Return-Path: Received: from [65.54.241.215] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.2.3) with ESMTP id 432122 for flyrotary@lancaironline.net; Sat, 25 Sep 2004 11:59:40 -0400 Received-SPF: none receiver=logan.com; client-ip=65.54.241.215; envelope-from=lors01@msn.com Received: from hotmail.com ([65.54.168.117]) by hotmail.com with Microsoft SMTPSVC(5.0.2195.6713); Sat, 25 Sep 2004 08:59:10 -0700 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Sat, 25 Sep 2004 08:59:09 -0700 Received: from 65.54.98.21 by bay3-dav13.bay3.hotmail.com with DAV; Sat, 25 Sep 2004 15:58:32 +0000 X-Originating-IP: [65.54.98.21] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] oil filter, pressure test, ewp Date: Sat, 25 Sep 2004 11:57:25 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00BE_01C4A2F6.D2C9C6B0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0006.2205 Seal-Send-Time: Sat, 25 Sep 2004 11:57:25 -0400 Message-ID: X-OriginalArrivalTime: 25 Sep 2004 15:59:09.0438 (UTC) FILETIME=[97CA59E0:01C4A318] Return-Path: lors01@msn.com This is a multi-part message in MIME format. ------=_NextPart_000_00BE_01C4A2F6.D2C9C6B0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageInteresting Rusty. My take on the oil pressure is that the = restriction of the oil cooler (evap core) is not a big factor. Who = cares whether the pressure is dropped by the cooler or the oil pressure = regulator? (until it drops it below regulator spec of course) My guess = is that the after cooler pressure will be the same as long as it is = above you regulator spec. My 2nd gen was 70 psi and FWIW, I think this = is enough for a NA engine running 7000 rpm or less. Wish I could trade = my 100 psi Renesis regulator for the old 70 psi without taking = everything apart. It's just wasted HP I think. What really concerns me is the poor oil cooling you are getting. I plan = to use an evap core for the 20B and on my mental scratch pad, it should = be better than the Mazda oil cooler in aircraft applications. Wish I = knew what the air pressure in front & back of your cooler is. Pressure = recovery is real important with evap cores. Tracy ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Friday, September 24, 2004 8:23 PM Subject: [FlyRotary] oil filter, pressure test, ewp Greetings, I installed the test fitting and gauge to read the oil pressure as it = comes out of the engine, before the oil cooler and filter. The current = filter was the Peterson inline 45 micron screen. This is suspected to = be too fine for use on oil, and was later changed to a 60 micron screen. = =20 =20 Test run 1- (45 micron screen, Mobile One 15w50 oil) 2000 rpm, 100 degree oil into the engine, 88 psi before cooler and = filter, 78 psi after (10 psi diff) 6000 rpm, 160 degree oil into the engine, 110 psi before cooler and = filter, 84 psi after (26 psi diff) =20 Test run 2- (60 micron screen, Mobile One 15w50 oil) 6000 rpm, 150 degree oil into the engine, 115 psi before cooler and = filter, 84 psi after (31 psi diff) 6000 rpm, 180 degree oil into the engine, 105 psi before cooler and = filter, 82 psi after (23 psi diff) =20 It's impossible to be too accurate with the before cooler pressure = reading, since the gauge skips from 90 psi to 150. Anything in between = is sort of an estimation. =20 =20 Oil temp seems to make the most difference. Best I can tell, changing = the oil filter screen to a larger size didn't make any difference, which = suggests that it wasn't my primary restriction. That pretty much leaves = the evap core, but it's impossible to tell if it's "bad", with nothing = else to compare it against. There's going to be some resistance, but = how much is too much? Either way, 115 psi shouldn't damage the evap = core, so I feel comfortable flying it again (when I re-skin my rudder = and left aileron). I also want to try 5w30 oil to see how that does, = both in pressure, and cooling ability. Maybe I'll do that tomorrow. =20 I was happy to note that the ewp fittings aren't leaking at all. This = just proves that if I weld something enough times, eventually I can make = it stop leaking. I was sort of hoping the water temps would seem a = little lower today, with the ewp running, but I can't say that's the = case. The temps REALLY shoot up at full throttle on the ground. =20 Cheers, Rusty (congrats Paul, imagine what it will feel like to actually fly = it) ------=_NextPart_000_00BE_01C4A2F6.D2C9C6B0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Interesting Rusty.  My take on the oil pressure is that the=20 restriction of the oil cooler (evap core) is not a big factor.  Who = cares=20 whether the pressure is dropped by the cooler or the oil pressure = regulator?=20 (until it drops it below regulator spec of course)  My guess is = that the=20 after cooler pressure will be the same as long as it is above you = regulator=20 spec.  My 2nd gen was 70 psi and FWIW, I think this is enough for a = NA=20 engine running 7000 rpm or less.  Wish I could trade my 100 psi = Renesis=20 regulator for the old 70 psi without taking everything apart.  It's = just=20 wasted HP I think.
 
