X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 77 [XXX] (64%) PHISHING TRICK: url domain and visible domain text mismatch (36%) BODY: contains "rx" Return-Path: Received: from mail.fdic.gov ([167.176.6.5] verified) by logan.com (CommuniGate Pro SMTP 5.1.3) with ESMTPS id 1667340 for flyrotary@lancaironline.net; Tue, 12 Dec 2006 11:44:36 -0500 Received-SPF: pass receiver=logan.com; client-ip=167.176.6.5; envelope-from=brogers@fdic.gov DKIM-Signature: a=rsa-sha1; d=fdic.gov; s=fdic; c=simple; q=dns; t=1165941818; x=1166028218; h=from:date:subject:message-id:content-class:content-type; b=qV3hEmbq28VBoPrMmdPu08SOpcsnkBsylu93rpUQyZ5BifB+e+CtrzZmmOpBQ7TDWD/I9gb+1+xfZB3V13giBg== X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C71E0C.969A2333" Subject: RE: [FlyRotary] Re: MSD coils - Plug Fouling... again. Date: Tue, 12 Dec 2006 10:43:01 -0600 Message-ID: <15839C662A43B844B6E393DBFEAA90BF057AAA58@dalexc101p.prod.fdic.gov> In-Reply-To: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: MSD coils - Plug Fouling... again. thread-index: Accdezeo0SKupe/SQlGYSEV06vBIPgAj0G/w From: "Rogers, Bob J." To: "Rotary motors in aircraft" Return-Path: BRogers@FDIC.gov X-OriginalArrivalTime: 12 Dec 2006 16:43:15.0538 (UTC) FILETIME=[9EC32B20:01C71E0C] This is a multi-part message in MIME format. ------_=_NextPart_001_01C71E0C.969A2333 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable The iridium plugs seem like a great idea for longer life and better spark. I want to try them in my 13B Turbo engine. My current trailing plugs (BUR9EQ) get fouled quickly at engine speeds from idle to 3,000 rpm, but the leading plugs (BUR7EQ) do not foul. I was thinking that using the hotter leading plug in both holes would solve the problem. =20 I know that the factory specs call for a colder plug in the trailing position, but I speculate that the reason is because the trailing plug (in factory tune) fires later, after the mixture is already burning and things have heated up considerably in the combustion chamber. If we are using Tracy's EC2 ignition/fuel controller, which fires both plugs at the same time, maybe both plugs should have the same heat range. =20 Bob Rogers =20 ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Crook Sent: Monday, December 11, 2006 5:21 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: MSD coils - Plug Fouling... again. =20 Bob, I didn't even know there was a difference in length. They obviously work OK in the Renesis and since I used them in my 20B (with 13B turbo rotor housings) there does not seem to be a problem there either. The iridium plugs I used do not have the notched shell. They were pulled from early 2004 Renesis engines so I guess NGK made that change later. =20 I have never tried changing plug heat ranges since the standard plug recommended by Mazda has always worked OK for me. Flying at 7000 rpm (or less) is a lot different than racing at 9500 rpm of course. =20 Tracy (endless wiring of RV-8 panel) ----- Original Message -----=20 From: Rogers, Bob J. =20 To: Rotary motors in aircraft =20 Sent: Monday, December 11, 2006 3:59 PM Subject: [FlyRotary] Re: MSD coils - Plug Fouling... again. =20 Tracy,=20 =20 I noticed that the sparkplugs for the RX-8 (Renesis) engine have a longer reach for the leading plugs (21 mm) than for the trailing plugs (3/4 inch =3D19.05 mm). The earlier 13B engines all use a 3/4 inch = reach plug. See the attached web pages:=20 =20 http://www.ngkcom/results_app.asp?AAIA=3D1192340 =20 http://www.ngkcom/results_app.asp?AAIA=3D1431319 =20 =20 Does the longer reach of 21 mm create any problem for use in the older 13B engines? If one wanted to run a hotter plug in the trailing position, will the longer reach (and hotter) leading plug work in the trailing plug hole? =20 =20 =09 ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Crook Sent: Thursday, December 07, 2006 8:35 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: MSD coils - Plug Fouling... again. =20 . =20 I changed my plugs to iridium type (stock Renesis parts) about 210 hours ago and they have been wonderful. Never a hint of 'SAG' but I have run only a few tanks of 100LL during that time. =20 . ------_=_NextPart_001_01C71E0C.969A2333 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

The iridium plugs seem like a great = idea for longer life and better spark.  I want to try them in my 13B Turbo engine.  My current trailing plugs = (BUR9EQ) get fouled quickly at engine speeds from idle to 3,000 rpm, but the leading = plugs (BUR7EQ) do not foul.  I = was thinking that using the hotter leading plug in both holes would solve = the problem.

 

I know that the factory specs call = for a colder plug in the trailing position, but I speculate that the reason is because the trailing plug (in factory tune) fires later, after the = mixture is already burning and things have heated up considerably in the combustion chamber.  If we are using = Tracy’s = EC2 ignition/fuel controller, which fires both plugs at the same time, maybe = both plugs should have the same heat range.

 

Bob = Rogers

 

From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Crook
Sent: Monday, December = 11, 2006 5:21 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = MSD coils - Plug Fouling... again.

 

Bob,  I didn't even = know there was a difference in length.  They obviously work OK in the = Renesis and since I used them in my 20B (with 13B turbo rotor housings) there = does not seem to be a problem there either.   The iridium plugs I = used do not have the notched shell.  They were pulled from early 2004 = Renesis engines so I guess NGK made that change = later.

 

I have never tried = changing plug heat ranges since the standard plug recommended by Mazda has always = worked OK for me.  Flying at 7000 rpm (or less) is a lot different than = racing at 9500 rpm of course.

 

Tracy  (endless wiring of RV-8 panel)

----- Original Message ----- =

Sent: Monday, December 11, 2006 3:59 PM

Subject: [FlyRotary] Re: MSD coils - Plug Fouling... again.

 

Tracy,

 

I noticed that the sparkplugs for = the RX-8 (Renesis) engine have a longer reach for the leading plugs (21 mm) than = for the trailing plugs (3/4 inch =3D19.05 mm).  The earlier 13B engines all use a 3/4 inch reach plug.  See the attached web pages: =

 

http://www.ng= kcom/results_app.asp?AAIA=3D1192340

http://www.ng= kcom/results_app.asp?AAIA=3D1431319

 

Does the longer reach of 21 mm = create any problem for use in the older 13B engines?  If one wanted to run a hotter plug in the trailing position, will = the longer reach (and hotter) leading plug work in the trailing plug = hole?

 

 

From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Crook
Sent: Thursday, December = 07, 2006 8:35 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = MSD coils - Plug Fouling... again.

 

.<= /o:p>

 =

I changed my plugs to = iridium type (stock Renesis parts) about 210 hours ago and they have been = wonderful.  Never a hint of 'SAG' but I have run only a few tanks of 100LL during = that time.

 

.

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