Return-Path: Received: from [65.54.169.122] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.1b8) with ESMTP id 2443866 for flyrotary@lancaironline.net; Wed, 25 Jun 2003 20:44:41 -0400 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Wed, 25 Jun 2003 17:44:40 -0700 Received: from 65.137.51.173 by bay3-dav92.bay3.hotmail.com with DAV; Thu, 26 Jun 2003 00:44:40 +0000 X-Originating-IP: [65.137.51.173] X-Originating-Email: [lors01@msn.com] Reply-To: "Tracy Crook" From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] tach Date: Wed, 25 Jun 2003 20:45:35 -0400 Organization: Real World Solutions Inc. MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0095_01C33B5A.BA6E6BC0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Message-ID: X-OriginalArrivalTime: 26 Jun 2003 00:44:40.0262 (UTC) FILETIME=[206EC660:01C33B7C] This is a multi-part message in MIME format. ------=_NextPart_000_0095_01C33B5A.BA6E6BC0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Subject: [FlyRotary] tach Speaking of temporary gauges, the tach output of the AC-2 is supposed = to be 12 pulses per revolution. I'm assuming that's something that's = used only for the EIS, and not for normal tachs. Do you just tap into a = fuel injection, or ignition lead for normal tach pulses?=20 Sorry to talk to myself here, but I think I just realized that I don't = need to hook up a temporary tach. I have an optical tach, and should be = able to read the prop RPM from the cockpit (I did this to verify the = tach on my previous RV-8). I'll just have to do the math. I'm still a = little curious where you hook up a regular tach to the engine. =20 Rusty Turbo 13B powered RV-3 (experimental aircraft)...Be Afraid :-) 1993 RX-7 R1... Not stock, carry bail money :-) If you are using the Mazda coils, you can use the yellow tach wire = from the trailing coil which gives 2 pulses per rev. Works with most 4 = cyl. Automotive tachs. =20 If using AC Delco coils, the coil trigger signals from the EC2 give 1 = pulse per rev. =20 Of course the EM-2 reads the rpm directly from the EC-2 serial data = link. Tracy=20 ------=_NextPart_000_0095_01C33B5A.BA6E6BC0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Subject: [FlyRotary] tach

Speaking of temporary = gauges, the=20 tach output of the AC-2 is supposed to be 12 pulses per = revolution. I=92m=20 assuming that=92s something that=92s used only for the EIS, and not = for normal=20 tachs. Do you just tap into a fuel injection, or ignition lead = for=20 normal tach pulses?

Sorry to = talk to=20 myself here, but I think I just realized that I don=92t need to hook = up a=20 temporary tach. I have an optical tach, and should be able to = read the=20 prop RPM from the cockpit (I did this to verify the tach on my = previous=20 RV-8). I=92ll just have to do the math. I=92m still a = little curious=20 where you hook up a regular tach to the engine. =

Rusty

Turbo 13B powered RV-3=20 (experimental aircraft)...Be Afraid :-)

1993 RX-7 R1... Not = stock, carry=20 bail money :-)

If=20 you are using the Mazda coils, you can use the yellow tach wire from = the=20 trailing coil which gives 2 pulses per rev. Works with most 4 = cyl. =20 Automotive tachs.

If=20 using AC Delco coils, the coil trigger signals from the EC2 give 1 = pulse per=20 rev.

Of=20 course the EM-2 reads the rpm directly from the EC-2 serial data=20 link.

Tracy=20

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