Rotax 914 won't start--actually, it fires up, but won't get
> above about 900 rpm.
>
> When the weather was warm, the engine started and ran smoothly. But had
> trouble getting past 900 rpm on the last successful start, when the weather
> was starting to get cold. And now it just won't do it at all.
>
> I have a theory, but before mentioning it to the owner, I'd like to ask
> what you guys think is the cause.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=279115#279115
>
>
Message 3
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| Subject: | Re: Rotax 914 Won't Start |
flyadive(at)gmail.com wrote:
>
> From what you say ... It DID get above 900 RPM just took a long time to get
the engine warm?
Nope, it didn't get above 900 rpm. It maxed out there and wouldn't accelerate even
to normal idle speed.
The last time it ran normally, the OAT was about 60 F. It had trouble getting past
900, but did after several seconds of chugging. At 45 F it would fire on all
cylinders but couldn't break 900 rpm (approximately). I didn't pre-heat the
engine, but I'm sure that low temperature is not the problem; it just makes the
problem worse. These engines start just fine down to 0 F and below if the spark
plug gaps are correct (.024, or less), which they were on this engine.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=279149#279149
Message 4
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| Subject: | Re: Rotax 914 Won't Start |
AmphibFlyer wrote:
>
> flyadive(at)gmail.com wrote:
> >
> > From what you say ... It DID get above 900 RPM just took a long time to get
the engine warm?
>
> Nope, it didn't get above 900 rpm. It maxed out there and wouldn't accelerate
even to normal idle speed.
>
> The last time it ran normally, the OAT was about 60 F. It had trouble getting
past 900, but did after several seconds of chugging. At 45 F it would fire on
all cylinders but couldn't break 900 rpm (approximately). I didn't pre-heat the
engine, but I'm sure that low temperature is not the problem; it just makes
the problem worse. These engines start just fine down to 0 F and below if the
spark plug gaps are correct (.024, or less), which they were on this engine.
Don't know if 2-stroke experience crosses over here, but two things that I've seen
cause this kind of behavior are
- huge, massively heavy prop
- weak gearbox springs
It always amazes me the gigantic 2 ton props a lot of guys hang on these things
- what prop, how big and how many blades? If it's way past the MOI limit on the
912 GB (6000 kg/cm3 last I looked in the manual, same as the 2-stroke C box)
the engine simply may not be able to overcome it.
Same if the springs are worn and the preload is too weak. It'll be fighting the
gearbox in that case too.
All that could be aggravated by a cold start as well...
If it's not that, I'm out of ideas and would like to know what it is once you finally
figure out what it is...
LS
--------
LS
Titan II SS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=279154#279154
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