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Return-Path: <13brv3@bellsouth.net> Received: from imf19aec.mail.bellsouth.net ([205.152.59.67] verified) by logan.com (CommuniGate Pro SMTP 4.1) with ESMTP id 2516263 for flyrotary@lancaironline.net; Sun, 10 Aug 2003 00:50:18 -0400 Received: from rad ([68.212.0.134]) by imf19aec.mail.bellsouth.net (InterMail vM.5.01.05.27 201-253-122-126-127-20021220) with ESMTP id <20030810045017.ILCV22300.imf19aec.mail.bellsouth.net@rad> for ; Sun, 10 Aug 2003 00:50:17 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "Flyrotary List" Subject: Engine tuning, part 1 Date: Sat, 9 Aug 2003 23:50:17 -0500 Message-ID: <000d01c35efa$e58c06a0$0201a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000E_01C35ED0.FCB5FEA0" 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_000E_01C35ED0.FCB5FEA0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Greetings, =20 I made an attempt at tuning the engine today. I'll continue to beat my = head against the desk as you read my log entry. Thud, thud, thud... =20 Rusty =20 PS- I'm going to try unwrapping some of the trigger wire on the tiny = tach tomorrow, so that I only have 4 turns as the instructions suggest. It = will either help, or not. I'm pretty disgusted about this whole tach thing. = =20 =20 =20 =20 8-9-03 / 8 hours / 1308 total =20 Spent a long time running the engine today. Put just a bit over an hour = on it, and learned a lot about programming. I just couldn't get enough = fuel at the top end, and had too much fuel at the bottom. Unfortunately, most = of what I learned was that you can't really program it with the manifold pressure lines disconnected. I had the computer out to replace the software, but ended up putting it back with the original software. It = seems I forgot to put the lines back on. Doh! This also explains why my new boost gauge wasn't working as expected. Yep, I found that at the very = end of the day, so tomorrow, I get to try again, with more hope of success. = =20 The Tiny Tach seems to have a problem at higher RPMs. It's dead = accurate around 2100 rpm (verified with optical tach), but one time it read = static rpm as 4500, and another time it read 5900. What was even more = disturbing was that it went up from 5900 to 6100 as I decreased the throttle. = Groan. Bought a Sun tach this afternoon, and will give the ignition coil = trigger another try. =20 =20 In better news, the water temp never went above 170 degrees, and the oil maxed at about 230. That's a bit high for the oil, but it's Mobile One, SuperSyn, so it can take it. This is without the cooling fan, because = it blew a 30A fuse when I turned it on. That also caused the engine to = almost quit from the power surge. I guess the prop wash got the fan spun up, = which created a voltage across the fan motor. Turning on the switch seems to overload the circuit, and blow the fuse. Fortunately, since it seems to cool pretty well without the fan, I remove it, and saved 7 lbs at a = moment arm of 20". It also helps my nose heavy situation a bit. The new W&B calculations are as follows: =20 Right Main- 431 lb Left Main- 438.75 lb=20 Tailwheel- 25.25 lb Empty weight- 895 lb =20 Finally, I did verify that both sets of injectors work. Ed was right = about having to be a little rich at low power before turning off the primary injectors. It just takes a moment for the secondaries to become = effective it seems. =20 ------=_NextPart_000_000E_01C35ED0.FCB5FEA0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message

Greetings,

I made an = attempt at tuning=20 the engine today. I'll continue to beat my head against the desk = as you=20 read my log entry. Thud, thud, thud...

Rusty

PS- I'm going = to try=20 unwrapping some of the trigger wire on the tiny tach tomorrow, so that I = only=20 have 4 turns as the instructions suggest. It will either help, or=20 not. I'm pretty disgusted about this whole tach thing. =20

8-9-03 =20 / 8 hours / =20 1308 total

Spent a long time = running the=20 engine today. Put just a = bit over=20 an hour on it, and learned a lot about programming. I just couldn’t get = enough fuel at the=20 top end, and had too much fuel at the bottom. Unfortunately, most of what I = learned=20 was that you can’t really program it with the manifold pressure = lines=20 disconnected. I had the = computer=20 out to replace the software, but ended up putting it back with the = original=20 software. It seems I = forgot to put=20 the lines back on. = Doh! This also explains why my new = boost=20 gauge wasn’t working as expected. =20 Yep, I found that at the very end of the day, so tomorrow, I get = to try=20 again, with more hope of success. =20

The Tiny Tach seems = to have a=20 problem at higher RPMs. = It’s dead=20 accurate around 2100 rpm (verified with optical tach), but one time it = read=20 static rpm as 4500, and another time it read 5900. What was even more disturbing = was that=20 it went up from 5900 to 6100 as I decreased the throttle. Groan… Bought a Sun tach this = afternoon, and=20 will give the ignition coil trigger another try.

In better news, the = water temp=20 never went above 170 degrees, and the oil maxed at about 230. That’s a bit high for = the oil, but it’s=20 Mobile One, SuperSyn, so it can take it. =20 This is without the cooling fan, because it blew a 30A fuse when = I turned=20 it on. That also caused = the engine=20 to almost quit from the power surge. =20 I guess the prop wash got the fan spun up, which created a = voltage across=20 the fan motor. Turning on = the=20 switch seems to overload the circuit, and blow the fuse. Fortunately, since it seems to = cool=20 pretty well without the fan, I remove it, and saved 7 lbs at a moment = arm of=20 20”. It also helps = my nose heavy=20 situation a bit. The new = W&B=20 calculations are as follows:

Right=20 Main- 431 lb

Left = Main-=20 438.75 lb

Tailwheel- 25.25 = lb

Empty weight- 895 = lb

Finally, I did verify = that both=20 sets of injectors work. = Ed was=20 right about having to be a little rich at low power before turning off = the=20 primary injectors. It = just takes a=20 moment for the secondaries to become effective it seems.

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