Return-Path: <13brv3@bellsouth.net> Received: from imf24aec.mail.bellsouth.net ([205.152.59.72] verified) by logan.com (CommuniGate Pro SMTP 4.1.2) with ESMTP id 2550724 for flyrotary@lancaironline.net; Wed, 27 Aug 2003 19:56:00 -0400 Received: from rad ([68.212.14.21]) by imf24aec.mail.bellsouth.net (InterMail vM.5.01.05.27 201-253-122-126-127-20021220) with ESMTP id <20030827235559.VDNK1810.imf24aec.mail.bellsouth.net@rad> for ; Wed, 27 Aug 2003 19:55:59 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "Flyrotary List" Subject: MSD injector test results Date: Wed, 27 Aug 2003 18:55:59 -0500 Message-ID: <000001c36cf6$c3df6ce0$0201a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C36CCC.DB0964E0" 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 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C36CCC.DB0964E0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Greetings, =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 I'm sure these are static flow rates, and I think they also do pulsed = flow tests, but I forgot to ask about that. I'll get them back in a week, so I'll check the results when I get the data sheets. 50 cc's difference = only represents about a 10% difference in flow, and doesn't really explain = the large difference in mixture that I see on the EC-2. I have to wonder if maybe there's more effect than the number would indicate, since my MSD's = are at the throttle body, with about a 20 inch run to get to the rotors. I = can see how this reduced efficiency might make them seem smaller than they = are, but I would also think that Ed would see the same thing, and maybe he = is. =20 =20 If you guys (Ed and Al) don't mind, I'd like to propose a test. At your convenience, and I'm not kidding- don't make any special trips, or go to = any real effort. Could each of you run at low power, below the staging = point, maybe 1500 rpm, and enable only one set of injectors at a time. I'd be interested to see what position on the mixture knob you have to use for = each set. On mine, I have to turn the mixture knob to about 9:00 for the = Mazda 550's, and about 3:00 for the MSD's. =20 =20 The test will be interesting, since (as I recall) Al has Mazda 550's as primaries, and also has the same MSD's that flow about 500 as = secondaries. I can't recall if I've ever seen the physical layout of these though. = Are they all the same distance from the rotors? =20 Ed, I believe, has matched injectors, with a large distance between the secondaries and the rotors. Any difference in his mixture setting will indicate a loss of efficiency resulting from the large distance.=20 =20 Sorry to keep dragging everyone through this, but the difference bugs = me. =20 Rusty (T minus 3 days to liftoff) =20 PS- speaking of fast, efficient operations, I sent my ailing Lightspeed Thirty-3G headset for repair Monday via next day UPS. Lightspeed got it Tuesday, fixed it, and shipped it out the same day, via next day UPS. = The repaired headset is back in my hands today, and they threw in a free = holder for the battery box that I told them I wanted to purchase. Bummer that = it broke, but mighty friendly folks, and GREAT service!=20 =20 =20 =20 =20 ------=_NextPart_000_0001_01C36CCC.DB0964E0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Greetings,
 
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
 
I'm sure these = are static=20 flow rates, and I think they also do pulsed flow tests, but I forgot to = ask=20 about that.  I'll get them back in a week, so I'll check the = results when I=20 get the data sheets.  50 cc's difference only represents about a = 10%=20 difference in flow, and doesn't really explain the large difference in = mixture=20 that I see on the EC-2.  I have to wonder if maybe there's more = effect than=20 the number would indicate, since my MSD's are at the throttle body, with = about a=20 20 inch run to get to the rotors.  I can see how this reduced = efficiency=20 might make them seem smaller than they are, but I would also think that = Ed would=20 see the same thing, and maybe he is. 
 
If you guys (Ed = and Al)=20 don't mind, I'd like to propose a test.  At your convenience, = and I'm=20 not kidding- don't make any special trips, or go to any real = effort.  Could=20 each of you run at low power, below the staging point, maybe 1500 rpm, = and=20 enable only one set of injectors at a time.  I'd be interested = to see=20 what position on the mixture knob you have to use for each set.  On = mine, I=20 have to turn the mixture knob to about 9:00 for the Mazda 550's, and = about 3:00=20 for the MSD's.   
 
The test will = be=20 interesting, since (as I recall) Al has Mazda 550's as primaries, = and also=20 has the same MSD's that flow about 500 as secondaries.  I can't = recall if=20 I've ever seen the physical layout of these though.  Are they = all the=20 same distance from the rotors?
 
Ed, I believe, = has matched=20 injectors, with a large distance between the secondaries and the = rotors. =20 Any difference in his mixture setting will indicate a loss of=20 efficiency resulting from the large = distance. 
 
Sorry to keep = dragging=20 everyone through this, but the difference bugs me.
 
Rusty (T minus = 3 days to=20 liftoff)
 
PS- speaking of = fast,=20 efficient operations, I sent my ailing Lightspeed Thirty-3G headset for = repair=20 Monday via next day UPS.  Lightspeed got it Tuesday, fixed it, and = shipped=20 it out the same day, via next day UPS.  The repaired headset is = back in my=20 hands today, and they threw in a free holder for the battery box that I = told=20 them I wanted to purchase.  Bummer that it broke, but mighty = friendly=20 folks, and GREAT service! 
 
  
 
 
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