Return-Path: Received: from fed1rmmtao09.cox.net ([68.230.241.30] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 568051 for flyrotary@lancaironline.net; Wed, 15 Dec 2004 01:30:13 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.30; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao09.cox.net (InterMail vM.6.01.04.00 201-2131-117-20041022) with ESMTP id <20041215062945.GSQT2638.fed1rmmtao09.cox.net@BigAl> for ; Wed, 15 Dec 2004 01:29:45 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Injectors Date: Tue, 14 Dec 2004 22:30:00 -0800 Message-ID: <000001c4e26f$80cdba70$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C4E22C.72ACEB70" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C4E22C.72ACEB70 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: [FlyRotary] Injectors =20 One nagging problem that I have is the engine running rich at low power levels. I've turned the fuel pressure regulator down to 30 lbs to get = it reasonably lean, but I still don't have enough adjustment. The higher = power levels have a pretty good mixture on the default tuning. =20 I don't know what you mean by running out of adjustment. Do you mean = that turning the mixture knob fully CC it's still to rich? If so; follow = mode 1 instructions and program it much leaner. However, I don't think that's = the only issue. I could get mine lean enough, but still not get smooth = running at low power on those stock primary injectors. I lowered the fuel = pressure by 10 psi and found no noticeable improvement. =20 I could however; get it to run quite nicely of the 500cc MSD injectors = that I have in the secondary. These are still large, but work well at low = power. My solution was to simply move the staging relay from the secondary = power circuit to the primary power circuit, so it runs on the secondary at low power and all 6 at higher power (20B). Problem solved. This may not be a solution for every case, as my secondary injectors are = not all that far from the ports. =20 It begs the question: What did Mazda do to get good idle on those big injectors that we are not doing? =20 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 Al ------=_NextPart_000_0001_01C4E22C.72ACEB70 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Subject: [FlyRotary] Injectors

One nagging problem that I have is the engine running rich at low = power

levels. I've turned the fuel pressure regulator down to 30 lbs to get = it

reasonably lean, but I still don't have enough adjustment. The higher = power

levels have a pretty good mixture on the default tuning.

I don’t = know what you mean by running out of adjustment. Do you mean that turning = the mixture knob fully CC it’s still to rich? If so; follow mode = 1 instructions and program it much leaner. However, I don’t = think that’s the only issue. I could get mine lean enough, but = still not get smooth running at low power on those stock primary injectors. = I lowered the fuel pressure by 10 psi and found no noticeable = improvement.

I could = however; get it to run quite nicely of the 500cc MSD injectors that I have in the = secondary. These are still large, but work well at low power. My solution was to simply move the staging = relay from the secondary power circuit to the primary power circuit, so it = runs on the secondary at low power and all 6 at higher power (20B). Problem solved.

This may not = be a solution for every case, as my secondary injectors are not all that far = from the ports.

It begs the = question: What did Mazda do to get good idle on those big injectors that we are = not doing?

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?

Al

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