X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-d04.mx.aol.com ([205.188.157.36] verified) by logan.com (CommuniGate Pro SMTP 5.0) with ESMTP id 813218 for flyrotary@lancaironline.net; Thu, 03 Nov 2005 08:43:46 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.157.36; envelope-from=Lehanover@aol.com Received: from Lehanover@aol.com by imo-d04.mx.aol.com (mail_out_v38_r6.3.) id q.252.1572c5 (25508) for ; Thu, 3 Nov 2005 08:42:55 -0500 (EST) From: Lehanover@aol.com Message-ID: <252.1572c5.309b6ddf@aol.com> Date: Thu, 3 Nov 2005 08:42:55 EST Subject: Re: [FlyRotary] Another Run - with Questions To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1131025375" X-Mailer: 9.0 SE for Windows sub 5022 X-Spam-Flag: NO -------------------------------1131025375 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en In a message dated 11/3/2005 1:49:31 AM Eastern Standard Time, =20 JoeH@PilgrimTech.com writes: I ran the engine for an hour straight tonight. It seemed to run well but I=20 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=20 briefly is 81PSI and then drops to 65 or so after 15-20 seconds. Then as th= ings=20 warm up the RPM=E2=80=99s increase and oil pressure drops. RPM levels out a= t about=20 1550 and oil pressure hovers around 30PSI. Is 30PSI an OK oil pressure le= vel=20 at that RPM? I did increase the RPM briefly toward the end of the hour and= =20 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 =20 (18-20PSI). Does that sound reasonable? =20 3. EGT=E2=80=99s are 2000-2050F. Seems a tad high to me!! My EGT pr= obes are=20 located about 2.5=E2=80=9D from the rotor housing. When I shut it down my= exhaust=20 manifold/muffler was a very nice glowing red. It=E2=80=99s made out of In= conel and=20 is .06 thick so it seems to hold up pretty well. But if it=E2=80=99s like=20= this at=20 1600RPM what=E2=80=99s it going to be at 5800RPM?? =20 Cooling seems to be OK at the moment. When ever it gets to 212F I=E2=80= =99ve got=20 the MicroTech setup to turn on my radiator fan and it immediately heads dow= n=20 and goes to 180F in 1-2 minutes. Oil temps never got above 150F. But we ar= e=20 in Washington and the air temp was between 45F and 50F so I=E2=80=99m sure=20= that =20 helped.=20 Thanx (rethinking fuel return and heater hoses)=20 Joe Hull=20 Redmond (Seattle), Washington =20 I think the EGTs are out of bounds for any condition. The exhaust system =20 color seems to agree with the gage. =20 Look for trailing ignition not working, or, total advance under 20 degrees =20 TDC, or, TDC mark on pulley wrong, or, way lean or way rich mixture. At ligh= t =20 throttle, my gages hardly move. At best power I look for 1575 to 1600. This is rich of where you would want=20= =20 an airplane engine, but is good for racing. A/F between 12 and 13. =20 The oil pressure is also out of bounds. It isn't even up to stock street ca= r=20 engine pressure.=20 I have no clues on that. If it can get to 81 PSI under one condition, that =20 should be the oil pressure at full song. =20 In a warm-up from stone cold, I would expect to see high oil pressure to th= e=20 point that the relief valve lifts off and stops it at 80 PSI or whatever=20 yours is set at. Then as idle rpm increases a period of reduced pressure as= the=20 suction side is the limiting factor because of the bug screen and vena=20 contracta at the pickup tube. Then as the oil gets some heat in it, the bug= screen=20 and pickup becomes less of a problem, and pressure comes back up.=20 Maybe not to the relief pressure at idle, should go there smartly when the =20 throttle is blipped. =20 Water temps above 180 and oil above 160 cost a bunch or power. On a hot day= ,=20 water should be 180 to 185 and oil 190. That is on a scalding hot day at =20 full throttle. I would turn on the fans at 190 degrees. =20 I use an external pump that holds 100 PSI hot or cold. At idle (2,000 RPM) =20= I=20 have a solid 80 PSI and a rock solid 100 PSI above 2,400RPM. =20 Your results may vary. =20 =20 Lynn E. Hanover =20 -------------------------------1131025375 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en
In a message dated 11/3/2005 1:49:31 AM Eastern Standard Time,=20 JoeH@PilgrimTech.com writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>

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

 

  1. Engine star= ts 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=E2=80=99s increase and oil pressure drops.  RPM levels out at about 1550 a= nd 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=20= 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 sou= nd=20 reasonable?=20
  3. EGT=E2=80=99s  Seems a tad h= igh to=20 me!!  My EGT probes are lo= cated=20 about 2.5=E2=80=9D from the rotor housing. =20 When I shut it down my exhaust manifold/muffler was a very nice=20 glowing red.  It=E2=80=99s= made out of=20 Inconel and is .06 thick so it seems to hold= up=20 pretty well.  But if it= =E2=80=99s like=20 this at 1600RPM what=E2=80=99s it going to be at 5800RPM??=20

 

Cooling seems to be OK at th= e=20 moment.  When ever it gets t= o 212F=20 I=E2=80=99ve got the MicroTech setup to turn o= n my radiator=20 fan and it immediately heads down and goes to 180F in 1-2 minutes.  Oil temps never got above 150F.<= SPAN=20 style=3D"mso-spacerun: yes">  But we are in Washington and the= air=20 temp was between 45F and 50F so I=E2=80=99m sure that=20 helped.

 

Thanx= =20 (rethinking fuel return and heater hoses)

Joe=20 Hull

Redmond=20 (Seattle), Washington

 
I think the EGTs are out of bounds for any condition. The exhaust syste= m=20 color seems to agree with the gage.
 
Look for trailing ignition not working, or, total advance under 20 degr= ees=20 TDC, or, TDC mark on pulley wrong, or, way lean or way rich mixture. At ligh= t=20 throttle, my gages hardly move.
At best power I look for 1575 to 1600. This is rich of where you would=20= want=20 an airplane engine, but is good for racing. A/F between 12 and 13.
 
The oil pressure is also out of bounds. It isn't even up to stock stree= t=20 car engine pressure.
I have no clues on that. If it can get to 81 PSI under one condition, t= hat=20 should be the oil pressure at full song.
 
In a warm-up from stone cold, I would expect to see high oil pressure t= o=20 the point that the relief valve lifts off and stops it at 80 PSI or=20 whatever yours is set at. Then as idle rpm increases a period of reduced=20 pressure as the suction side is the limiting factor because of the bug scree= n=20 and vena contracta at the pickup tube. Then as the oil gets some heat in it,= the=20 bug screen and pickup becomes less of a problem, and pressure comes back up.= =20
Maybe not to the relief pressure at idle, should go there smartly when=20= the=20 throttle is blipped.
 
Water temps above 180 and oil above 160 cost a bunch or power. On a hot= =20 day, water should be 180 to 185 and oil 190. That is on a scalding hot day a= t=20 full throttle. I would turn on the fans at 190 degrees.
 
I use an external pump that holds 100 PSI hot or cold. At idle (2,000 R= PM)=20 I have a solid 80 PSI and a rock solid 100 PSI above 2,400RPM.
 
Your results may vary.
 
 
Lynn E. Hanover

<= /SPAN> 

 
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