What really concerns me is the poor oil cooling you are = getting.  I=20 plan to use an evap core for the 20B and on my mental scratch pad, it = should be=20 better than the Mazda oil cooler in aircraft applications.   = Wish I=20 knew what the air pressure in front & back of your cooler = is. =20 Pressure recovery is real important with evap cores.
 
Tracy
----- Original Message -----
From: Russell=20 Duffy
To: Rotary motors in = aircraft
Sent: Friday, September 24, = 2004 8:23=20 PM
Subject: [FlyRotary] oil = filter, pressure=20 test, ewp

Greetings,
 

I installed the test fitting and = gauge to read=20 the oil pressure as it comes out of the engine, before the oil cooler = and=20 filter.  The current = filter was=20 the Peterson inline 45 micron screen. =20 This is suspected to be too fine for use on oil, and was later changed to a 60 micron = screen. 

 

Test run 1-=20 (45 micron screen, Mobile One 15w50 oil)

2000 rpm, 100=20 degree oil into the engine, 88 psi before cooler and filter, 78 psi = after (10=20 psi diff)

6000 rpm, 160=20 degree oil into the engine, 110 psi before cooler and filter, 84 psi = after (26=20 psi diff)

 

Test run 2-=20 (60 micron screen, Mobile One 15w50 oil)

6000 rpm, 150=20 degree oil into the engine, 115 psi before cooler and filter, 84 psi = after (31=20 psi diff)

6000 rpm, 180=20 degree oil into the engine, 105 psi before cooler and filter, 82 psi = after (23=20 psi diff)

 

It=92s=20 impossible to be too accurate with the before cooler pressure reading, = since=20 the gauge skips from 90 psi to 150. =20 Anything in between is sort of an estimation. 

 

Oil temp seems to make the most = difference. =20 Best I can tell, changing the oil filter screen to a larger = size didn=92t=20 make any difference, which suggests that it wasn=92t my primary=20 restriction.  That = pretty much=20 leaves the evap core, but it=92s impossible to tell if it=92s = =93bad=94, with nothing=20 else to compare it against.  There's going to be some resistance, but = how much is=20 too much?  Either way, 115 psi shouldn=92t damage = the evap=20 core, so I feel comfortable flying it again (when I re-skin my rudder = and left=20 aileron).  I also want = to try 5w30=20 oil to see how that does, both in pressure, and cooling ability.  Maybe I=92ll do that = tomorrow.  

 

I was = happy to note=20 that the ewp fittings aren't leaking at all.  This just proves = that if=20 I weld something enough times, eventually I can make it stop=20 leaking.  I was sort of hoping the water temps would seem a = little lower=20 today, with the ewp running, but I can't say that's the case.  = The temps=20 REALLY shoot up at full throttle on the ground. =20

 

Cheers,

Rusty = (congrats Paul,=20 imagine what it will feel like to actually fly = it)

 

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