X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.103] (HELO ms-smtp-04-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 5.0) with ESMTP id 813210 for flyrotary@lancaironline.net; Thu, 03 Nov 2005 08:31:45 -0500 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-025-165.carolina.res.rr.com [24.74.25.165]) by ms-smtp-04-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id jA3DUu1u028071 for ; Thu, 3 Nov 2005 08:30:57 -0500 (EST) Message-ID: <001a01c5e07a$dafea2c0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Another Run - with Questions Date: Thu, 3 Nov 2005 08:31:10 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0017_01C5E050.F1D2D9A0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0017_01C5E050.F1D2D9A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Joe, Your oil pressure regime appears to be nearly identical to mine so I see = no problems there. You may not get that low a manifold pressure with the rotary I normally = see between 12-14"Hg. EGTs are higher than mine (max 1650-1700F), but mine are installed = approx 8" from the port. Regarding the hot headers at 1600 rpm, you may = want to check your ignition timing and make certain you don't have a lot = of ignition retarded timing. See Tracy's instruction manual. I presume = you have set the static timing to his recommended 35Deg BTDC. My headers are make of schedule 40 SS pipe and they are approx 0.10" = thick and I have never seen them glow, but assume at higher power = settings that they do based on the effect of their radiant heat on some = plastic wiring protectors melting. Looks like things are going well for your first runs. Ed A ----- Original Message -----=20 From: Joe Hull=20 To: Rotary motors in aircraft=20 Sent: Thursday, November 03, 2005 1:47 AM Subject: [FlyRotary] Another Run - with Questions I ran the engine for an hour straight tonight. It seemed to run well = but I do have a couple of questions that maybe this esteemed group can = comment on. =20 1.. Engine starts out at about 1300RPM at idle when cold and Oil PSI = briefly is 81PSI and then drops to 65 or so after 15-20 seconds. Then as = things warm up the RPM's increase and oil pressure drops. RPM levels = out at about 1550 and oil pressure hovers around 30PSI. Is 30PSI an OK = oil pressure level at that RPM? I did increase the RPM briefly toward = the end of the hour and oil pressure did go up. At 1900-2000 RPM oil = pressure was around 50PSI.=20 2.. At the 1550 RPM the MicroTech says manifold pressure is 9-10Hg = (18-20PSI). Does that sound reasonable?=20 3.. EGT's are 2000-2050F. Seems a tad high to me!! My EGT probes = are located about 2.5" from the rotor housing. When I shut it down my = exhaust manifold/muffler was a very nice glowing red. It's made out of = Inconel and is .06 thick so it seems to hold up pretty well. But if = it's like this at 1600RPM what's it going to be at 5800RPM??=20 =20 Cooling seems to be OK at the moment. When ever it gets to 212F I've = got the MicroTech setup to turn on my radiator fan and it immediately = heads down and goes to 180F in 1-2 minutes. Oil temps never got above = 150F. But we are in Washington and the air temp was between 45F and 50F = so I'm sure that helped. =20 Thanx (rethinking fuel return and heater hoses) Joe Hull Redmond (Seattle), Washington Cozy MkIV #991 (working on Engine & Electrical & Finishing) http://www.maddyhome.com/canardpages/pages/JoeHull/index.html =20 ------=_NextPart_000_0017_01C5E050.F1D2D9A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Joe,
 
Your oil pressure regime appears to be nearly = identical to=20 mine so I see no problems there.
You may not get that low a manifold pressure = with the=20 rotary I normally see between 12-14"Hg.
EGTs are higher than mine (max 1650-1700F), but = mine are=20 installed approx 8" from the port.  Regarding the hot headers at = 1600 rpm,=20 you may want to check your ignition timing and make certain you don't = have a lot=20 of ignition retarded timing.  See Tracy's instruction manual.  = I=20 presume you have set the static timing to his recommended 35Deg=20 BTDC.
 
My headers are make of schedule 40 SS pipe and = they are=20 approx 0.10" thick and I have never seen them glow, but assume at higher = power=20 settings that they do based on the effect of their radiant heat on some = plastic=20 wiring protectors melting.
 
Looks like things are going well for your first=20 runs.
 
Ed A
 
----- Original Message -----
From:=20 Joe Hull=20
Sent: Thursday, November 03, = 2005 1:47=20 AM
Subject: [FlyRotary] Another = Run - with=20 Questions

I ran the engine for an = hour=20 straight tonight. It seemed to run well but I do have a couple of = questions=20 that maybe this esteemed group can comment = on.

 

  1. Engine = starts out=20 at about 1300RPM at idle when cold and Oil PSI briefly is 81PSI and = then=20 drops to 65 or so after 15-20 seconds. Then as things warm up the = RPM=92s increase and oil pressure drops.  RPM levels out at about = 1550 and oil=20 pressure hovers around 30PSI. =20 Is 30PSI an OK oil pressure level at that RPM?  I did increase the RPM = briefly=20 toward the end of the hour and oil pressure did go up. At 1900-2000 = RPM oil=20 pressure was around 50PSI.=20
  2. At the = 1550 RPM the=20 MicroTech says manifold pressure is = 9-10Hg=20 (18-20PSI).  Does that = sound=20 reasonable?=20
  3. EGT=92s are=20 2000-2050F.  Seems a = tad high to=20 me!!  My EGT probes = are located=20 about 2.5=94 from the rotor housing. =20 When I shut it down my exhaust manifold/muffler was a very = nice=20 glowing red.  It=92s = made out of=20 Inconel and is .06 thick so it seems to = hold up=20 pretty well.  But if = it=92s like=20 this at 1600RPM what=92s it going to be at = 5800RPM??=20

 

Cooling seems to be OK = at the=20 moment.  When ever it = gets to 212F=20 I=92ve got the MicroTech setup to turn on = my radiator=20 fan and it immediately heads down and goes to 180F in 1-2 = minutes.  Oil temps never got above = 150F.  But we are in Washington and = the air=20 temp was between 45F and 50F so I=92m sure that=20 helped.

 

Thanx=20 (rethinking fuel return and heater hoses)

Joe=20 Hull

Redmond=20 (Seattle), Washington

Cozy = MkIV #991=20 (working on Engine & Electrical & = Finishing)

http://www.maddyhome.com/canardpages/pages/JoeHull/index.html

 

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