Return-Path: Received: from [24.25.9.102] (HELO ms-smtp-03-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 592911 for flyrotary@lancaironline.net; Wed, 05 Jan 2005 21:54:43 -0500 Received-SPF: none receiver=logan.com; client-ip=24.25.9.102; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-069-132-111-212.carolina.rr.com [69.132.111.212]) by ms-smtp-03-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j062s5kd010647 for ; Wed, 5 Jan 2005 21:54:06 -0500 (EST) Message-ID: <000a01c4f39a$fd8e96b0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Acceptable oil pressure Date: Wed, 5 Jan 2005 21:54:07 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0007_01C4F371.14736F60" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0007_01C4F371.14736F60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I agree with Tracy, John. Sounds a bit low to me. Not dangerously low, = but not certain I would feel comfortable flying with it. I presume you = are measuring your pressure at the old oil filter location on the block = and after the oil filter and oil cooler, yes? What weight oil are you = using? Mine does not drop below 30 psi at idle, is 50 psi by 3000 rpm and is 70 = psi during flight. Your 60 psi at 4000 is does not bother me that much - but 15 at idle = sounds low based on my experience. Generally, I have found if you have air being sucked by the oil intake, = then it will take long to get the pressure up from zero after start, no = air leak and it jumps up as soon as engine fires. Now, the spinning shaft problem I had was when I lost the key out of = the oil pump shaft during reassembly and only the torque of the bolt = kept the chain sprocket driving the pump (for a while), it finally = started slipping and my pressure at idle drop to less than 20 psi. I = fortunately did not attempt to fly once I noticed that happening, = checked it out and found the key in bottom of the sump. I did not try to = rev the engine and see how much pressure I could get with a spinning = shaft. But, if it is the shaft spinning I would expect to see your oil = pressure continue to slowly drop as the shaft/sprocket wears. However, have not tried to pull oil off for a turbocharger as well as a = gear box. So 'fraid I can't offer much in the way of suggestions. ----- Original Message -----=20 From: John Slade=20 To: Rotary motors in aircraft=20 Sent: Wednesday, January 05, 2005 9:26 PM Subject: [FlyRotary] Acceptable oil pressure Leon and anyone else who cares to comment... The remaining question with my installation is whether the oil = pressure is acceptable, or whether something actually wrong. Everything has been triple calibrated now, so I'm pretty sure of the = following readings..... Start-up at 70F ambient gets me 80 - 85PSI. Once the oil gets hot I'm = seeing about 15 or so at idle, 25 PSI at 2000 rpm, 45 PSI at 3500 rpm, = and maybe 60 PSI at 4000. Talking about today with Tracy he felt it was = marginal, and was wondering if this might be normal with a combination = of a turbo and a redrive both taking pressure. Other possible causes he = suggested were Ed's spinning shaft syndrome or air being sucked by a = leaking oil pickup.=20 I hate to remove the engine (again) to check these items. What do people think? Anything else I can check? John (no more soot on the prop) ------=_NextPart_000_0007_01C4F371.14736F60 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I agree with Tracy, John. Sounds = a bit low to=20 me. Not dangerously low, but not certain I would feel comfortable = flying=20 with it. I presume you are measuring your pressure at the old oil = filter=20 location on the block and after the oil filter and oil cooler, = yes? What=20 weight oil are you using?

Mine does not drop below 30 psi at = idle, is 50 psi=20 by 3000 rpm and is 70 psi during flight.

Your 60 psi at 4000 is does not bother = me that much=20 - but 15 at idle sounds low based on my experience.

Generally, I have found if you have air = being=20 sucked by the oil intake, then it will take long to get the pressure up = from=20 zero after start, no air leak and it jumps up as soon as engine=20 fires.

Now, the spinning shaft problem = I had was=20 when I lost the key out of the oil pump shaft during reassembly and only = the=20 torque of the bolt kept the chain sprocket driving the pump (for a = while), it=20 finally started slipping and my pressure at idle drop to less than 20 = psi. =20 I fortunately did not attempt to fly once I noticed that happening, = checked it=20 out and found the key in bottom of the sump. I did not try to rev the = engine and=20 see how much pressure I could get with a spinning shaft. But, if = it is the=20 shaft spinning I would expect to see your oil pressure continue to = slowly drop=20 as the shaft/sprocket wears.

However, have not tried to pull oil off = for a=20 turbocharger as well as a gear box. So 'fraid I can't offer much = in the=20 way of suggestions.

----- Original Message -----
From:=20 John=20 Slade
To: Rotary motors in = aircraft

Sent: Wednesday, January 05, = 2005 9:26=20 PM

Subject: [FlyRotary] Acceptable = oil=20 pressure

Leon = and anyone=20 else who cares to comment...

The = remaining=20 question with my installation is whether the oil pressure is = acceptable, or=20 whether something actually wrong.

Everything has=20 been triple calibrated now, so I'm pretty sure of the following=20 readings.....

Start-up at 70F=20 ambient gets me 80 - 85PSI. Once the oil gets hot I'm seeing = about 15 or=20 so at idle, 25 PSI at 2000 rpm, 45 PSI at 3500 rpm, and maybe 60 PSI = at=20 4000. Talking about today with Tracy he felt it was = marginal, and=20 was wondering if this might be normal with a combination of a = turbo and a=20 redrive both taking pressure. Other possible causes he suggested = were=20 Ed's spinning shaft syndrome or air being sucked by a leaking oil = pickup.=20

I = hate to remove=20 the engine (again) to check these items.

What = do people=20 think? Anything else I can check?

John = (no more soot=20 on the prop)

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