X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.102] (HELO ms-smtp-03-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 5.0.6) with ESMTP id 933601 for flyrotary@lancaironline.net; Thu, 19 Jan 2006 19:50:50 -0500 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.102; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-025-165.carolina.res.rr.com [24.74.25.165]) by ms-smtp-03-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id k0K0nwfW000154 for ; Thu, 19 Jan 2006 19:49:59 -0500 (EST) Message-ID: <003901c61d5b$77a29150$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Spark Plug Fouling Date: Thu, 19 Jan 2006 19:50:10 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0036_01C61D31.8E980BD0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0036_01C61D31.8E980BD0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I thought it was interesting also. But, it could explain why I don't = seem to hear as much complaint from the Lycoming guys about lead = fouling. Ed ----- Original Message -----=20 From: wrjjrs@aol.com=20 To: Rotary motors in aircraft=20 Sent: Thursday, January 19, 2006 3:56 PM Subject: [FlyRotary] Re: Spark Plug Fouling Ed, That is very useful information. On our water cooled engines the only = time we'll see 350=B0 is just before the engine siezes! Bill Jepson=20 =20 -----Original Message----- From: Ed Anderson To: Rotary motors in aircraft Sent: Thu, 19 Jan 2006 12:54:32 -0500 Subject: [FlyRotary] Spark Plug Fouling I believe that most of us understood that leaded gasoline can lead to = spark plug fouling. It turns out even with the "Scavenger" compounds = it apparently will still happened. See article below: I also read one report that address aircraft engine effect. It = basically said that if the CHT is not kept over 350F the scavenger = effectiveness is minimal. So this may be why aircraft sparkplugs do not = seem to foul as often as the auto plugs (higher CHT). =20 URL :http://www.petroleumbazaar.com/MS/msappli2.htm During combustion TEL (Tetraethyl lead ) forms an oxide of lead which = is not volatile and so should tend to deposit on the combustion chamber, = valves, spark plugs, etc. with harmful effects. To counteract this. = "Scavenger" compounds, such as ethylene dibromide and ethylene = dichloride, are mixed with TEL so that on combustion more volatile = compounds of lead are formed, resulting in most of the metal passing out = with exhaust gas. The TEL together with the scavengers and a dye to = indicate the poisonous nature of the compound is known as "ethyl fluid". = Despite the use of decavenger compounds, it can give rise to such = difficulties as: sparkplug fouling, surface ignition, exhaust valve = failure and octane requirement increase. Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com ------=_NextPart_000_0036_01C61D31.8E980BD0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I thought it was interesting also.  But, it = could=20 explain why I don't seem to hear as much complaint from the Lycoming = guys about=20 lead fouling.
 
Ed
----- Original Message -----
From:=20 wrjjrs@aol.com
Sent: Thursday, January 19, = 2006 3:56=20 PM
Subject: [FlyRotary] Re: Spark = Plug=20 Fouling

Ed,
That is very useful information. On our water cooled engines the = only=20 time we'll see 350=B0 is just before the engine siezes!
Bill Jepson 
 
-----Original = Message-----
From: Ed=20 Anderson <eanderson@carolina.rr.com&g= t;
To:=20 Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent:=20 Thu, 19 Jan 2006 12:54:32 -0500
Subject: [FlyRotary] Spark Plug=20 Fouling

I believe that most of us understood that = leaded=20 gasoline can lead to spark plug fouling.   It turns out even = with=20 the "Scavenger" compounds it apparently will still happened.  See = article=20 below:
 
I also read one report that address aircraft = engine=20 effect.  It basically said that if the CHT is not kept over 350F = the=20 scavenger effectiveness is minimal.  So this may be why aircraft=20 sparkplugs do not seem to foul as often as the auto plugs (higher = CHT). =20
 
 
URL=20 :http://www.petroleumbazaar.com/MS/msappli2.htm
 
 
During combustion TEL (Tetraethyl=20 lead ) forms an oxide of lead which is not volatile and so = should=20 tend to deposit on the combustion chamber, valves, spark plugs, etc. = with=20 harmful effects. To counteract this. "Scavenger" compounds, such as = ethylene=20 dibromide and ethylene dichloride, are mixed with TEL so that on = combustion=20 more volatile compounds of lead are formed, resulting in most of the = metal=20 passing out with exhaust gas. The = TEL together=20 with the scavengers and a dye to indicate the poisonous nature of the = compound=20 is known as "ethyl fluid".
 
 
Despite the use of decavenger = compounds, it can=20 give rise to such difficulties as: sparkplug fouling, surface = ignition,=20 exhaust valve failure and octane requirement increase.
 
 
Ed Anderson
Rv-6A N494BW Rotary = Powered
Matthews,=20 NC
eander= son@carolina.rr.com
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