X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 20 Feb 2012 14:37:28 -0500 Message-ID: X-Original-Return-Path: Received: from raven.ravenwebhosting.com ([72.9.254.67] verified) by logan.com (CommuniGate Pro SMTP 5.4.4) with ESMTPS id 5406570 for lml@lancaironline.net; Mon, 20 Feb 2012 12:41:05 -0500 Received-SPF: none receiver=logan.com; client-ip=72.9.254.67; envelope-from=paul@tbm700.com Received: from 103-57.202-68.tampabay.res.rr.com ([68.202.57.103]:53932 helo=[192.168.15.107]) by raven.ravenwebhosting.com with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.69) (envelope-from ) id 1RzXDw-0001o2-OL for lml@lancaironline.net; Mon, 20 Feb 2012 12:40:28 -0500 From: paul miller Mime-Version: 1.0 (Apple Message framework v1084) Content-Type: multipart/alternative; boundary=Apple-Mail-7--734892119 Subject: Re: [LML] Re: Fine wire vs regular spark plugs X-Original-Date: Mon, 20 Feb 2012 12:40:25 -0500 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: <1866835D-28EC-43AF-A1F5-FFC20A427B3C@tbm700.com> X-Mailer: Apple Mail (2.1084) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - raven.ravenwebhosting.com X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - tbm700.com X-Source: X-Source-Args: X-Source-Dir: --Apple-Mail-7--734892119 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 The slide was clearly "LOP" and I got the impression they are savvy = enough to understand the difference you mentioned below. I just did not = have time to address the issue with them, but I have his card so I'll = ask what Tempest means. Paul Miller On 2012-02-20, at 11:32 AM, Craig Berland. wrote: > =93There was one slide that showed a badly eroded massive and it was = blamed on "severe LOP operation=94 > Let me take a stab at this. I suspect what they said or at least = meant was, the badly eroded electrode was caused by severe detonation as = a result of lean operation. What I mean is, if you are at high power = and 300-400 degF Rich of Peak and you lean to 50degF Rich of Peak, you = are in what I would call a severe engine operation zone caused by = leaning. That is, you are way too lean for Rich of Peak operation at = high power. If you continue leaning to 60-100 degF Lean of Peak, you = are what I would call a pilot with good engine mangagement skills. By = continuing the leaning process you reduce peak cylinder pressures and = therefore peak temperatures. The likelihood of detonation increases as = temperature and pressure increase. By leaning to 60-100 degF LOP, you = significantly reduce the likelihood of detonation from the 50 degF ROP = setting. > Craig Berland > N7VG > =20 > =20 > As a matter of interest, Tempest made a presentation to our EAA = meeting last night and they had a lot of good technical info, most of = which backs up what we've been saying here: > =20 > 1) Massives typically good for 500 hours, fine wire 1800 hours. > 2) Iridium replaced platinum because of leaded fuel issues > 3) Resistance should max out at 5000 ohms then replace plug. = Champion has that problem and Tempest created their own "fired in" = solution made by Honeywell that the company says solves the problem. = The resistor is not there for radio interference but for capacitance = reasons. =20 > 4) Dropping a plug is replacing that plug--no questions. > 5) Gaps on massives can be closed, never opened because it cracks = insulators. > 6) Rotating plugs has real benefits and the rotation is listed on the = Tempest website. > =20 > There was one slide that showed a badly eroded massive and it was = blamed on "severe LOP operation". I have trouble understanding this = link but maybe there's data to support it. > =20 > There was quite a bit of information given with good slides. If = anyone wants a presentation for their group, it is worthwhile and a lot = of data is on the tempest website. > =20 > Paul=20 > Spruce Creek > Legacy RG > =20 > =20 --Apple-Mail-7--734892119 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252 The = slide was clearly "LOP" and I got the impression they are savvy enough = to understand the difference you mentioned below.  I just did not = have time to address the issue with them, but I have his card so I'll = ask what Tempest means.

Paul Miller
On = 2012-02-20, at 11:32 AM, Craig Berland. wrote:

=93There was one slide that showed a badly = eroded massive and it was blamed on "severe LOP = operation=94
Let = me take a stab at this.  I suspect what they said or at least meant = was, the badly eroded electrode was caused by severe detonation as a = result of lean operation.  What I mean is, if you are at high power = and 300-400 degF Rich of Peak and you lean to 50degF Rich of Peak, you = are in what I would call a severe engine operation zone caused by = leaning. That is, you are way too lean for Rich of Peak operation at = high power.  If you continue leaning to 60-100 degF Lean of Peak, = you are what I would call a pilot with good engine mangagement = skills.  By continuing the leaning process you reduce peak cylinder = pressures and therefore peak temperatures.  The likelihood of = detonation increases as temperature and pressure increase.  By = leaning to 60-100 degF LOP, you significantly reduce the likelihood of = detonation from the 50 degF ROP setting.
Craig = Berland
As a matter of interest, = Tempest made a presentation to our EAA meeting last night and they had a = lot of good technical info, most of which backs up what we've been = saying here:
1) Massives typically = good for 500 hours, fine wire 1800 = hours.
2) Iridium replaced = platinum because of leaded fuel issues
3) Resistance should max out at 5000 ohms then replace = plug.    Champion has that problem and Tempest created their = own "fired in" solution made by Honeywell that the company says solves = the problem.  The resistor is not there for radio interference but = for capacitance reasons.   
4) Dropping a plug is replacing that plug--no = questions.
5) Gaps on massives can = be closed, never opened because it cracks = insulators.
6) Rotating plugs has = real benefits and the rotation is listed on the Tempest = website.
There was one slide that = showed a badly eroded massive and it was blamed on "severe LOP = operation".  I have trouble understanding this link but maybe = there's data to support it.
 
There was quite a bit of information given with good = slides.   If anyone wants a presentation for their group, it is = worthwhile and a lot of data is on the tempest = website.
Spruce = Creek
Legacy = RG