X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from n2.bullet.mail.re4.yahoo.com ([206.190.56.21] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with SMTP id 3700597 for flyrotary@lancaironline.net; Tue, 23 Jun 2009 09:09:44 -0400 Received-SPF: none receiver=logan.com; client-ip=206.190.56.21; envelope-from=casey.gary@yahoo.com Received: from [68.142.230.29] by n2.bullet.re4.yahoo.com with NNFMP; 23 Jun 2009 13:09:07 -0000 Received: from [69.147.75.183] by t2.bullet.re2.yahoo.com with NNFMP; 23 Jun 2009 13:09:07 -0000 Received: from [127.0.0.1] by omp104.mail.re1.yahoo.com with NNFMP; 23 Jun 2009 13:09:07 -0000 X-Yahoo-Newman-Property: ymail-5 X-Yahoo-Newman-Id: 355888.61897.bm@omp104.mail.re1.yahoo.com Received: (qmail 50934 invoked by uid 60001); 23 Jun 2009 13:09:07 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1245762547; bh=waMSx2pnmMWCSONy91ydcYp8D8uTLwcQIxVy0BRfW3E=; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=dBy9fyfrILSAzf1sOUDkO+DPj9jk9t7690/rLCz2pvPVcnfZPG+6unE0gj9xtKM3KvRE5gUjrQcrNV8nKInZGD9YAPyDqxq5rDAT3gbsjMfYyzcVtPt7Buk0XWy2uI/shJfat2Yi5zHbRMmT49aRIf94pMXXnKxvkL++UJLHGE0= DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=OCOG6D3Twnyrgbf9U9Rs6KkwKF9MJux8RrOMKOs5wS7KddNIE8fvJXebAa1gnPSKw0ur5Q3qDxgd9CJO9zHXTgZB7ew5IbJOIuDHnKNASTnykEXrOFI1MKx/xK2YXktYOOJ9x5d2zOlGEJJgqChqn2sAD/yh3Zi7WLub1I0f380=; Message-ID: <100752.49503.qm@web57516.mail.re1.yahoo.com> X-YMail-OSG: .LH26XYVM1mgQxn.m7P8Xa0PSUK5as3Ar9KpqDBqaHzqWjyuplaqsHTtbi3SmmuAopA0AsCRD6jGmVX5IMJiYMuPJ6GtO5bttkQg7MAp0sR30vwCyAyyE80q0nDHlGjAUiazoAARWrh_p.Cn_cFb00waPJOe1TOg96DxKN8pT21NkpX31n.jK0pu1V4nPXpUC2O_8d3sMOEH1_7n8MAPYr7mSF0KIHZiSOqOo4Kogod1FMRvqOeY9AYK0DxlF0iNd95z6SGTC3gcjCmXC1a6Uc1n Received: from [97.122.159.245] by web57516.mail.re1.yahoo.com via HTTP; Tue, 23 Jun 2009 06:09:07 PDT X-Mailer: YahooMailRC/1277.43 YahooMailWebService/0.7.289.15 References: Date: Tue, 23 Jun 2009 06:09:07 -0700 (PDT) From: Gary Casey Subject: Re: Duty Cycle for Injectors To: Rotary motors in aircraft In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-481881879-1245762547=:49503" --0-481881879-1245762547=:49503 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable George,=0AWell, there are "low pressure systems" and "low pressure systems"= ..=A0 Depends on the point of view, I guess.=A0 We're not talking about high= pressure direct injection (GDI)=A0systems that are now all the rage.=A0 Th= e original Bendix system ran at 39 psi - a little higher than the Bosch sys= tems at the time,which were, I think 29 psi (exactly 2 bar - a coincidence?= ) systems.=A0 The reason was that one of our applications was the Cadillac = V8 and the injectors were in a hotter location.=A0 The higher pressure was = to keep vapor formation at bay during a hot soak.=A0 Then some turbo Chrysl= er applications used 60 psi for the same reason.=A0 The injector design was= the same and most injectors will still open at pressures up to about 100 p= si.=A0 There were some lower pressure systems (about 20 psi, I think) that = used clever injector designs to reduce sensitivity to vapor formation.=A0 W= ell, I thought they were clever because some were mine.=A0 Higher pressure = operation can improve atomization, but that isn't a big consideration.=A0 Lower pressure= systems once allowed a lower cost fuel pump to be used, but that isn't tru= e any more.=A0 No, I don't think lower pressure systems are coming back.=0A= =0ANone of this discussion pertains to the "Bendix" aircraft injection syst= em, which is=A0a totally different concept.=0AGary=0A=0A=0A=0A=0A__________= ______________________=0A=0A=0A=0A-----Inline Message Follows-----=0A=0A=0A= Cary,=0AVery interesting, thank you for that info.=0ABendix is a low pressu= re injector system is it not?=0AI have been reading about the benefits of l= ow pressure systems - are they coming back in vogue?=0AGeorge ( down under)= =0A=0A=0A --0-481881879-1245762547=:49503 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
George,
=0A
Well, there are "low pressure sys= tems" and "low pressure systems".  Depends on the point of view, I gue= ss.  We're not talking about high pressure direct injection (GDI) = ;systems that are now all the rage.  The original Bendix system ran at= 39 psi - a little higher than the Bosch systems at the time,which were, I = think 29 psi (exactly 2 bar - a coincidence?) systems.  The reason was= that one of our applications was the Cadillac V8 and the injectors were in= a hotter location.  The higher pressure was to keep vapor formation a= t bay during a hot soak.  Then some turbo Chrysler applications used 6= 0 psi for the same reason.  The injector design was the same and most = injectors will still open at pressures up to about 100 psi.  There wer= e some lower pressure systems (about 20 psi, I think) that used clever inje= ctor designs to reduce sensitivity to vapor formation.  Well, I though= t they were clever because some were mine.  Higher pressure operation can improve atomization, b= ut that isn't a big consideration.  Lower pressure systems once allowe= d a lower cost fuel pump to be used, but that isn't true any more.  No= , I don't think lower pressure systems are coming back.
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None of this discussion pertains to the "Bendix" aircraft inj= ection system, which is a totally different concept.
=0A
Gary=
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Cary,
=0A
Very interesting, thank you for = that info.
=0A
Bendix is a low = pressure injector system is it not?
=0A
I have been reading about the benefits of low pressure systems - a= re they coming back in vogue?
=0A
George ( down under)
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