X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Received: from fed1rmmtao105.cox.net ([68.230.241.41] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 1985529 for flyrotary@lancaironline.net; Sat, 14 Apr 2007 17:35:44 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.41; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao105.cox.net (InterMail vM.7.05.02.00 201-2174-114-20060621) with ESMTP id <20070414213455.VSOK1266.fed1rmmtao105.cox.net@fed1rmimpo02.cox.net> for ; Sat, 14 Apr 2007 17:34:55 -0400 Received: from BigAl ([72.192.132.90]) by fed1rmimpo02.cox.net with bizsmtp id n9au1W00b1xAn3c0000000; Sat, 14 Apr 2007 17:34:54 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: RWS ECU Switch call-out Date: Sat, 14 Apr 2007 14:35:35 -0800 Message-ID: <000001c77ee5$38094290$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C77EA2.29E60290" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C77EA2.29E60290 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable To: Rotary motors in aircraft Subject: [FlyRotary] Re: RWS ECU Switch call-out =20 A thought on the injector power supply. In my installation I use a = separate power supply for primary and secondary injectors (as well as for the = coils.) In my case primaries are wired to battery 1 and secondaries are wired to = battery 2. Even if you are using a single battery (IMO) its beneficial = to=20 have separate wiring/switches/overload devices. If a power supply wire, = switch, overload, connection were to open there goes all supply to the=20 injectors (or coils.) =20 =20 I agree. Fault tolerance (read reliability) is redundancy from source = to use. I designed for either of any of the engine critical items (ECU, = coils, injectors, fuel pumps) to operate from either of two batteries, fully isolated. =20 This required the use of some diodes which may have uncovered some noise issues in the EC2 - don't know for sure yet. The isolation diodes can prevent voltage spikes from traveling back to the batteries where they = would dissipate. =20 Al ------=_NextPart_000_0001_01C77EA2.29E60290 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

To: Rotary motors in aircraft
Subject: [FlyRotary] Re: RWS ECU Switch call-out

 

A thought on the injector power supply.  In my installation I use a = separate

power supply for primary and secondary injectors (as well as for the coils.) =

In my case primaries are wired to battery 1 and secondaries are wired to =

battery 2.  Even if you are using a single battery (IMO) its beneficial to =

have separate wiring/switches/overload devices.  If a power supply wire, =

switch, overload, connection were to open there goes all supply to the =

injectors (or coils.) 

 

I = agree.  Fault tolerance (read reliability) is redundancy from source to use.  I designed = for either of any of the engine critical items (ECU, coils, injectors, fuel = pumps) to operate from either of two batteries, fully = isolated.

 <= /font>

This required = the use of some diodes which may have uncovered some noise issues in the EC2 - = don't know for sure yet.  The isolation diodes can prevent voltage spikes = from traveling back to the batteries where they would = dissipate.

 <= /font>

Al

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