Return-Path: <13brv3@bellsouth.net> Received: from imf23aec.mail.bellsouth.net ([205.152.59.71] verified) by logan.com (CommuniGate Pro SMTP 4.2b6) with ESMTP id 190792 for flyrotary@lancaironline.net; Sun, 20 Jun 2004 10:38:03 -0400 Received: from rad ([65.6.194.9]) by imf23aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040620143733.VVQX25164.imf23aec.mail.bellsouth.net@rad> for ; Sun, 20 Jun 2004 10:37:33 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: smaller injectors, same idle Date: Sun, 20 Jun 2004 09:37:34 -0500 Message-ID: <01ae01c456d4$20734fe0$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_01AF_01C456AA.379D47E0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_01AF_01C456AA.379D47E0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Personal anecdote: I have flow tested Mazda 460 x4 and 680 x2 injectors. = The 460s all actually flowed 520 and the 680s flowed ~750. This is at 3 bar = and 100% duty cycle. Perhaps Mazda rates these at 80% DC and MSD rates = theirs at 100%? =20 Thanks Mike, =20 I had always figured Mazda used their fuel pressure, rather than the standard 3 bar method, which made their ratings a little on the low = side. I wonder now if they only did this for some injectors, like the 460. = It's interesting that your test shows that the 460 flows 520. I had 550's = tested at RC Engineering, and they were right on the money. That would = actually explain why I saw no real difference. Here's a quote from a message I = sent a while back: =20 RC Engineering seems to be a very fast and efficient operation. They = just got my injectors today, and have already called with test results. I = sent 4 very slightly used Mazda 550's, and 2 new MSD-2013's, which are supposed = to be 50 lb/hr (525 cc/min). They said all 6 injectors were clean, and = needed no service at all. The MSD's flowed less than advertised, but not by = nearly as much as I figured. Here are the results: =20 MSD- 498, 503 Mazda- 547, 549, 551, 551 =20 =20 Thanks, Rusty (must find a way to install MSD's in the block...) ------=_NextPart_000_01AF_01C456AA.379D47E0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Personal anecdote: I have flow tested Mazda 460 x4 and = 680 x2=20 injectors. The 460s all actually flowed 520 and the 680s flowed ~750. = This is at=20 3 bar  and 100% duty cycle. Perhaps Mazda rates these at 80% DC and = MSD=20 rates theirs at 100%?

 
Thanks=20 Mike,
 
I had = always figured=20 Mazda used their fuel pressure, rather than the standard 3 bar method, = which=20 made their ratings a little on the low side.  I wonder now if they = only did=20 this for some injectors, like the 460.   It's interesting that = your=20 test shows that the 460 flows 520.  I had 550's tested at RC = Engineering,=20 and they were right on the money.  That would actually explain why = I saw no=20 real difference.  Here's a quote from a message I sent a while = back:
 
RC Engineering = seems to be=20 a very fast and efficient operation.  They just got my injectors = today, and=20 have already called with test results.  I sent 4 very slightly used = Mazda=20 550's, and 2 new MSD-2013's, which are supposed to be 50 lb/hr (525 = cc/min).  They said all 6 injectors were clean, and needed no = service at=20 all.  The MSD's flowed less than advertised, but not by nearly as = much as I=20 figured.  Here are the  results:
 
MSD- 498,=20 503
Mazda- 547, = 549, 551,=20 551
 
 
Thanks,
Rusty=20 (must find a way to install MSD's in the=20 block...)
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