X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.120] verified) by logan.com (CommuniGate Pro SMTP 5.4c2) with ESMTP id 4901310 for flyrotary@lancaironline.net; Wed, 09 Mar 2011 20:02:50 -0500 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.120; envelope-from=eanderson@carolina.rr.com Return-Path: X-Authority-Analysis: v=1.1 cv=pepdxKapwHuwCZNFD5uob2wvham6E+RljB0uXw08FdQ= c=1 sm=0 a=p1y_35hH5BQA:10 a=rPkcCx1H5rrOSfN0dPC7kw==:17 a=j2kv9ANfAAAA:8 a=fbNleBAprjh3u33EulYA:9 a=HfNk2-w3qn9DiaAkawnbLryrQN8A:4 a=wPNLvfGTeEIA:10 a=5R0GlYL7LfAA:10 a=yMhMjlubAAAA:8 a=BylQN-FzKuE5U4SoIaMA:9 a=XLUwsD3HBzmSO-G-KP4A:7 a=0OkGsRU6UWsIVOoPUEVXH_7tIN4A:4 a=rPkcCx1H5rrOSfN0dPC7kw==:117 X-Cloudmark-Score: 0 X-Originating-IP: 174.110.167.5 Received: from [174.110.167.5] ([174.110.167.5:55164] helo=EdPC) by cdptpa-oedge03.mail.rr.com (envelope-from ) (ecelerity 2.2.3.46 r()) with ESMTP id FA/91-19545-813287D4; Thu, 10 Mar 2011 01:02:16 +0000 Message-ID: <9AB3E6B10617401C989377ED72AEF941@EdPC> From: "Ed Anderson" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Injectors dead time was : [FlyRotary] Re: more staging and tuning Date: Wed, 9 Mar 2011 20:01:50 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0068_01CBDE94.D3E557E0" X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 This is a multi-part message in MIME format. ------=_NextPart_000_0068_01CBDE94.D3E557E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thanks, for the additional annotation on the chart, Steve. That does = make it clear what is happening during the "perturbation" phase. =20 Here is a sample of some "dead time" of various fuel injectors I found = on the web - the first number is dead time in microseconds. So as can = be seen the dead time due to injector latency can vary (in this case = from a low of 540 usec (approx 1/2 msec) to a high of 1600 usec or 1.6 = msec. =20 Stock Blue injectors: 728/420CC STI Pink injectors: 728/ 550CC PE 650's : 1500/650CC PE 800's : 1600/850CC Helix 660: 1180/660cc UR 785s: 770/785CC UR 785 D type 540/785CC Helix 820CC: 1120/820CC SIDE FEED injectors: Stock US STI: 1050/500CC Nismo 720cc : 880/720CC PE850s : 850/850CC Here is a link to even more injectors and their dead times http://injector-rehab.com/shop/lag.html Interestingly in this link also shows the apparent effect of voltage on = dead time and the advantage of peak and hold injectors in reducing (but = not eliminating dead time) Ed ------=_NextPart_000_0068_01CBDE94.D3E557E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Thanks, for the additional annotation on the = chart,=20 Steve. That does make it clear what is happening during the = "perturbation"=20 phase.

Here is a sample of some "dead time" of various = fuel=20 injectors I found on the web - the first number is dead time in=20 microseconds. So as can be seen the dead time due to injector = latency can=20 vary (in this case from a low of 540 usec (approx 1/2 msec) to a high of = 1600=20 usec or 1.6 msec.

Stock Blue injectors: 728/420CC
STI Pink = injectors:=20 728/ 550CC
PE 650's : 1500/650CC
PE=20 800's : 1600/850CC
Helix 660: 1180/660ccUR 785s: 770/785CC
UR 785 D = type=20 540/785CC
Helix 820CC: 1120/820CC

SIDE FEED injectors:
Stock US STI: 1050/500CCNismo 720cc : 880/720CC
PE850s = :=20 850/850CC

Here is a=20 link to even more injectors and their dead times

http://injector-rehab.co= m/shop/lag.html

Interestingly in this link also shows the = apparent effect=20 of voltage on dead time and the advantage of peak and hold injectors in = reducing=20 (but not eliminating dead time)

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