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Return-Path: <13brv3@bellsouth.net> Received: from imf23aec.mail.bellsouth.net ([205.152.59.71] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 568272 for flyrotary@lancaironline.net; Wed, 15 Dec 2004 09:03:33 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.71; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf23aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20041215140243.RCTO2382.imf23aec.mail.bellsouth.net@rd> for ; Wed, 15 Dec 2004 09:02:43 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Injectors Date: Wed, 15 Dec 2004 08:02:50 -0600 Message-ID: <019f01c4e2ae$c348ede0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_01A0_01C4E27C.78AE7DE0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_01A0_01C4E27C.78AE7DE0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Using the 440cc injectors may help; but I don't think there is any = assurance that they will work well. Didn't Rusty try this?=20 =20 I don't remember it, but he may have.=20 =20 =20 Yes, I tried the 440/460 injectors, and didn't see any improvement in = idle. If I'm not mistaken, Mazda rated these injectors at a lower than = standard pressure. For the guys who've had theirs tested, didn't they flow over = 500 at standard pressure? For some reason, I'm thinking that the 550's were rated at normal pressure, and RC Engineering tested 4 of mine with = results between 549 and 551. My thinking is that there isn't much difference between the stock injectors. =20 For idle, response time is more important, and I've always wondered if = the difference wasn't between using high and low impedance injectors. I = believe low impedance injectors are supposed to react faster, and you have the option of varying the ballast resistor to give them more or less punch. This is just a wild theory that I'll never test. =20 Someone also correctly mentioned that Mazda lowers the voltage of the = fuel pump at idle. I don't see how this would change the pressure though, = since the regulator will still keep it the same. I'm sure there's a fuel = pressure spec in the shop manual, and it would mention a different pressure at = idle if there is one. Doubt it though. =20 Rusty =20 =20 =20 ------=_NextPart_000_01A0_01C4E27C.78AE7DE0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Using the = 440cc=20 injectors may help; but I don’t think there is any assurance that = they will work=20 well. Didn’t Rusty try this?

I don't remember it, but he may have.

Yes, I tried the 440/460 injectors, and = didn't see=20 any improvement in idle. If I'm not mistaken, Mazda rated these = injectors=20 at a lower than standard pressure. For the guys who've had theirs = tested,=20 didn't they flow over 500 at standard pressure? For some reason, = I'm=20 thinking that the 550's were rated at normal pressure, and RC = Engineering tested=20 4 of mine with results between 549 and 551. My thinking is = that there=20 isn't much difference between the stock=20 injectors.

For idle, response time is more important,=20 and I've always wondered if the difference wasn't between using = high and=20 low impedance injectors. I believe low impedance injectors = are=20 supposed to react faster, and you have the option of varying = the ballast=20 resistor to give them more or less punch. This is just a wild = theory that=20 I'll never test.

Someone also correctly mentioned that Mazda = lowers the=20 voltage of the fuel pump at idle. I don't see how this would = change the=20 pressure though, since the regulator will still keep it the same. = I'm sure=20 there's a fuel pressure spec in the shop manual, and it would = mention a=20 different pressure at idle if there is one. Doubt it=20 though.

Rusty

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