X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.121] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2611342 for flyrotary@lancaironline.net; Sun, 23 Dec 2007 20:27:37 -0500 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.121; envelope-from=eanderson@carolina.rr.com Received: from edward2 ([24.74.103.61]) by cdptpa-omta02.mail.rr.com with SMTP id <20071224012658.DIZO14132.cdptpa-omta02.mail.rr.com@edward2> for ; Mon, 24 Dec 2007 01:26:58 +0000 Message-ID: <003201c845cc$2214e9e0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Spark Plugs Date: Sun, 23 Dec 2007 20:27:22 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002F_01C845A2.390A6460" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 This is a multi-part message in MIME format. ------=_NextPart_000_002F_01C845A2.390A6460 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Interesting, Al I use the stock plugs and after around 25-30 hours the ceramic cone of = mine are completely blackened by what appears to be lead deposits - you = recall I use 100LL. So your plugs still look better after 45 hours than = mine after 25. My understanding is Tracy gets close to 200 hours on a = set using primarily Mogas - so you may have considerably life in yours = yet. Ed ----- Original Message -----=20 From: Al Gietzen=20 To: Rotary motors in aircraft=20 Sent: Sunday, December 23, 2007 8:09 PM Subject: [FlyRotary] Spark Plugs I use the NGK B9EGV plugs in my 20B. I decided to pull a pair out for = a look after 45 hours. They seem pretty good, but perhaps not as good = as I expected since I've used nothing but 87 unleaded mogas. They give = quick starts, good performance, and are quite forgiving of flooded = conditions. I was surprised to see a bit of electrode erosion, but I = guess racing plugs with strong spark aren't expected to last like the = Champions in my car. The trailing is on the left in the photo, and has = an interesting 'shadow' going off to the right. I just though I'd post the photo for anyone's comment as this is my = first experience with these plugs in this engine for this many hours. = Some deposits on the leading - should I maybe consider a step toward a = higher heat range? Happy Holidays! Al -------------------------------------------------------------------------= ----- -- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html ------=_NextPart_000_002F_01C845A2.390A6460 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Interesting, Al
 
I use the stock plugs and after around 25-30 = hours the=20 ceramic cone of mine are completely blackened by what appears to be lead = deposits - you recall I use 100LL.  So your plugs still look better = after=20 45 hours than mine after 25.  My understanding is Tracy gets close = to 200=20 hours on a set using primarily Mogas - so you may have considerably life = in=20 yours yet.
 
Ed
----- Original Message -----
From:=20 Al = Gietzen=20
Sent: Sunday, December 23, 2007 = 8:09=20 PM
Subject: [FlyRotary] Spark = Plugs

I use the NGK B9EGV = plugs in my=20 20B.  I decided to pull a pair out for a look after 45 = hours.  They=20 seem pretty good, but perhaps not as good as I expected since I=92ve = used=20 nothing but 87 unleaded mogas.  They give quick starts, good = performance,=20 and are quite forgiving of flooded conditions.  I was surprised = to see a=20 bit of electrode erosion, but I guess racing plugs with strong spark = aren=92t=20 expected to last like the Champions in my car. The trailing is on the = left in=20 the photo, and has an interesting =91shadow=92 going off to the=20 right.

 

I just though I=92d = post the photo=20 for anyone=92s comment as this is my first experience with these plugs = in this=20 engine for this many hours.  Some deposits on the leading - = should I=20 maybe consider a step toward a higher heat range?

 

Happy=20 Holidays!

 

Al

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Homepage:  http://www.flyrotary.com/
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