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1. 09:50 AM - Re: [Non-DoD Source] Re: M14PEngines-List Digest: 0 Msgs - 03/03/17 (Bitterlich, Mark G CIV NAVAIR, WD)
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| Subject: | Re: M14PEngines-List Digest: 0 |
Msgs - 03/03/17
Yes, I know EXACTLY how these work, have taken them apart, repaired and adjusted
them on several occasions. They consist of an autotransformer where when power
is supplied a relay coil is energized which opens a set of contacts. When
the contacts open, power is removed from the relay coil and a spring closes it,
which again completes the circuit and re-energizes the coil winding yet again.
This leads to a rapid opening and closing of the relay contacts which is
commonly called a "buzzer" and the sound it makes explains why it is called that.
The contacts on the relay coil that when energized also power the primary
portion of the autotransformer which then creates a magnetic field that passes
through the rest of the windings. This produces a high voltage pulse, which
also occurs when the relay contacts open and the field collapses again.
The relay contacts are not encapsulated and are easily visible if the unit is taken
apart which is very easy to do. These contacts can be cleaned or "burnished"
to gain some additional life and they can also be ADJUSTED for proper contact
gap, which I can't remember the exact value of, I am sorry to say. However,
any 24 volt DC source can power this thing, and the high voltage wire can
be tied to a spark plug which is then also grounded to the negative side of the
battery, allowing you to actually power it up and adjust the contacts for the
biggest spark at the spark plug, or any other air gap for example.
These devices are usually blamed for hard starting, or failure to start and that
is oftentimes an incorrect assumption. Bleed the air out of your system (if
yours is pneumatic and hit the starter button. You should be able to easily
hear this unit "buzzing" away. If it does not make a sound, it is either missing
voltage, or needs to be repaired. Suspect missing voltage first and make
sure you check it under load. If it makes the buzzing sound, take the cap off
the mag, and rotate the prop until the rotor lines up with a plug contact on
the cap. Pull the plug and check for spark when the button is depressed. While
the cap is off, inspect the cap and rear most rotor point (rear most from direction
of rotation) for excessive wear. Next, suspect the high tension wire
that leads from the coil to the mag. It often fails.
In most designs this units 28 volt wire is attached to a terminal post inside the
unit, so in order to get it out of the aircraft you'll have to take it apart
anyway. A good thing to know is that the CJ-6 uses the exact same part on their
engines and it is available from Doug Sapp of CJ-6 parts fame.
George Coy makes a Shower of Sparks unit selling for about $385 http://www.motorstarna.com/kits
Mark Bitterlich
-----Original Message-----
From: owner-m14pengines-list-server@matronics.com [mailto:owner-m14pengines-list-server@matronics.com] On Behalf Of John B
Sent: Saturday, March 04, 2017 8:36 AM
Subject: [Non-DoD Source] M14PEngines-List: Re: M14PEngines-List Digest: 0 Msgs
- 03/03/17
Shower-of-sparks: Does anyone know exactly how these work? Is there a Western
replacement available?
Thank you.
John B
Yak 55M
On Sat, Mar 4, 2017 at 2:01 AM, M14PEngines-List Digest Server <m14pengines-list@matronics.com>
wrote:
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