Today's Message Index:
----------------------
1. 07:25 AM - Re: Rotax 914 Right Mag rough (Thom Riddle)
2. 01:06 PM - Re: OFF>L>R>Both>Start (FLYaDIVE)
3. 01:54 PM - Re: Re: OFF>L>R>Both>Start (Clive Richards)
Message 1
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| Subject: | Re: Rotax 914 Right Mag rough |
John Goodings,
Following was the original question about tyre changing:
How the hell do i change a tyre if i get a flat away from base.?
Your self lift procedure is fine for getting the tyre/tire off the ground. Do you
carry large carboard boxes around with you when you fly? How about a saw horse
or other bulky object on which you can support the wing you lift way out away
from the wheel?
--------
Thom Riddle
Buffalo, NY (9G0)
Kolb Slingshot SS-021
no engine
FOR SALE
Diamond Katana DA20-A1
Rotax 912 F3
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=390597#390597
Message 2
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| Subject: | Re: OFF>L>R>Both>Start |
Robert:
THANK YOU for explaining the system.
AND it is a CDI System... That is way better than a MAG.
Thanks Robert,
Barry
On Sun, Dec 16, 2012 at 8:04 AM, Robert Borger <rlborger@mac.com> wrote:
> Barry,
>
> You are absolutely correct for a magneto based system. Rotax does not us
e
> magnetos. Rotax uses a CDI (Capacitive Discharge Ignition) system, a typ
e
> of electronic ignition that does not require a separate power source. Li
ke
> a mag, the ignition module is grounded to prevent it from firing. Your
> explanation is, again, correct for the Rotax if you substitute "ignition
> module" for "MAG."
>
> Where it falls apart is when you went to "Impulse Coupler." Because it's
> not a mag, there are no impulse couplers. The Rotax CDI system is
> triggered by a pair of tabs on the flywheel. Below ~800 RPM the system
> triggers on the trailing edge of the tab (4=BABTDC or 3=BAATDC depending
on the
> age of the system). Once the engine starts, >800 RPM, the system trigger
s
> on the leading edge of the tab.
>
> Most Rotax folks use the term "MAG" for simplicity sake, because that's
> what most folks are familiar with.
>
> Kind of like the "Choke" which isn't really a choke, it's a separate
> little carb which is activated to provide a richer mixture on startup.
> Same function as the choke on a "normal" engine, just a different physic
al
> implementation.
>
> Alan,
>
> The only sure way to determine which module is grounded when your key is
> in any specific position is by making a continuity check from the back of
> the key to the grounding lead on each ignition module. Or, I guess you
> could put the key in a position and see which of your grounding leads has
> continuity to ground, that is, which is grounded. Your older system uses
4
> modules, my system is just enough newer (2002) to use only two modules,
> labeled A & B. So, I guess I should really have my two grounding switche
s
> labeled A & B rather than L & R. And on the 914. one module fires the
> upper and the other module the lower plugs. On the 912 & 912S, a module
> fires the upper on one side and lower on the other.
>
> The Rotax 9xx engines aren't your daddy's Lycoming/Continental. Twin
> carbs, CDI, gearbox and most happy when turning over 5000 RPM while burni
ng
> 4 - 5 gph.
>
> Blue skies & tailwinds,
> Bob Borger
> Europa XS Tri, Rotax 914, Airmaster C/S Prop.
> Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP
> 3705 Lynchburg Dr.
> Corinth, TX 76208-5331
> Cel: 817-992-1117
> rlborger@mac.com
>
> On Dec 16, 2012, at 12:34 AM, FLYaDIVE <flyadive@gmail.com> wrote:
>
> Alan:
>
> It is very simple. Don't overload yourself with too much info.
> OFF = BOTH MAGs are Grounded.
> L = Left = Left MAG is HOT -and Right MAG is Grounded.
> R = Right = Right MAG is HOT - and Left MAG is Grounded.
> BOTH = BOTH MAGS are HOT. NO MAGs are Grounded.
> START = START the engine by Grounding the Right MAG and Turning ON the
> Starter Motor.
>
> The rule to remember is: MAGs are ALWAYS HOT.
> The only way of removing a MAG from the system is to GROUND out the outpu
t
> of the MAG... To electrical Ground.
>
> NOW, of course I have to confuse things here just a bit. I have to ask
> you and the gaggle a couple of questions:
> Does Rotax use an IMPULSE Coupler on one MAG? Or...
> Does Rotax use TWO IMPULSE Copuler's - One on each MAG?
> I'll explain my question later.
>
> Barry
>
Message 3
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| Subject: | Re: OFF>L>R>Both>Start |
Alan
I suspect you will find your igintion switch is marked as
my discription so BAT terminal is positive from a fuse or circuit breaker &
S goes to starter solenoid.
The Push button you show will have a common terminal with one of the other
terminals will be open to this & the other closed.
If your ignition switch is as I described you can as I previously said link
the outer ground terminal GRD to R terminal you will then start on the
module connected to the L terminal.
(It is the inner GRD terminal which is the one actualy connected to
ground)
As others have stated to check make sure engine cannot start or turn on
starter remove plug on lead from the switch at an ignition module check with
a multimeter on continuity (Ohms) range that the wire from the switch is
connected to ground (engine block) in off position then check in left right
both & start positions a modual is live when not connected to ground you
can mark left or right as appropriate check which coil pack this moudule is
pluged into to see which plugs it fires. Refit plug after testing.
Clive
----- Original Message -----
From: "Alan Carter" <alancarteresq@onetel.net>
Sent: Sunday, December 16, 2012 9:17 PM
Subject: RotaxEngines-List: Re: OFF>L>R>Both>Start
> <alancarteresq@onetel.net>
>
> Hi Bob.
> OK will not try it. will re read all.
> Alan
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=390554#390554
>
>
>
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