X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from aspensprings.uwyo.edu ([129.72.10.32] verified) by logan.com (CommuniGate Pro SMTP 6.0.1) with ESMTPS id 6009157 for flyrotary@lancaironline.net; Sat, 12 Jan 2013 13:30:23 -0500 Received-SPF: none receiver=logan.com; client-ip=129.72.10.32; envelope-from=SBoese@uwyo.edu Received: from ponyexpress-ht4.uwyo.edu (extlb.uwyo.edu [172.26.4.4]) by aspensprings.uwyo.edu (8.14.4/8.14.4) with ESMTP id r0CITkJj015947 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for ; Sat, 12 Jan 2013 11:29:46 -0700 (MST) (envelope-from SBoese@uwyo.edu) Received: from ponyexpress-hb1.uwyo.edu (10.84.66.35) by ponyexpress-ht4.uwyo.edu (10.84.66.27) with Microsoft SMTP Server (TLS) id 14.2.318.1; Sat, 12 Jan 2013 11:29:46 -0700 Received: from ponyexpress-m10.uwyo.edu ([fe80::60dd:cb9e:6f71:3d48]) by ponyexpress-hb1.uwyo.edu ([fe80::bc1d:430c:f399:767d%13]) with mapi id 14.02.0318.004; Sat, 12 Jan 2013 11:29:45 -0700 From: "Steven W. Boese" To: Rotary motors in aircraft Subject: RE: [FlyRotary] Re: Hiccup Thread-Topic: [FlyRotary] Re: Hiccup Thread-Index: AQHN8NY6Zcs/nrJxFUiZPfGNRRgzuJhF/xdC Date: Sat, 12 Jan 2013 18:29:45 +0000 Message-ID: <3E8191F276108F4481AB0721BBA9269E05ED5FBF@ponyexpress-m10.uwyo.edu> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [75.220.132.32] Content-Type: multipart/alternative; boundary="_000_3E8191F276108F4481AB0721BBA9269E05ED5FBFponyexpressm10u_" MIME-Version: 1.0 --_000_3E8191F276108F4481AB0721BBA9269E05ED5FBFponyexpressm10u_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I had an aftermarket tachometer on my engine test stand that would often re= ad 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 spa= rk 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 cou= rse 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 w= ires with Magnecore wires from the installation in my plane cured the tach = errors. Now, however, checking the ignition timing with an inductive timin= g light pickup on these wires was difficult whereas it was not a problem wi= th the original wires. It should be noted that the EC2 on the engine stand never gave any indicati= on 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. B= ut it was electrically noisy. So it got replaced by carbon impregnated fab= ric, 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, closel= y 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 off= er a similar product now. According to some sources, the core material can= make a large difference in the inductive effectiveness. Therefore, I'd re= commend 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 t= he 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 --_000_3E8191F276108F4481AB0721BBA9269E05ED5FBFponyexpressm10u_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

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 p= ower to each of the four ignition coils could be controlled independently.&= nbsp; The spark plug wires were Mazda OEM.  The behavior of the tach would sometimes be affected by the co= mbination of ignition coils that were active.  In the course of troubl= eshooting, it was found that the tach would consistently read t= wice 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&n= bsp;doubled rpm indication was due to triggering by the ignition signa= ls from both rotors.  Replacing the Mazda spark plug wires with Magnecore wires from the installation in my plane c= ured the tach errors.  Now, however, checking the ign= ition 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 ga= ve any indication of having problems when either set of spark plug wir= es was installed in spite of being physically located closer to the coils a= nd 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 spa= rk wire was just that: wire.  But it was electrically noisy.  So = it got replaced by carbon impregnated fabric, which has rather high resista= nce (a cheap way to damp the "noise").

Another way to suppress the "noise" is to wrap the wire (many tur= ns, closely spaced) around an insulating core, which creates an inductive i= mpedance, 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.  Acco= rding to some sources, the core material can make a large difference in the= inductive effectiveness.  Therefore, I'd recommend
MAGNECORE.
 
--=20
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 origina= l Mazda wires.  I checked them out yesterday and they seemed fine, but I am still considering replacing them to see if it h= elps.

&= nbsp;

Bill B



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