X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from pop3.greatbasin.net ([207.228.35.5] verified) by logan.com (CommuniGate Pro SMTP 5.2.10) with ESMTP id 3304326 for flyrotary@lancaironline.net; Mon, 17 Nov 2008 12:48:18 -0500 Received-SPF: none receiver=logan.com; client-ip=207.228.35.5; envelope-from=drwalker@gbis.com Received: from gatewayhg8lyg0 (node91.76.251.72.1dial.com [72.251.76.91]) by pop3.greatbasin.net (8.13.8/8.13.8) with SMTP id mAHHlbWs003819 for ; Mon, 17 Nov 2008 09:47:38 -0800 Message-ID: <002001c948dc$97abe640$5b4cfb48@gatewayhg8lyg0> From: "Don Walker" To: Subject: high EGT temps Rotor #1 Date: Mon, 17 Nov 2008 11:38:06 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0008_01C948A8.F5A70880" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3350 This is a multi-part message in MIME format. ------=_NextPart_000_0008_01C948A8.F5A70880 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Rotorians, Now that the airplane is painted, weighed, prop ballenced and etc. I'm = into tuning and getting comfortable with the engine. Yesterday I = noticed that as I ran the engine up, #1 rotor EGT trailed #2 by 20 to 30 = degrees and then at about 20 inches of manifold, #1 started climbing = rapidly! At max static throttle 5828 rpm (prop speed of 2045) or so, = #1 runs to 1640 degrees while #2 maxes at 1480 degrees. I played with = the mixture etc. No difference. I have checked the plugs and swaped = them. No difference. Stock RX-7 plugs. Pulled one and then the other = secondary inj. connector. It starts and runs and then drops off as RPM = gets high. Same on both #1 and 2. Swapped injectors. No difference. = Tryed using Mode 4, both to increase mixture and then to decrease. No = difference. Reset Mode 4 back to default. Swapped EGT probes. High = temps showed up on #2 on EM-2. Swapped back. Checked the archives. = Nothing. The EGT probes are installed through holes in the exhaust 5 = inches from the engine outlet. So I am at a loss. Any thoughts on = what might be causing this? Engine basically running smooth and strong. = Months ago, I remember getting 6150 RPM, but couldn't get it to run = long enough to check out EGTs. Cooling problems. A couple of other = things that may or may not have anything to do with this. Manifold = display on EM-2 sometimes jumps around some. I have tried porting to = the front of the intake and to the rear. Now I have it teed to both. = Auto tune tries to work, but does not. (O2 sensor installed at end of = tangenial) I ran it almost 2.5 hours total yesterday. 11.7 hours = total. since last December. Quietest airplane on the field. Lots of = attention from other pilots. Don Walker RV-8 N113BR Renesis 4 port. RD-1c EC-2 EM-2 Tuned 17.5 inch intake. Tuned 24 inch exhaust into tangetial premuffler catto 76/88. Field elevation 5000 ft. density 6200 ------=_NextPart_000_0008_01C948A8.F5A70880 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Rotorians,

Now that the airplane is painted, = weighed, prop=20 ballenced and etc. I'm into tuning and getting comfortable with = the=20 engine. Yesterday I noticed that as I ran the engine up, #1 rotor = EGT=20 trailed #2 by 20 to 30 degrees and then at about 20 inches of manifold, = #1=20 started climbing rapidly! At max static throttle 5828 rpm = (prop=20 speed of 2045) or so, #1 runs to 1640 degrees while #2 maxes at = 1480=20 degrees. I played with the mixture etc. No difference. = I have=20 checked the plugs and swaped them. No difference. Stock RX-7 = plugs. Pulled one and then the other secondary inj. = connector. =20 It starts and runs and then drops off as RPM gets high. Same on = both #1=20 and 2. Swapped injectors. No difference. Tryed using = Mode 4,=20 both to increase mixture and then to decrease. No = difference. Reset=20 Mode 4 back to default. Swapped EGT probes. High temps = showed up on=20 #2 on EM-2. Swapped back. Checked the archives. = Nothing. =20 The EGT probes are installed through holes in the exhaust 5 inches from = the=20 engine outlet. So I am at a loss. Any thoughts on what = might=20 be causing this? Engine basically running smooth and strong. = Months=20 ago, I remember getting 6150 RPM, but couldn't get it to run long enough = to=20 check out EGTs. Cooling problems. A couple of other things = that may=20 or may not have anything to do with this. Manifold display on EM-2=20 sometimes jumps around some. I have tried porting to the = front of the=20 intake and to the rear. Now I have it teed to both. Auto = tune tries=20 to work, but does not. (O2 sensor installed at end of = tangenial) I=20 ran it almost 2.5 hours total yesterday. 11.7 hours total. since = last=20 December. Quietest airplane on the field. Lots of attention = from=20 other pilots.

Don Walker

RV-8 N113BR

Renesis 4 port. RD-1c

EC-2 EM-2

Tuned 17.5 inch intake.

Tuned 24 inch exhaust into tangetial=20 premuffler

catto 76/88. Field elevation 5000 = ft. =20 density 6200

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