X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-iw0-f180.google.com ([209.85.214.180] verified) by logan.com (CommuniGate Pro SMTP 5.4.0) with ESMTPS id 5052259 for flyrotary@lancaironline.net; Thu, 14 Jul 2011 21:52:11 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.214.180; envelope-from=rwstracy@gmail.com Received: by iwn9 with SMTP id 9so673405iwn.25 for ; Thu, 14 Jul 2011 18:51:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=subject:references:from:content-type:x-mailer:in-reply-to :message-id:date:to:content-transfer-encoding:mime-version; bh=5u0uut03jJQqoJ3N0S8kYWXx0BtfAOEfaJf0ilSRGxQ=; b=HzZ9axJb79ubeIC5OafdwijEnB9KM0XHXmQ0zz4gH0G3WzQEgXoQOXJhY6Y/2qI88N JxBfLJIDZlrB59s1qo++i1luPsTvjP3Q4/yB8t+802GA+ATEoiixGpr6pAu38lZTq5zo mM8BRp5nyCQD3NXHiD789sgm3L3SlFXM5fuQ0= Received: by 10.42.196.6 with SMTP id ee6mr2983295icb.206.1310694696070; Thu, 14 Jul 2011 18:51:36 -0700 (PDT) Return-Path: Received: from [10.0.1.3] (99-197-145-127.cust.wildblue.net [99.197.145.127]) by mx.google.com with ESMTPS id g10sm480908ibe.12.2011.07.14.18.51.27 (version=TLSv1/SSLv3 cipher=OTHER); Thu, 14 Jul 2011 18:51:35 -0700 (PDT) Subject: Re: [FlyRotary] Oil Pressure Again References: From: Tracy Content-Type: multipart/alternative; boundary=Apple-Mail-12--472469338 X-Mailer: iPad Mail (8F191) In-Reply-To: Message-Id: <8FFFC496-D907-45B5-A0C5-3293CA7CC6AA@gmail.com> Date: Thu, 14 Jul 2011 21:51:20 -0400 To: Rotary motors in aircraft Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (iPad Mail 8F191) --Apple-Mail-12--472469338 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Chris, make it easier for Lynn and others to give you a meaningful read on t= his pressure. Answer this question clearly: Do you get a minimum of 10 psi per 1000 rpm at all power settings? That is m= ore or less the gold standard for making go - no go decisions on oil pressur= e. Tracy Sent from my iPad On Jul 14, 2011, at 7:46 PM, Chris Barber wrote:= > I hesitate asking about this again, but I am too close to possibly flying t= o drop the ball too much now. I have a drop in oil pressure again. It has d= ropped from the high 60's or so to between 20 psi to 40 psi (20 to 30 at low= er RPM and only up to around 40+ as I increase power). >=20 > =20 >=20 > My first thought was that it was the front o-ring and silicone ring in the= front cover. So, I pulled the front pan and replaced it. I also was able t= o check the front pressure port and the oil pump chain/key/washer etc and al= l was good. >=20 > =20 >=20 > I am about to have to pull the engine to check the bottom of the engine fo= r the oil pick up and rear port (after checking the hoses, but I would think= ing a blockage, depending on where it is, would increase pressure). One of t= he disadvantages of the Conversion Concepts mount is that I pretty much have= to pull the engine to check the bottom end. >=20 > =20 >=20 > My question is, other than the mentioned items, what else could cause this= sort of drop. I have hooked up a mechanical pressure gage (instead of the R= WS EM2). My concern is that it may be the front bearing as it was the only p= art I recall being closer to being out of spec. I hate the idea of having t= o tear down the engine again to replace this part especially since the engin= e is running all but perfectly and I was doing squawks preparing for my DAR i= nspection before this issue crept up. >=20 > =20 >=20 > Also, even though I can't think of a way, is there any way to replace the f= ront stationary gear/bearing without cracking the engine...just had to ask a= s I am not really liking the idea of cracking open the engine again, even th= ough I am getting a bit too good at it....but apparently not well enough to m= ake it actually work right. >=20 > =20 >=20 > As opposed to mucking around with red hearings and wild goose chases, I fi= gured I would just ask again. And yes, I have been reviewing the archives a= lready. >=20 > =20 >=20 > TIA >=20 > =20 >=20 > Thanks >=20 > =20 >=20 > Chris Barber >=20 > Houston. --Apple-Mail-12--472469338 Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=utf-8
Chris, make it easier for Lynn and others to give you a meaningful read on this pressure.  Answer this question clearly:

Do you get a minimum of 10 psi per 1000 rpm at all power settings?  That is more or less the gold standard for making go - no go decisions on oil pressure.

Tracy


Sent from my iPad

On Jul 14, 2011, at 7:46 PM, Chris Barber <cbarber@texasattorney.net> wrote:

I hesitate asking about this again, but I am too close to possibly flying to drop the ball too much now.  I have a drop in oil pressure again.  It has dropped from the high 60's or so to between 20 psi to 40 psi (20 to 30 at lower RPM and only up to around 40+ as I increase power).

 

My first thought was that it was the front o-ring and silicone ring in the front cover. So, I pulled the front pan and replaced it.  I also was able to check the front pressure port and the oil pump chain/key/washer etc and all was good.

 

I am about to have to pull the engine to check the bottom of the engine for the oil pick up and rear port (after checking the hoses, but I would thinking a blockage, depending on where it is, would increase pressure).  One of the disadvantages of the Conversion Concepts mount is that I pretty much have to pull the engine to check the bottom end.

 

My question is, other than the mentioned items, what else could cause this sort of drop.  I have hooked up a mechanical pressure gage (instead of the RWS EM2).  My concern is that it may be the front bearing as it was the only part I recall being closer to being out of spec.  I hate the idea of having to tear down the engine again to replace this part especially since the engine is running all but perfectly and I was doing squawks preparing for my DAR inspection before this issue crept up.

 

Also, even though I can't think of a way, is there any way to replace the front stationary gear/bearing without cracking the engine...just had to ask as I am not really liking the idea of cracking open the engine again, even though I am getting a bit too good at it....but apparently not well enough to make it actually work right.

 

As opposed to mucking around with red hearings and wild goose chases, I figured I would just ask again.  And yes, I have been reviewing the archives already.

 

TIA

 

Thanks

 

Chris Barber

Houston.

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