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krazydoc33(at)gmail.com
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 Posted: Sat Sep 07, 2013 1:59 pm Post subject: RotaxEngines-List Digest: 3 Msgs - 07/09/13 |
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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(at)matronics.com (rotaxengines-list(at)matronics.com)> wrote:
[quote]*
=========================
Online Versions of Today's List Digest Archive
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Today's complete RotaxEngines-List Digest can also be found in either of the
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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: Re: I Love Left handed drill bits
From: Richard Girard <aslsa.rng(at)gmail.com (aslsa.rng(at)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(at)gmail.com (riddletr(at)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: Large mag drop
From: "krazydoc33" <galaxyone(at)juno.com (galaxyone(at)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: Re: Large mag drop
From: "Roger Lee" <ssadiver1(at)yahoo.com (ssadiver1(at)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 [url=tel:520-574-1080]520-574-1080[/url] TRY HOME FIRST
Cell [url=tel:520-349-7056]520-349-7056[/url]
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=404355#404355
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Sun Sep 08, 2013 4:46 am Post subject: Re: RotaxEngines-List Digest: 3 Msgs - 07/09/13 |
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Hi Henry,
Glad the problem is solved. As far as the rich part, do not base any rich conclusions on black dry soot on the plugs when it has been run at idle. You need to run the engine over 4000 for 5-10 minutes and then shut it down. It is normal to have dry sooty plugs from idle, but that goes away at the higher rpms. Not everyone has it or does it happen to the same plugs all the time. I would fly it a time or two before making any solid conclusions.
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Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
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