X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.100] (HELO ms-smtp-01-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 5.0.6) with ESMTP id 932009 for flyrotary@lancaironline.net; Wed, 18 Jan 2006 17:59:04 -0500 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.100; 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-01-eri0.southeast.rr.com (8.13.4/8.13.4) with SMTP id k0IMwGFH001965 for ; Wed, 18 Jan 2006 17:58:18 -0500 (EST) Message-ID: <000701c61c82$b1395a90$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" Subject: Fw: 100 vs 600 vs 400 vs 12.5 sparks/second : LS1 Coil Failures Date: Wed, 18 Jan 2006 17:58:26 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0004_01C61C58.C7E2B0E0" 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_0004_01C61C58.C7E2B0E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ----- Original Message -----=20 From: Ed Anderson=20 To: Rotary motors in aircraft=20 Sent: Wednesday, January 18, 2006 4:55 PM Subject: 100 vs 600 vs 400 vs 12.5 sparks/second : LS1 Coil Failures True, but remember we have two rotors each having two spark plugs (both = of which fire) and the trailing coils throw one spark away (waste spark) = but still is a coil firing. The rotors are turning 2000 rpm (6000 rpm shaft / 3 ), each rotor fires = 3 times for each rotor revolution (three faces per rotor). 2000/60 =3D = 33.33 revs/sec for the rotors.=20 There are 2 rotor with 3 faces each or 6 firing faces per revolution or = 33.33*6 =3D 200 ignition evens per second. But each rotor has 2 spark = plugs both of which fire for each ignition event, so we have 33.33 * 6 = * 2 =3D 400 sparks second.=20 But, each sparkplug is serviced by a separate ignition module so 400/2 = =3D 200 sparks/second per ignition module - still up there compared to = a reciprocating engine. Now at Tracy's 7500 rpm {:>), we have 7500/3 =3D 2500 rotor rpm or = 2500/60 =3D 41.66 revs/second. From which we have 41.66*6*2 =3D 500 = sparks per second. Now since there is a LS1 coil for each plug we can = divide load by 4 and 500/4 =3D 125 sparks second.=20 so If my logic and math are correct, Tracy is actually driving the = coils less that the Mazda stock coils - but still way above Mark's truck = at 12.5 sparks/second. In fact about 10 times more than Mark's truck = with engine turning 1500 rpm. FWIW Ed ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Wednesday, January 18, 2006 11:47 AM Subject: [FlyRotary] Re: LS1 Coil Failures Each rotor fires once/revolution of the eccentric shaft. Cruising = along at 6000rpm, that's 600 sparks/second/coil. =20 Hi Mark, Is this the new math I always heard about :-) =20 6000 rpm / 60 seconds =3D 100 sparks per second Cheers, Rusty (everyone's a critic ) ------=_NextPart_000_0004_01C61C58.C7E2B0E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

----- Original Message -----=20

From: Ed=20 Anderson

To: Rotary motors in = aircraft

Sent: Wednesday, January 18, 2006 4:55 PM

Subject: 100 vs 600 vs 400 vs 12.5 sparks/second : LS1 Coil=20 Failures

True, but remember we have two rotors each = having two=20 spark plugs (both of which fire) and the trailing coils throw one spark = away=20 (waste spark) but still is a coil firing.

The rotors are turning 2000 rpm (6000 rpm shaft = / 3 ),=20 each rotor fires 3 times for each rotor revolution (three faces per=20 rotor). 2000/60 =3D 33.33 revs/sec for the rotors.

There are 2 rotor with 3 faces each or 6 firing = faces per=20 revolution or 33.33*6 =3D 200 ignition evens per second. But each = rotor=20 has 2 spark plugs both of which fire for each ignition event, = so we=20 have 33.33 * 6 * 2 =3D 400 sparks second.

But, each sparkplug is serviced by a = separate=20 ignition module so 400/2 =3D 200 sparks/second per ignition module = - still=20 up there compared to a reciprocating engine.

Now at Tracy's 7500 rpm {:>), we have 7500/3 = =3D 2500=20 rotor rpm or 2500/60 =3D 41.66 revs/second. From which we = have=20 41.66*6*2 =3D 500 sparks per second. Now since there is a LS1 coil = for each=20 plug we can divide load by 4 and 500/4 =3D 125 sparks = second.

so If my logic and math are correct, Tracy = is=20 actually driving the coils less that the Mazda stock coils - but still = way above=20 Mark's truck at 12.5 sparks/second. In fact about 10 times more = than=20 Mark's truck with engine turning 1500 rpm.

FWIW

Ed

----- Original Message -----
From:=20 Russell=20 Duffy
To: Rotary motors in = aircraft

Sent: Wednesday, January 18, = 2006 11:47=20 AM

Subject: [FlyRotary] Re: LS1 = Coil=20 Failures

Each = rotor fires=20 once/revolution of the eccentric shaft. Cruising along at = 6000rpm,=20 that's 600 sparks/second/coil. =

Hi Mark,

Is this the new math I always heard about :-)

6000 rpm / 60 seconds =3D 100 sparks per second

Cheers,

Rusty (everyone's a critic <g>)

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