X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-03.southeast.rr.com ([24.25.9.102] verified) by logan.com (CommuniGate Pro SMTP 5.1.10) with ESMTP id 2158622 for flyrotary@lancaironline.net; Wed, 04 Jul 2007 21:32:46 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.102; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-103-061.carolina.res.rr.com [24.74.103.61]) by ms-smtp-03.southeast.rr.com (8.13.6/8.13.6) with SMTP id l651W9TW004676 for ; Wed, 4 Jul 2007 21:32:10 -0400 (EDT) Message-ID: <004301c7bea4$51e080d0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] [Fwd: [Fwd: RV-7A Cooling]] Date: Wed, 4 Jul 2007 21:32:15 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0040_01C7BE82.CA829590" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0040_01C7BE82.CA829590 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sorry to hear no improvement in oil temps. I personally believe that = you may need to put a vertical divider in your plenum to move more air = over to the side (where it does not want to go) where the oil cooler is. = Being in the center of your air flow, the air is finding an easier path = through your radiator rather than turning and going through your oil = cooler. =20 I used An-10 hose for all of the oil line routing - so don't know if = An-8 is overly small or not - but, I think some folks are using them = successfully. Also, make certain that the oil is routed into the oil filter correctly, = I've know of two people (me being one) that hooked them up reversed. I = found my error when no oil would flow during a cold cranking session to = build up oil pressure. The other person actually ended up blowing holes = in the rubber flap due to the pressure build up in the filter before oil = finally flowed - not the recommended way. My oil pressure is generally around 30 lbs at low idle, going up to 50 = psi by 3000 rpm and at 6000 it is generally 70 psi although if the oil = is hot like after take off it may temporarily drop to 65 psi. I do not use the stock oil pick up since my engine is rotated 90 deg. My 5 attempts to fix my oil temp problems produced marginal improvements = until I finally solved the problem by making certain the oil cooler had = adequate air flow. I suspect your problem may be similar. The only = thing I can suggest is to put a flow diverter to force more of the inlet = air to travel toward the oil cooler. I would do that before undertaking = any more drastic approaches. Good luck Ed ----- Original Message -----=20 From: Dennis Haverlah=20 To: Rotary motors in aircraft=20 Sent: Wednesday, July 04, 2007 6:44 PM Subject: [FlyRotary] [Fwd: [Fwd: RV-7A Cooling]] Flew my RV yesterday with OAT of 83 deg F - should have cooled really = well - No Joy!! The water was OK but the oil cooling just does not = appear to cool any better after all the duct/air flow improvements. The = wedge oil pan did not help either- I guess I did not have oil foaming = after all. My oil level in the wedge pan is 3/4 inch below the 1/2 inch = aluminum mounting plate. Now I'm wondering if my oil system is too flow = restrictive. My oil pressure only reaches 85 psi when the oil is cool = and when I'm flying it goes to the lower 60's. Oil pressure is measured = on the adaptor plate where the oil returnes to the engine. =20 My oil system is as follows: I come out of the normal oil outlet - (I = have not tapped the lower galley and plumbed the oil outlet there) - = with an An - 10 line to the Mazda (89?) oil cooler. After the oil = cooler, I use An-8 hose from the oil radiator to an aftermarket oil = filter housing with the K&N HP 1002 oil filter. From the oil filter I = use An-8 hose to go to the adaptor block on the enigne. Two pictures of = the oil system are attached. The attached pictures are early pictures = before the wiring etc. was in flight ready condition. The oil cooler is clean and I've removed and checked the oil by-pass = thermostat in hot water - it opened at or below 160 Deg F. Anyone know = of an easy and accurate way to determine if it is working properlly - = maybe check temps. at both ends of the oil radiator as the engine and = oil heats up. Also, is there an easy way to remove the oil thermostat = and seal the bypass hole? -------------------------------------------------------------------------= ----- -------------------------------------------------------------------------= ----- -------------------------------------------------------------------------= ----- -- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html ------=_NextPart_000_0040_01C7BE82.CA829590 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Sorry to hear no improvement in oil temps.  = I=20 personally believe that you may need to put a vertical divider in your = plenum to=20 move more air over to the side (where it does not want to go) where the = oil=20 cooler is.  Being in the center of your air flow, the air is = finding an=20 easier path through your radiator rather than turning and going through = your oil=20 cooler. 
 
I used An-10 hose for all of the oil line = routing - so=20 don't know if An-8 is overly small or not - but, I think some folks are = using=20 them successfully.
 
Also, make certain that the oil is routed into = the oil=20 filter correctly, I've know of two people (me being one) that hooked = them up=20 reversed.  I found my error when no oil would flow during a cold = cranking=20 session to build up oil pressure.  The other person actually ended = up=20 blowing holes in the rubber flap due to the pressure build up in the = filter=20 before oil finally flowed - not the recommended way.
 
My oil pressure is generally around 30 lbs at = low idle,=20 going up to 50 psi by 3000 rpm and at 6000 it is generally 70 psi = although if=20 the oil is hot like after take off it may temporarily drop to 65=20 psi.
I do not use the stock oil pick up since my = engine is=20 rotated 90 deg.
 
My 5 attempts to fix my oil temp problems = produced=20 marginal improvements until I finally solved the problem by making = certain the=20 oil cooler had adequate air flow.   I suspect your problem may = be=20 similar.  The only thing I can suggest is to put a flow diverter to = force=20 more of the inlet air to travel toward the oil cooler.  I would do = that=20 before undertaking any more drastic approaches.
 
Good luck
 
Ed
 
----- Original Message -----
From:=20 Dennis Haverlah
Sent: Wednesday, July 04, 2007 = 6:44=20 PM
Subject: [FlyRotary] [Fwd: = [Fwd: RV-7A=20 Cooling]]




Flew my RV yesterday with OAT of 83 deg F - = should=20 have cooled really well - No Joy!!  The water was OK but the oil = cooling=20 just does not appear to cool any better after all the duct/air flow=20 improvements.  The wedge oil pan did not help either- I guess I = did not=20 have oil foaming after all.  My oil level in the wedge pan is 3/4 = inch=20 below the 1/2 inch aluminum mounting plate.  Now I'm wondering if = my oil=20 system is too flow restrictive.  My oil pressure only = reaches 85=20 psi when the oil is cool and when I'm flying it goes to the lower=20 60's.  Oil pressure is measured on the adaptor plate where = the oil=20 returnes to the engine. 

My oil system is as = follows:  I=20 come out of the normal oil outlet - (I have not tapped the lower = galley and=20 plumbed the  oil outlet there) - with an An - 10 line to the = Mazda (89?)=20 oil cooler.  After the oil cooler, I use An-8 hose from the oil = radiator=20 to an aftermarket oil filter housing with the K&N HP 1002 oil = filter.=20    From the oil filter I use An-8 hose to go to the adaptor = block on=20 the enigne.  Two pictures of the oil system are = attached.  The=20 attached pictures are early pictures before the wiring etc. was in = flight=20 ready condition.

The oil cooler is clean and I've removed = and=20 checked the oil by-pass thermostat in hot water - it opened at or = below 160=20 Deg F. Anyone know of an easy and accurate way to determine if it is = working=20 properlly - maybe check temps. at both ends of the oil radiator as the = engine=20 and oil heats up.  Also,  is there an easy way to remove the = oil=20 thermostat and seal the bypass hole?

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