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Isn't 20 amps excessive? I mean, the entire engine should run off 20
amps, not just one pair of coils...
Dave
James Maher wrote:
Dave,
I use this switch with Tracy's EC-2 controller.
The coil disable inputs are wired to this switch and function
when controller "B" is selected.
I also have 2 separate 20A breakers ( the push/pull type) that
the coils and injector pairs get their power from so that they can be
disabled when working on the engine.
Another
"fishing trip" to ping the collective masses here.
A little background:
Typical "aircraft" key ignition switches for controlling magnetos
operate by grounding out the mag to "disable" it. The commonly seen
configuation is something that has OFF, L, R, BOTH and a START
position.. On the L setting for Left Magneto, the right mag is actually
grounded/disabled and vice versa for the R position. In addition, in
some installations, the switch also disables the right mag for starting
if the aircraft has a "retarded" mag on the left side.
I am curious about the following switch:
http://www.aircraftspruce.com/catalog/elpages/ignitionswitchkit.php
http://www.aircraftspruce.com/catalog/elpages/ignitionswitchkit.php
Wiring diagrams available at the link.
I am wondering if anyone has hands on experience with these sorts of
switches (from a wiring standpoint..
Does anyone know if this switch is reasonably/easily adaptable to
selecting individual coil banks such as for "trailing" and "leading"
when used in conjunction with an EC 2 setup?
Is the ground terminal on this switch connected to the entire switch
chassis or is it an isolated terminal ONLY used for grounding the mags
(and if its isolated, could it safely be used as a low current "HOT"
instead to power a coil relay? Or are there relays (which in turn
control the coil packs) that can be reasonably set to open/disconnect
when placed to ground? Or would having a relay with a ground trigger
result in undesireable current flow through the switch or relay? I
assume an Ignition Master switch to de-energize the whole thing would
be needed in that case
If useable, the implications would be great: A key switch for "security
appearance" (A.K.A.. the New Jersey dual lock rule). Key-cycled control
of both coils, AND a start switch all in one.
The only DISADVANTAGE that I see is the difficulty in cranking the
engine with the ignition OFF for whatever reason: preoiling, clearing a
flood, priming etc. I would assume that the COILS circuit breaker would
need to be pulled in that event.
Dave
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