Return-Path: <13brv3@bellsouth.net> Received: from imf18aec.mail.bellsouth.net ([205.152.59.66] verified) by logan.com (CommuniGate Pro SMTP 4.1) with ESMTP id 2516800 for flyrotary@lancaironline.net; Sun, 10 Aug 2003 20:15:42 -0400 Received: from rad ([68.212.0.134]) by imf18aec.mail.bellsouth.net (InterMail vM.5.01.05.27 201-253-122-126-127-20021220) with ESMTP id <20030811001540.NHGU4876.imf18aec.mail.bellsouth.net@rad> for ; Sun, 10 Aug 2003 20:15:40 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "Flyrotary List" Subject: tuning, day 2- Tommy's curse :-) Date: Sun, 10 Aug 2003 19:15:41 -0500 Message-ID: <001201c35f9d$b335af50$0201a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0013_01C35F73.CA5FA750" 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_0013_01C35F73.CA5FA750 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Greetings all, =20 I'll be lazy like yesterday, and just paste in my log from today's activities. As you'll read, I still seem to be on the receiving end of Tommy's injector curse :-) =20 =20 Speaking of injectors, is there an effective way to clean a sticking injector on the vehicle, or does it have to be removed. If I can't = clean it in place, I'll just replace both primaries with new Mazda injectors. = Heck, it's only money :-( =20 Thanks, Rusty =20 PS- my old RV-8 buddy is the web master for the local EAA chapter, and = he seems to like posting pictures at my expense. Enjoy. http://www.eaa485.org/Rusty_Duffy.html =20 =20 =20 8-10-03 / 8 hours / 1316 total =20 Wired up the latest tach, and also changed the Tiny Tach pickup wire. = The instructions show the pickup wire being wrapped around a plug wire 3-4 times, with maybe 1/8" between turns. I tried to outsmart the people = who designed it, and wrapped it the full length of the pickup wire (about 7 turns). I also made a tight coil out of it, rather than leaving a gap between turns. Results- the new tach does nothing, and the Tiny Tach = worked fine at all rpms. This is good news for me (and John Slade), since I = can continue to use the Tiny Tach. Out of curiosity, I put a very nice = digital, color oscilloscope on the LSI trigger wire to see that the pulse looked like. It's only about 4 volts, which is probably why the automotive = tachs don't like it. I would have to bet that the Mazda coils have a higher voltage on the trigger.=20 =20 With the MAP lines hooked up, the computer seems happier, as does my = boost gauge. I got through a rough tuning of the A controller, but idle and = low speed still isn't smooth, and tends to be rich. When I advance the = throttle to sea level pressure, I have a static rpm of 4900, and plenty of = throttle left. Fully advancing the throttle give 5900 rpm, at 3 psi of boost (33 inches MAP). This is with a pop-off valve set to 1.5 psi, and the = wastegate fully open. The boost is VERY controllable with the throttle lever, and having the boost gauge on top of the glare shield, in plain view will = make this work fine I believe. 3 psi is a good limit for now, and I'll = attempt to keep it at maybe 1 psi to prove that I can control it. Eventually, = I'll raise the pop-off valve setting, and allow higher boost to be available = at altitude. =20 =20 Now back to my rough engine problem. After some troubleshooting with = the primary and secondary injector switches, I've come to the conclusion = that I have a primary injector that's sticking. When running on the = secondaries alone, the idle is smooth down to about 900 rpm. Turning on the = primaries instantly makes the engine erratic. You can tell that the overall = mixture is rich from the air fuel meter, but leaning the mixture on the EC-2 = causes the engine to feel like it's running on a single rotor. I'm thinking = that one primary injector is leaking, or sticking open to some extent, and leaning the mixture reduces the good injector to the point where that = rotor quits firing. These were used injectors, that I didn't have tested, cleaned, or inspected, so I have no reason to believe they're working properly. I'll order two new injectors tomorrow, for about $250 each. = As much trouble as they are to replace, I'm going to put in new ones, so there's no chance of having to do this again. Once that's done, I = should be able to get back to tuning, and hopefully, it will go quickly. =20 =20 Finally, the engine is mighty cool without that big electric fan in the = way. I didn't see oil temps over 180, and water was at maybe 150-160. This = is actually too cool, but putting the top on the cowl will fix that to some extent, as would a thermostat. Better too cool, than too hot. =20 ------=_NextPart_000_0013_01C35F73.CA5FA750 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Greetings=20 all,
 
