X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from zproxy.gmail.com ([64.233.162.205] verified) by logan.com (CommuniGate Pro SMTP 5.0.6) with ESMTP id 932033 for flyrotary@lancaironline.net; Wed, 18 Jan 2006 18:21:56 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.233.162.205; envelope-from=wdleonard@gmail.com Received: by zproxy.gmail.com with SMTP id k1so76961nzf for ; Wed, 18 Jan 2006 15:21:12 -0800 (PST) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; b=fDL9DQc0btWkqeTqjTaRRt3nLHuZ8rh+kdJsPFNVIukGpNKY4G2ojBnfGjmGyccKeT+FlhfGZZfojpSV2wJYgMJz0zHT68OwQtKUIO45vMBxiDAdTRMx05H4Ze74Oy+z+D5ekKnb/Rvm25PDs6dIlWUuldBbUK+2GxWQQn9zC5Q= Received: by 10.65.218.4 with SMTP id v4mr5285817qbq; Wed, 18 Jan 2006 15:21:12 -0800 (PST) Received: by 10.64.142.19 with HTTP; Wed, 18 Jan 2006 15:21:12 -0800 (PST) Message-ID: <1c23473f0601181521i6ffb7c96k1ad3fccafe68f749@mail.gmail.com> Date: Wed, 18 Jan 2006 15:21:12 -0800 From: David Leonard To: Rotary motors in aircraft Subject: Re: [FlyRotary] Fw: [FlyRotary] Re: LS1 Coil Failures In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_21659_3453681.1137626472337" References: ------=_Part_21659_3453681.1137626472337 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline I prefer easy math (can fit in one line): Rotary: 1 spark/plug/revolution, 1:1 spark plug:coil, at 8000 RPM=3D 8000 spark/min/coil Car: .5 spark/plug/revolution, 8:1 spark plug:coil, at 4000 RPM=3D 16000 spark/min/coil So the rotary in our application has half the duty cycle on the coils for equivalent engine work loads. I think maybe some cars have 2 coils, which would make the rotary at 8000 rpm the same duty cycle on the coils as the car at 4000 rpm. Did someone already say that? Dave Leonard On 1/18/06, Ed Anderson wrote: > > > ----- Original Message ----- *From:* Ed Anderson > *To:* Rotary motors in aircraft > *Sent:* Wednesday, January 18, 2006 5:01 PM > *Subject:* Re: [FlyRotary] Re: LS1 Coil Failures > > > Cause still to be resolved, Bob. Too soon to worry, but, if truly a > problem better to find it now than at 2000 MSL on some take off down the > road. Although with 6 (20B I presume) you can stand a coil failure a bit > better than us two rotor. > > Ed A > > > ----- Original Message ----- > *From:* bmears9413@aol.com > *To:* Rotary motors in aircraft > *Sent:* Wednesday, January 18, 2006 3:44 PM > *Subject:* [FlyRotary] Re: LS1 Coil Failures > > > Plus I really hate reading all this about the LS1 coils....I just > purchased 6 yesterday. > > Bob Mears > > -----Original Message----- > From: Mark R Steitle > To: Rotary motors in aircraft > Sent: Wed, 18 Jan 2006 14:24:20 -0600 > Subject: [FlyRotary] Re: LS1 Coil Failures > > Bill, > I feel it is a fair assumption that the LS1 coil was never intended to ru= n > at 12,000 rpm, as would be the equivalent of what we?re doing with the > rotary at 6,000 rpm. So, we?re clearly operating it outside the design > range. Does this shorten their life? Don?t know, but Tracy?s experience > seems to indicate this could be the case. Couple this with other extreme= s, > such as temperature and frequency and they might not be up to the task. > > The coils on my 126,000 mile LS1 truck are all factory stock. No failure= s > (knock on wood). > > Mark S. > > ------------------------------ > *From:* Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] *= On > Behalf Of *wrjjrs@aol.com > *Sent:* Wednesday, January 18, 2006 1:27 PM > *To:* Rotary motors in aircraft > *Subject:* [FlyRotary] Re: LS1 Coil Failures > > Mark, > There may well be a duty cycle problem, but I doubt it. Older ignitions > used a single coil of similar type firing all 8 cylinders. I would be mor= e > likely to suggest it was a "bathtub failure curve" failure of the solid > state "trigger" circuit. > Bill Jepson > > -----Original Message----- > From: Mark R Steitle > To: Rotary motors in aircraft > Sent: Wed, 18 Jan 2006 10:51:47 -0600 > Subject: [FlyRotary] Re: LS1 Coil Failures > Sorry, that's what I get for doing "head math". Anyway, my point is > still valid. It fires 8 times more often in the rotary than in the > truck/auto. Could the duty-cycle be the culprit? It would be interestin= g > to see the specs on these coils. > > Mark S. > > > > -- Dave Leonard Turbo Rotary RV-6 N4VY http://members.aol.com/_ht_a/rotaryroster/index.html http://members.aol.com/_ht_a/vp4skydoc/index.html ------=_Part_21659_3453681.1137626472337 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline
I prefer easy math (can fit in one line):
 
