Bill, I have the 8.5mm wires - seems like there was a reason (other than price, but too long ago to remember - perhaps I could only get different color boots on the 8.5)

 

Ed

 

 

From: Bill Bradburry

Sent: Sunday, January 13, 2013 12:47 PM

To: Rotary motors in aircraft

Subject: [FlyRotary] Re: Hiccup

Ed and John,

 

Do you guys have the 8.5 or the 10 MM thickness?  Does it matter?

 

Bill B

 

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From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ed Anderson
Sent: Sunday, January 13, 2013 7:14 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Hiccup

 

I agree with, John.  I had Magnacore make custom wires for my rotary - cost me around $45 back then.  Have flow for close to 10 years now with the wires with no problem.    I also had the boots in two different colors, one color for leading and one for trailing. 

 

Ed

 

From: John Slade

Sent: Saturday, January 12, 2013 7:31 PM

To: Rotary motors in aircraft

Subject: [FlyRotary] Re: Hiccup

 

I'd recommend paying the $85.  My magnacore custom made plug leads haven't given me a problem in 8 years.
Any way you can eliminate one possible cause is worth it. One nice thing about Magnacore is that they will make them to specified length with pre-installed connectors. I got mine in 2 colors. Red for leading, Black for trailing.

On 1/12/2013 3:18 PM, Bill Bradburry wrote:

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

 

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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

 

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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