I'll be lazy = like=20 yesterday, and just paste in my log from today's activities.  As = you'll=20 read, I still seem to be on the receiving end of Tommy's injector curse=20 :-) 
 
Speaking of = injectors, is=20 there an effective way to clean a sticking injector on the vehicle, = or does=20 it have to be removed.  If I can't clean it in place, I'll just = replace=20 both primaries with new Mazda injectors.  Heck, it's only = money=20 :-(
 
Thanks,
Rusty
 
PS- my old RV-8 = buddy is=20 the web master for the local EAA chapter, and he seems to like posting = pictures=20 at my expense.  Enjoy.
http://www.eaa485.org/Rus= ty_Duffy.html
 
 
 

8-10-03  / =20 8 hours  /  1316 total

 

Wired = up the latest=20 tach, and also changed the Tiny Tach pickup wire.  The instructions show the = pickup wire=20 being wrapped around a plug wire 3-4 times, with maybe 1/8” = between turns.  I tried to outsmart the people = who=20 designed it, and wrapped it the full length of the pickup wire (about 7=20 turns).  I also made a = tight coil=20 out of it, rather than leaving a gap between turns.  Results- the new tach does = nothing, and=20 the Tiny Tach worked fine at all rpms. =20 This is good news for me (and John Slade), since I can continue = to use=20 the Tiny Tach.  Out of = curiosity, I=20 put a very nice digital, color oscilloscope on the LSI trigger wire to = see that=20 the pulse looked like.  = It’s only=20 about 4 volts, which is probably why the automotive tachs don’t = like it.  I would have to bet that the = Mazda coils=20 have a higher voltage on the trigger.

 

With = the MAP lines=20 hooked up, the computer seems happier, as does my boost gauge.  I got through a rough tuning = of the A=20 controller, but idle and low speed still isn’t smooth, and tends = to be=20 rich.  When I advance the = throttle=20 to sea level pressure, I have a static rpm of 4900, and plenty of = throttle=20 left.  Fully advancing the = throttle=20 give 5900 rpm, at 3 psi of boost (33 inches MAP).  This is with a pop-off valve = set to 1.5=20 psi, and the wastegate fully open. =20 The boost is VERY controllable with the throttle lever, and = having the=20 boost gauge on top of the glare shield, in plain view will make this = work fine I=20 believe.  3 psi is a good = limit for=20 now, and I’ll attempt to keep it at maybe 1 psi to prove that I = can control=20 it.  Eventually, = I’ll raise the=20 pop-off valve setting, and allow higher boost to be available at = altitude. 

 

Now = back to my rough=20 engine problem.  After = some=20 troubleshooting with the primary and secondary injector switches, = I’ve come to=20 the conclusion that I have a primary injector that’s = sticking.  When running on the = secondaries alone,=20 the idle is smooth down to about 900 rpm. =20 Turning on the primaries instantly makes the engine erratic.  You can tell that the overall = mixture is=20 rich from the air fuel meter, but leaning the mixture on the EC-2 causes = the=20 engine to feel like it’s running on a single rotor.  I’m thinking that one = primary injector=20 is leaking, or sticking open to some extent, and leaning the mixture = reduces the=20 good injector to the point where that rotor quits firing.  These were used injectors, = that I didn’t=20 have tested, cleaned, or inspected, so I have no reason to believe = they’re=20 working properly.  = I’ll order two=20 new injectors tomorrow, for about $250 each.  As much trouble as they are to = replace,=20 I’m going to put in new ones, so there’s no chance of having = to do this=20 again.  Once that’s = done, I should=20 be able to get back to tuning, and hopefully, it will go quickly. 

 

Finally,=20 the engine is mighty cool without that big electric fan in the way.  I didn’t see oil temps = over 180, and=20 water was at maybe 150-160.  = This is=20 actually too cool, but putting the top on the cowl will fix that to some = extent,=20 as would a thermostat.  = Better too=20 cool, than too hot.  
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