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The Magnacore wires are fairly pricey,
about $85 for the RX-8. Not that I am cheap or anything, but does anyone have a
more economical source??
Bill B
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Steven W. Boese
Sent: Saturday, January 12, 2013
1:30 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Hiccup
I had an aftermarket tachometer on my engine
test stand that would often read twice the actual rpm. The engine stand
was set up so that the power to each of the four ignition coils could be
controlled independently. The spark plug wires were Mazda OEM. The
behavior of the tach would sometimes be affected by the combination of
ignition coils that were active. In the course of troubleshooting, it was
found that the tach would consistently read twice the actual RPM when its
input wire was completely disconnected at the tach. It was concluded that
the tach was responding to signals emitted by the spark plug wires and
the doubled rpm indication was due to triggering by the ignition
signals from both rotors. Replacing the Mazda spark plug wires
with Magnecore wires from the installation in my plane cured the tach
errors. Now, however, checking the ignition timing with an inductive
timing light pickup on these wires was difficult whereas it was not a
problem with the original wires.
It should be noted that the EC2 on the
engine stand never gave any indication of having problems when either set
of spark plug wires was installed in spite of being physically located closer
to the coils and spark plug wires relative to the tach.
Steve Boese
RV6A, 1986 13B NA, RD1A, EC2
From: Rotary
motors in aircraft [flyrotary@lancaironline.net] on behalf of
Dale_R [dale.rog@gmail.com]
Sent: Saturday, January 12, 2013
8:04 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Hiccup
Dunno how many people here remember when
spark wire was just that: wire. But it was electrically noisy. So
it got replaced by carbon impregnated fabric, which has rather high resistance
(a cheap way to damp the "noise").
Another way to suppress the "noise" is to wrap the wire (many turns,
closely spaced) around an insulating core, which creates an inductive
impedance, which accomplishes the same goal but readily passes spark
current. AFAIK, "MAGNECORE" was the first to explore this
method, but several companies offer a similar product now. According to
some sources, the core material can make a large difference in the inductive
effectiveness. Therefore, I'd recommend
MAGNECORE.
-- Best Regards, Dale_R (who has no financial interest in Magnecore) Cozy MKIV #497
On 1/12/2013 7:21 AM, Bill Bradburry wrote:
Anybody have a recommendation for ignition
wires for the Renesis? I have the original Mazda wires. I checked
them out yesterday and they seemed fine, but I am still considering replacing
them to see if it helps.
Bill B
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