X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-ww0-f50.google.com ([74.125.82.50] verified) by logan.com (CommuniGate Pro SMTP 5.3.11) with ESMTP id 4664693 for flyrotary@lancaironline.net; Wed, 05 Jan 2011 09:34:39 -0500 Received-SPF: pass receiver=logan.com; client-ip=74.125.82.50; envelope-from=rwstracy@gmail.com Received: by wwf26 with SMTP id 26so15271161wwf.7 for ; Wed, 05 Jan 2011 06:34:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:sender:received :in-reply-to:references:date:x-google-sender-auth:message-id:subject :from:to:content-type; bh=bJjwxjlUedrS1hLhc8xsqA6UzSgahs0CEt0iODJnJuA=; b=qSlQqxFN+wyM6lmkcU9m0PBQ6aeXPWfDPGhCB2WyoG8khRgcKexJSnUgltvTnvjIh1 PA5AtbYlqSwAAx2awMBXKC8lwqtFa+4FdlRaAP/IV5xLZVGlgMmX4l8CQIUEW7GVW1Q5 g3c/oYdrHXtPD8MVbJBVKh1La98R1jakIMKQw= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:content-type; b=TpGylNBaEaH9tvWHX2LA6IHFB5JIA28SdLhFujFlTWhk2FXidGaMB9DbjhTdofoLM3 WGinbQOvI1JvuzPCEvnTcVNmXtCgFPyW61cnFo27zzqNCbuy999qFksujBGGmaufi4Nw f3pUfq/2V8D6m+VODUpPiW/wvawieh/4Oo0r4= MIME-Version: 1.0 Received: by 10.216.187.133 with SMTP id y5mr3109008wem.110.1294235103763; Wed, 05 Jan 2011 05:45:03 -0800 (PST) Sender: rwstracy@gmail.com Received: by 10.216.200.158 with HTTP; Wed, 5 Jan 2011 05:45:03 -0800 (PST) In-Reply-To: References: Date: Wed, 5 Jan 2011 08:45:03 -0500 X-Google-Sender-Auth: U7KxaONFzGPXWZQh8o_zCcszKfI Message-ID: Subject: Re: [FlyRotary] Re: GM Coil Comparison From: Tracy To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0016365ee7249d9d7f0499199781 --0016365ee7249d9d7f0499199781 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Good question. I've seen no indication that more is better as long as you have enough. I did test that MSD brand LS-1 coil and it worked great but saw no evidence that it gave more power or longer plug life. A friend of mine once compared it to starting a forest fire. Doesn't matter whether yo= u do it with a match or a blow torch - result is the same. The spark from those Ducati ignition systems on Rotax 582's is a good example. Unless you stick the plug gap into a dark hole you can't see it. I'm sure things get more critical as you push the power limits of the engine. We aren't doing that though. BTW, the stock 2nd gen coils give as big & hot a spark as I've seen. I'd still be using them if they weren't so darn heavy. On plug life - I have over 300 hours on RX-8 Iridium plugs running almost all mogas. I made one long flight at around 200 hrs on 100LL and started getting SAG after about 2 flight hours. Here's the confusing part, after going back to mogas for an hour or so the plugs started working fine again. I have no idea what that means. Tracy On Wed, Jan 5, 2011 at 1:13 AM, Al Gietzen wrote: > So I=92m still waiting for an answer to the question I posed a few day= s > back. Do we have any real evidence that the higher current spark is neede= d > in our application; or is going to result in any better performance? > > > > Perhaps it=92s obvious to someone, but I=92m wondering whether it compara= ble to > watts/channel on a stereo. 50 per channel into good speakers is enough to > drive you out of your home; but the salesperson will try to convince you > that 1000 watts must be 10 times better. The D580 certainly makes a very > good spark, which ignites the mixture just fine. Once the arc is made an= d > the fuel molecules are burning, does 120 ma spark give you anything that = a > 60 ma spark doesn=92t if the voltage is the same? Presumably it is just = a > matter of spark duration. > > > > Save me the need to do some researchJ > > > > Al > --0016365ee7249d9d7f0499199781 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Good question.=A0 I've seen no indication that more is better as long a= s you have enough.=A0 I did test that MSD brand LS-1 coil and it worked gre= at but saw no evidence that it gave more power or longer plug life.=A0 A fr= iend of mine once compared it to starting a forest fire.=A0 Doesn't mat= ter whether you do it with a match or a blow torch - result is the same.=A0= The spark from those Ducati ignition systems on Rotax 582's is a good = example.=A0 Unless you stick the plug gap into a dark hole you can't se= e it.=A0 I'm sure things get more critical as you push the power limits= of the engine.=A0 We aren't doing that though.

BTW, the stock 2nd gen coils give as big & hot a spark as I've = seen.=A0 I'd still be using them if they weren't so darn heavy.
=
On plug life -=A0=A0 I have over 300 hours on RX-8 Iridium plugs runnin= g almost all mogas.=A0 I made one long flight at around 200 hrs on 100LL an= d started getting SAG after about 2 flight hours.=A0 Here's the confusi= ng part,=A0 after going back to mogas for an hour or so the plugs started w= orking fine again.=A0 I have no idea what that means.

Tracy

On Wed, Jan 5, 2011 at 1:13 AM,= Al Gietzen <ALV= entures@cox.net> wrote:

So I=92m s= till waiting for an answer to the question I posed a few days back. Do we have any real evidence that = the higher current spark is needed in our application; or is going to result in= any better performance?

=A0=

Perhaps it= =92s obvious to someone, but I=92m wondering whether it comparable to watts/channel on a stereo. 50 per channel into good speakers is enough to drive you out of your home; but= the salesperson will try to convince you that 1000 watts must be 10 times bette= r. =A0The D580 certainly makes a very good spark, which ignites the mixture just fine= . =A0Once the arc is made and the fuel molecules are burning, does 120 ma spark give = you anything that a 60 ma spark doesn=92t if the voltage is the <= font color=3D"blue" face=3D"Verdana" size=3D"2">same?=A0 Presumably it is just a matter of spark duration.

=A0=

Save me th= e need to do some researchJ

=A0=

Al<= /font>


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