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1. 12:22 PM - Re: Re: [Pulsar-Aviators] New Stator Coil In - Flying Again (Ron Koval)
2. 01:27 PM - Re: Re: [Pulsar-Aviators] New Stator Coil In - Flying Again (Bernard Wilder)
Message 1
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| Subject: | Re: [Pulsar-Aviators] New Stator Coil In - Flying Again |
Doug,=0A=C2-=0AForgive me for not having heard, ignition systems fail on
shutdown.=C2- I find that very hard to believe, understanding how they wo
rk and how we shut=C2-our ignition=C2-down for mag checks.=0A=C2-=0AI
n our CDI ignition system the stator coil charges up a capacitor, then a se
cond coil triggers an SCR (solid state device; silicon controlled rectifier
) and discharges the capacitor into=C2-the ignition coil which has a step
up winding that fires the spark plug.=C2- All we do to shut this down is
ground the very front end of the process, by grounding the stator coil so
no charge is provided to the module that houses the capacitor.=C2- Lycomi
ngs, Continental engines do the same except, they use the magnetic field=C2
-of mag coil, open a set of grounding points,=C2-which produces a=C2-
sudden magnetic field change, which then causes current to flow in the prim
ary coil,=C2-and the secondary coil step up winding fires the spark plug.
=C2- They also, at the front end,=C2-ground the primary coil using the
P-lead to disable ignition.=C2- The only thing that is getting beat up du
ring a mag check is the mag switch.=0A=C2-=0AOur ignition systems are not
very susceptible to spikes or noise, because they are the worst source, th
e culprit of the greatest transients and noise in our aircraft.=0A=0AWith t
he faults that I have found at the connectors coupling the wires from stato
r coil to the CDI module, the most likely root cause is vibration mechanica
lly breaking the wire at the connector.=C2- I have one more side of the s
tator coil to find out where it broke down.=C2- I am very anxoius to find
this other fault and protentially be able to fix it and have a back up sta
tor coil.=0A=0ABest regards,=0A=0ARon=0A=0A=0A_____________________________
___=0AFrom: "dougwitkowski@netscape.net" <dougwitkowski@netscape.net>=0ATo:
Pulsar-Aviators@yahoogroups.com; Pulsar-List@matronics.com =0ASent: Monday
, August 19, 2013 10:06 AM=0ASubject: Pulsar-List: Re: [Pulsar-Aviators] Ne
w Stator Coil In - Flying Again=0A=0ACommon knowledge is that ignition syst
ems fail on=C2-shutdown (possible voltage spikes??).=C2- Testing pre-sh
utdown probably won't help,=C2- the testing itself may cause the failure.
=C2- In my mag check procedure, it's not the RPM drop that's important, i
t's the return to normal RPM on 'both' that is important.=0A=0A=0A=0A-----O
riginal Message----- From: Ron Koval <ronko11@yahoo.com> To: Pulsar Builder
s <Pulsar-List@matronics.com>; Pulsar-Aviators <Pulsar-Aviators@yahoogroups
.com> Sent: Mon, Aug 19, 2013 9:50 am Subject: [Pulsar-Aviators] New Stator
Coil In - Flying Again =0A=C2- =0APulsar Friends,=0A=0APut in the new st
ator coil in my 582 and ran it through=C2- 4 rounds of touch and goes Sun
day evening.=C2- Relief ... the Pulsar and I are looking forward to the c
onvention.=0A=0AAfter this experience, I learned and added a step to my eng
ine shut down procedure, do a mag check.=C2- It is nice to know that you
completed your flight with both mags still working and if one ignition circ
uit, perhaps fails, due to everything under the cowl at high temperatures,
it is nice to know.=C2- Also if this were perhaps the flight that one ign
ition circuit fails (more likely to fail engine running than in the hanger)
, it is better to know now rather than on the ramp wanting to take off per
plan.=0A=0AI discovered that in my defective stator coil there were 2 inter
mittent connections, right at the rubber 2 conductor connector of my defect
ive stator coil.=C2- I am on a mission to find out where the other side c
harging coil is open.=C2- It would be nice to discover that it also has a
simple connector wire problem and not an open within one of the 2 coils th
at make up the charging circuit.=0A=0AEven after taking extra care to clean
all of the contacts (grounds, power ...) putting everything back together
with the new stator coil, my analog tach is reading way high.=C2- Fortuna
tely my digital tach is what I reference.=C2- Last time I fixed it, I add
ed a stainless steel external tooth lock washer on the heavy ground to dig
into the metal surfaces and provide a good connection to the engine block (
but I cleaned this terminal again and still have the lock-washer in place.