Rotary: 1 spark/plug/revolution, 1:1 spark plug:coil,  at 8000 RP= M=3D  8000 spark/min/coil
Car: .5 spark/plug/revolution, 8:1 spark plug:coil, at 4000 RPM=3D 160= 00 spark/min/coil
 
So the rotary in our application has half the duty cycle on the coils = for equivalent engine work loads.  I think maybe some cars have 2 coil= s, which would make the rotary at 8000 rpm the same duty cycle on the coils= as the car at 4000 rpm.
 
Did someone already say that?
 
Dave Leonard

 
On 1/18/06, = Ed Anderson <eanderson@= carolina.rr.com> wrote:
 
----- Original Message --= ---=20
From: Ed Anderson
Sent: Wednesday, January 18, 2006 5:01 PM
Subject: Re: [FlyRotary] Re: LS1 Coil Failures

 
Cause still to be resolved, Bob.  Too soon t= o worry, but, if truly a problem better to find it now than at 2000 MSL on = some take off down the road.  Although with 6 (20B I presume) you can = stand a coil failure a bit better than us two rotor.
 
Ed A
 
----- Original Message -----
Sent: Wednesday, January 18, 2006 3:= 44 PM
Subject: [FlyRotary] Re: LS1 Coil Fa= ilures

 
Plus I really hate reading all this about the LS1 coils....I just purc= hased 6 yesterday.
 
Bob Mears 
 
-----Original Message-----
From: Mar= k R Steitle <mark.stei= tle@austin.utexas.edu >
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Wed, 18 Jan = 2006 14:24:20 -0600
Subject: [FlyRotary] Re: LS1 Coil Failures
=
Bill,
I feel it is a fair assumption th= at the LS1 coil was never intended to run at 12,000 rpm, as would be the eq= uivalent of what we?re doing with the rotary at 6,000 rpm.  So, we?re = clearly operating it outside the design range.  Does this shorten thei= r life?  Don?t know, but Tracy?s experience seems to indicate this cou= ld be the case.  Couple this with other extremes, such as temperature = and frequency and they might not be up to the task. =20
 
The coils on my 126,000 mile LS1 = truck are all factory stock.  No failures (knock on wood).
 
Mark S. 
 
From: Ro= tary motors in aircraft [mailto: flyrotary@lancaironline.net<= /a>] On Behalf Of wrjjrs@aol.com
Sent:= Wednesday, January 18, 2006 1:27 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: LS1 Coil Failures<= /div>
 
 Mark,
There may well be a duty cycle problem, but I doubt it. O= lder ignitions used a single coil of similar type firing all 8 cylinders. I= would be more likely to suggest it was a "bathtub failure curve"= failure of the solid state "trigger" circuit.
Bill Jepson

-----= Original Message-----
From: Mark R Steitle < mark.steitle@austin.utexas.edu>
To: Rota= ry motors in aircraft <fl= yrotary@lancaironline.net >
Sent: Wed, 18 Jan 2006 10:51:47 -0600
Subject: [FlyRotary] Re: LS1 Coil Failures
Sorry, that's what I get for doin= g "head math".  Anyway, my point is still valid.  It fi= res 8 times more often in the rotary than in the truck/auto.  Could th= e duty-cycle be the culprit?  It would be interesting to see the specs= on these coils.
 
Mark S.
 
 
<= /div>



= --
Dave Leonard
Turbo Rotary RV-6 N4VY
http://members.aol.com/_ht_a/rotaryroster/index.html
http://m= embers.aol.com/_ht_a/vp4skydoc/index.html =20 ------=_Part_21659_3453681.1137626472337--