Today's Message Index:
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1. 02:59 PM - Re: RotaxEngines-List Digest: 3 Msgs - 07/09/13 (Henry Roden)
2. 03:25 PM - Re: 912uls hard starting (george may)
Message 1
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| Subject: | Re: RotaxEngines-List Digest: 3 Msgs - 07/09/13 |
It took awhile to track down what was causing the large mag drops. For the
sake of accuracy i should refer to them as ignition modules not mags.
Just after I last wrote the Dynon Skyview display failed and needed to be
returned to Dynon for repair. A number of other things happened, to me and
not the plane, at the same time causing further delays. The ignition wires
were connected to the correct cylinders, according to the wiring labels and
the cylinder markings. BUT the cylinders were mis-marked on the left hand
side! (I take the "fifth" on who did the marking! )
Correcting that cleared up the the large RPM drop and all appears to be
normal although it still looks like it is running rich based on the plugs
and the exhaust pipe. After more than 60 years around auto engines I am
surprised that a four cylinder engine will run at all with two plug wires
reversed. Thanks for all of the suggestions.
Henry
On Wed, Jul 10, 2013 at 1:01 AM, RotaxEngines-List Digest Server <
rotaxengines-list@matronics.com> wrote:
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> RotaxEngines-List Digest Archive
> ---
> Total Messages Posted Tue 07/09/13: 3
> ----------------------------------------------------------
>
>
> Today's Message Index:
> ----------------------
>
> 1. 07:47 AM - Re: Re: I Love Left handed drill bits (Richard Girard)
> 2. 08:44 PM - Large mag drop (krazydoc33)
> 3. 11:06 PM - Re: Large mag drop (Roger Lee)
>
>
> ________________________________ Message 1
> _____________________________________
>
>
> Time: 07:47:38 AM PST US
> Subject: Re: RotaxEngines-List: Re: I Love Left handed drill bits
> From: Richard Girard <aslsa.rng@gmail.com>
>
> Thom, As Roger noted the Locktite comes applied to the fixation screw in
> dry form. Also, the use of Locktite 221 is specified for this part in the
> 912 Illustrated Parts Catalog.
>
> Rick Girard
>
>
> On Mon, Jul 8, 2013 at 7:19 AM, Thom Riddle <riddletr@gmail.com> wrote:
>
> > >
> >
> > Anyone who thinks that this connection needs thread locker clearly does
> > not understand that aluminum has a very high coefficient of friction. In
> > use, there is no external torque that would tend to loosen this
> connection.
> > Applying thread locker to this connection is unnecessary and a very bad
> > idea.
> >
> > --------
> > Thom Riddle
> > Buffalo, NY (9G0)
> >
> >
> > Don't worry about old age... it doesn't last very long.
> > - Anonymous
> >
> >
> > Read this topic online here:
> >
> > http://forums.matronics.com/viewtopic.php?p=404178#404178
> >
> >
>
>
> --
> Zulu Delta
> Mk IIIC
> Thanks, Homer GBYM
>
> It isn't necessary to have relatives in Kansas City in order to be unhappy.
> - Groucho Marx
>
> ________________________________ Message 2
> _____________________________________
>
>
> Time: 08:44:08 PM PST US
> Subject: RotaxEngines-List: Large mag drop
> From: "krazydoc33" <galaxyone@juno.com>
>
>
> I have a 912ULS in a RV-12, the plane has just been signed off by the DAR
> but I
> have not yet flown it. The engine starts fine right away and has about 2
> hours
> of taxi time on the engine. I get 5050 rpm at wide open throttle and the
> airport
> is at ~5000'. The weather here is in the 90+range shortly after 9:00 am.
> The problem I am having, which has kept me on the ground, is the mag drop.
> It
> is about 650 rpm on each ignition and they both run rough. They are close
> together
> but that much of a rpm drop seems very unusual. The exhaust pipe is sooted
> which suggests it is running rich. The plugs also are very black and
> cleaning
> them has no effect. All the other temperatures look normal. I tried a five
> minute
> run at full throttle and that had no effect either. Any ideas where to look
> next will be greatly appreciated.
> Thanks
> Henry
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=404353#404353
>
>
> ________________________________ Message 3
> _____________________________________
>
>
> Time: 11:06:07 PM PST US
> Subject: RotaxEngines-List: Re: Large mag drop
> From: "Roger Lee" <ssadiver1@yahoo.com>
>
>
> Hi Henry,
>
>
> 650 is way to high. The good thing is they are almost equal. What rpm are
> you doing
> the mag drop at?
> What is the plug gap? It should be between .023 and .027. Better to be
> the wider
> gap for the summer months. Are you running an electric pump with the
> mechanical
> all the time? Have you synced these carbs? Did you put a fuel
> re-circulation line in during the build. The new pumps really need one.
> Where did
> you mount the carb vent tubes? These carbs almost sound like they are
> flooding,
> but we could use a little more info.
>
> It is possible you have a wire connected wrong.
>
> --------
> 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=404355#404355
>
>
Message 2
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| Subject: | 912uls hard starting |
Richard and Roger--
Thanks for taking the effort to make suggestions on my hard starting issu
e. I did check the ignition modules and they were not the numbers that mig
ht have been an issue. And I loved the ice on the modules solution. Haven'
t had a need to try that yet but I'll keep it in my book of tips. I fully
convinced myself it was not fuel related=2C and therefore it had to be elec
trical. Turns out that it was a low battery=2C even though the it seemed t
o be turning plenty fast enough to start the engine. I put a boost charge
across the battery and it started fine. I'm using an Odessy 680 battery. I
t was measuring 12.7 volts when I had the trouble starting. This is a littl
e below the 12.8 v 80% level of charge which I assumed would have been enou
gh to start the engine. A fully charged battery was measured at 13.1 V. Th
e battery is only 1 year old. I have since spoken to a couple of other expe
rimental builders/pilots and they confirmed the they also had issues with t
his battery after about a year of service. I now am using a battery tender
and the battery is always fully charged when I go to fly. No more starting
issues.
George
601XLB--480hrs.
Subject: Re: RotaxEngines-List: 912uls hard starting
From: aslsa.rng@gmail.com
George=2C Do you have ignition modules p/n 966 726? These are a known probl
em and give symptoms you describe. If you do have these part number ignitio
n modules=2C call Lockwood and ask to talk to Aaron.
Rick Girard
do not archive
On Tue=2C Aug 27=2C 2013 at 5:38 PM=2C george may <gfmjr_20@hotmail.com> wr
ote:
Sorry about the confusion in the title
From: gfmjr_20@hotmail.com
Subject: RE: RotaxEngines-List: Running 582 Engines LOP
Just wanted to check with the group before I begin my carb rebuilds. I hav
e a 912uls on a Zodiac 601XLB that has started to be hard starting =2C in f
act it will not start now unless I spray starting fluid into the air intake
. Only did it once to convince myself it was a fuel issue. the engine star
ted and would restart after an hour. However=2C if I leave the plane for a
week or so it will not start. The engine acts like it is not getting fuel.
I've pulled the carb bowls and all looks fine. Fuel in bowl and fuel is
about 1/2 inch from top. Engine has 450 hours without a carb rebuild. A
ny other ideas what it could be? All input appreciated
Thanks
George
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--
Zulu Delta
Mk IIIC
Thanks=2C Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
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