=0A=0ALooking forward to the convention.=0A=0ARonko=0A=0A=0A__._,_.___=0ARe
ply via web post Reply to sender Reply to group Start a New Topic Messa
ges in this topic (1) =0ARecent Activity: * New Members 1 * New Phot
os 5 =0AVisit Your Group =0A =0ASwitch to: Text-Only, Daily Digest
=A2 Unsubscribe =A2 Terms of Use =A2 Send us Feedback =0A. =0A_
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| Subject: | Re: [Pulsar-Aviators] New Stator Coil In - Flying Again |
The instructor of the Rotax courses at Lockwood says that if the engine was
running properly at shutdown and it won't start up, it will never be due to
ignition failure.
Bernie Wilder
On Tue, Aug 20, 2013 at 3:19 PM, Ron Koval <ronko@att.net> wrote:
> Doug,
>
> Forgive me for not having heard, ignition systems fail on shutdown. I
> find that very hard to believe, understanding how they work and how we
> shut our ignition down for mag checks.
>
> In our CDI ignition system the stator coil charges up a capacitor, then a
> second coil triggers an SCR (solid state device; silicon controlledrectif
ier) and discharges the capacitor into the ignition coil which has a
> step up winding that fires the spark plug. All we do to shut this down i
s
> ground the very front end of the process, by grounding the stator coil so
> no charge is provided to the module that houses the capacitor. Lycomings
,
> Continental engines do the same except, they use the magnetic field of ma
g
> coil, open a set of grounding points, which produces a sudden magnetic
> field change, which then causes current to flow in the primary coil, and
> the secondary coil step up winding fires the spark plug. They also, at t
he
> front end, ground the primary coil using the P-lead to disable ignition.
> The only thing that is getting beat up during a mag check is the mag swit
ch.
>
> Our ignition systems are not very susceptible to spikes or noise, because
> they are the worst source, the culprit of the greatest transients and
> noise in our aircraft.
>
> With the faults that I have found at the connectors coupling the wires
> from stator coil to the CDI module, the most likely root cause is
> vibration mechanically breaking the wire at the connector. I have one mo
re
> side of the stator coil to find out where it broke down. I am very anxoi
us
> to find this other fault and protentially be able to fix it and have a ba
ck
> up stator coil.
>
> Best regards,
>
> Ron
>
> *From:* "dougwitkowski@netscape.net" <dougwitkowski@netscape.net>
> *To:* Pulsar-Aviators@yahoogroups.com; Pulsar-List@matronics.com
> *Sent:* Monday, August 19, 2013 10:06 AM
> *Subject:* Pulsar-List: Re: [Pulsar-Aviators] New Stator Coil In - Flying
> Again
> Common knowledge is that ignition systems fail on shutdown (possible
> voltage spikes??). Testing pre-shutdown probably won't help, the
> testing itself may cause the failure. In my mag check procedure, it's no
t
> the RPM drop that's important, it's the return to normal RPM on 'both' th
at
> is important.
>
>
> -----Original Message----- From: Ron Koval <ronko11@yahoo.com> To: Pulsar
> Builders <Pulsar-List@matronics.com>; Pulsar-Aviators <
> Pulsar-Aviators@yahoogroups.com> Sent: Mon, Aug 19, 2013 9:50 am Subject:
> [Pulsar-Aviators] New Stator Coil In - Flying Again
>
> Pulsar Friends,
>
> Put in the new stator coil in my 582 and ran it through 4 rounds of touc
h
> and goes Sunday evening. Relief ... the Pulsar and I are looking forward
> to the convention.
>
> After this experience, I learned and added a step to my engine shut down
> procedure, do a mag check. It is nice to know that you completed your
> flight with both mags still working and if one ignition circuit, perhaps
> fails, due to everything under the cowl at high temperatures, it is nice
to
> know. Also if this were perhaps the flight that one ignition circuit fai
ls
> (more likely to fail engine running than in the hanger), it is better to
> know now rather than on the ramp wanting to take off per plan.
>
> I discovered that in my defective stator coil there were 2 intermittent
> connections, right at the rubber 2 conductor connector of my defective
> stator coil. I am on a mission to find out where the other side charging
> coil is open. It would be nice to discover that it also has a simple
> connector wire problem and not an open within one of the 2 coils that mak
e
> up the charging circuit.
>
> Even after taking extra care to clean all of the contacts (grounds, power
> ...) putting everything back together with the new stator coil, my analog
> tach is reading way high. Fortunately my digital tach is what I
> reference. Last time I fixed it, I added a stainless steel external toot
h
> lock washer on the heavy ground to dig into the metal surfaces and provid
e
> a good connection to the engine block (but I cleaned this terminal again
> and still have the lock-washer in place.
>
> Looking forward to the convention.
>
> Ronko
>
>
> __._,_.___
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