X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from willowsprings.uwyo.edu ([129.72.10.31] verified) by logan.com (CommuniGate Pro SMTP 5.4.5) with ESMTPS id 5570702 for flyrotary@lancaironline.net; Thu, 31 May 2012 11:54:53 -0400 Received-SPF: none receiver=logan.com; client-ip=129.72.10.31; envelope-from=SBoese@uwyo.edu Received: from ponyexpress-ht5.uwyo.edu (extlb.uwyo.edu [172.26.4.4]) by willowsprings.uwyo.edu (8.14.4/8.14.4) with ESMTP id q4VFsHRF026631 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for ; Thu, 31 May 2012 09:54:17 -0600 (MDT) (envelope-from SBoese@uwyo.edu) Received: from ponyexpress-m10.uwyo.edu ([fe80::60dd:cb9e:6f71:3d48]) by ponyexpress-ht5.uwyo.edu ([fe80::addc:5ab0:b0f8:ab9e%13]) with mapi id 14.01.0339.001; Thu, 31 May 2012 09:54:17 -0600 From: "Steven W. Boese" To: Rotary motors in aircraft Subject: RE: [FlyRotary] Re: Injector balancing Thread-Topic: [FlyRotary] Re: Injector balancing Thread-Index: AQHNPz/MJNjN7NWPBECVSJfX1+Z3lZbkCnbD Date: Thu, 31 May 2012 15:54:16 +0000 Message-ID: <3E8191F276108F4481AB0721BBA9269E05C4B9BA@ponyexpress-m10.uwyo.edu> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [75.228.149.119] Content-Type: multipart/alternative; boundary="_000_3E8191F276108F4481AB0721BBA9269E05C4B9BAponyexpressm10u_" MIME-Version: 1.0 --_000_3E8191F276108F4481AB0721BBA9269E05C4B9BAponyexpressm10u_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Brian, I just made measurements on some Mazda OEM fuel injectors. A high impedenc= e injector draws 0.9 amps continuously at 12 V. A low impedence injector w= ithout a series resistor draws 5 amps continuously at 12 V. My 13B requires less than 20 amps continuous current in normal cruise confi= guration with the strobes on and one fuel pump in operation. Steve Boese RV6A, 1986 13B NA, RD1A, EC2 ________________________________ From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of = bktrub@aol.com [bktrub@aol.com] Sent: Thursday, May 31, 2012 9:11 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Injector balancing I've recently found that a 40 amp alternator is not sufficient to run a 13B= with electric fuel pumps and EFI. Seems the injectors take up a huge amou= nt of amperage at higher rpms. I'm fine on the ground,- at about 13.7 volts= , but when I'm running 5-6000 rpm, my voltage starts dropping and stabilize= s at a little below 12 volts after an hour of flying. I have two 18 AH batt= eries. I"ve got a Dynon D10, terra 250 Transponder, Xcom radio, EC2, EM2, a= nd two fuel pumps from RWS. I only run one pump at a time except for takeof= f and landing. Anyone know what the current draw for the injectors is at 60= 00 rpm? Looks like I need to add another alternator. Brian Trubee --_000_3E8191F276108F4481AB0721BBA9269E05C4B9BAponyexpressm10u_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Brian,

I just made measurements on some Mazda OEM fuel injectors. A = high impedence injector draws 0.9 amps continuously at 12 V. A l= ow impedence injector without a series resistor draws 5 amps continuously a= t 12 V.

My 13B requires less than 20 amps continuous current in normal cruise co= nfiguration with the strobes on and one fuel pump in operation.

Steve Boese

RV6A, 1986 13B NA, RD1A, EC2

From: Rotary motors in aircraft [flyrotary@= lancaironline.net] on behalf of bktrub@aol.com [bktrub@aol.com]
Sent: Thursday, May 31, 2012 9:11 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Injector balancing

I've recently found that a 40 amp alternator is not sufficient to run = a 13B with electric fuel pumps and EFI. Seems the injectors take up a= huge amount of amperage at higher rpms. I'm fine on the ground,- at a= bout 13.7 volts, but when I'm running 5-6000 rpm, my voltage starts dropping and stabilizes at a little below 12 volts = after an hour of flying. I have two 18 AH batteries. I"ve got a Dynon = D10, terra 250 Transponder, Xcom radio, EC2, EM2, and two fuel pumps from R= WS. I only run one pump at a time except for takeoff and landing. Anyone know what the current draw for the injecto= rs is at 6000 rpm?

Looks like I need to add another alternator.

Brian Trubee

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