X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-04.southeast.rr.com ([24.25.9.103] verified) by logan.com (CommuniGate Pro SMTP 5.1.10) with ESMTP id 2159538 for flyrotary@lancaironline.net; Thu, 05 Jul 2007 10:03:13 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.103; 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-04.southeast.rr.com (8.13.6/8.13.6) with SMTP id l65E206q016186 for ; Thu, 5 Jul 2007 10:02:01 -0400 (EDT) Message-ID: <000901c7bf0d$1356bc80$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: [Fwd: [Fwd: RV-7A Cooling]] Date: Thu, 5 Jul 2007 10:02:07 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01C7BEEB.8BF8D140" 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_0006_01C7BEEB.8BF8D140 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Ok, Dennis. That small a hole should not make a significant difference = then. Just asked to make certain it was not the possible cause of the = problem. Actually more fluid (especially hot oil) through a 0.02 = opening than you might think. As I recall the old Ross Redrive had a = restrictor of only 0.03 and that still provide sufficient oil for the = redrive. But your flow through the 0.02 would probably be on the order = of a pint a minute or there abouts. So compared to the 15 or so GPM of = oil flow - it would be insignificant. =20 Yes, will be very interested in what difference the flow divert makes = (or not). I suspect that your primary challenge is to get sufficient = air flow through the oil cooler. The diverter should certainly help get = the proper balance between your oil and radiator. Ed ----- Original Message -----=20 From: Dennis Haverlah=20 To: Rotary motors in aircraft=20 Sent: Thursday, July 05, 2007 9:30 AM Subject: [FlyRotary] Re: [Fwd: [Fwd: RV-7A Cooling]] Buly, Ed, Mark I have an air flow diverter already built and will try it soon. It is = 1/8 foam core board covered with one thin layer of glass. =20 The oil filter mount came from Summit if I remember correctly. I used = the the arrows cast into the mount for oil in and out. I will check by = taking the filter off and pump oil out by turning the prop. Oil should = come into the filter near the outside - go through the filter media and = exit the center - correct? I have looked at the oil tank temperatures with an IR theometer. = I'll record the data as the engine oil warms up next time I run it. Buly - its great to hear you have such low temperatures with the same = oil cooler. There is hope for me!! My oil cooler is from a 13 B = powered Mazda . The AN-4 line out the top of the oil cooler has an 0.020 in. orfice. = It is used to bleed out any air trapped in the high end of the oil = cooler. The delta pressure across the orfice is very low because of oil = filter is the only restriction in theparallel main oil return line. The = water radiator is also using an orfice and an AN-4 line to blead air out = of it's high end. I think these blead lines should only pass a very = small amount of fluid while automatically removing any trapped air. Dennis,=20 I used the same oil cooler on my Cosmo 13B and it was cooling too = much in flight 137F at cruise.=20 I see one thing you have done that disturbs me. The oil line tapped = at the high end of the oil cooler going into the oil filter adapter = plate.. By doing this, great percentage of the oil is bypassing the oil = cooler core and going back into the block.=20 If it was me I'll block this outlet, and turn the oil cooler around, = so the oil gets in and out at the higher end. This will prevent an air = lock at the high end.=20 Buly=20 ------=_NextPart_000_0006_01C7BEEB.8BF8D140 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Ok, Dennis.  That small a hole should not = make a=20 significant difference then.  Just asked to make certain it was not = the=20 possible cause of the problem.  Actually more fluid (especially hot = oil)=20 through a 0.02 opening than you might think.  As I recall the old = Ross=20 Redrive had a restrictor of only 0.03 and that still provide sufficient = oil for=20 the redrive.  But your flow through the 0.02 would probably be on = the order=20 of a pint a minute or there abouts.  So compared to the 15 or so = GPM of oil=20 flow - it would be insignificant. 
 
Yes, will be very interested in what difference = the flow=20 divert makes (or not).  I suspect that your primary challenge is to = get=20 sufficient air flow through the oil cooler.  The diverter should = certainly=20 help get the proper balance between your oil and radiator.
 
Ed
----- Original Message -----
From:=20 Dennis Haverlah
Sent: Thursday, July 05, 2007 = 9:30=20 AM
Subject: [FlyRotary] Re: [Fwd: = [Fwd:=20 RV-7A Cooling]]

Buly, Ed, Mark
I have an air flow diverter already = built and=20 will try it soon.  It is 1/8 foam core board covered with one = thin layer=20 of glass. 
The oil filter mount came from Summit if I = remember=20 correctly.  I used the the arrows cast into the mount for oil in = and=20 out.  I will check by taking the filter off and pump oil out by = turning=20 the prop.  Oil should come into the filter near the outside - go = through=20 the filter media and exit the center - correct?

I have looked = at the=20 oil tank temperatures with an IR  theometer.  I'll record = the data=20 as the engine oil warms up next time I run it.

Buly - its great = to hear=20 you have such low temperatures with the same oil cooler.  There = is hope=20 for me!!  My oil cooler is from a 13 B powered Mazda
.
The = AN-4=20 line out the top of the oil cooler has an 0.020 in. = orfice.  It is=20 used to bleed out any air trapped in the high end of the oil = cooler.  The=20 delta pressure across the orfice is very low because of oil filter is = the only=20 restriction in theparallel main oil return line.  The water = radiator is=20 also using an orfice and an AN-4 line to blead air out of it's = high=20 end.   I think these blead lines should only pass a very = small=20 amount of fluid while automatically removing any trapped air.

Dennis, =
I used=20 the same oil cooler on my Cosmo 13B and it was cooling too  = much in=20 flight 137F at cruise.
I see one thing you have done that = disturbs me.=20 The oil line tapped  at the high end of the oil cooler going = into the=20 oil filter adapter  plate.. By doing this, great percentage of = the oil=20 is bypassing the  oil cooler core and going back into the = block.
If=20 it was me I'll block this outlet, and turn the oil cooler = around,  so=20 the oil gets in and out at the higher end. This will prevent = an  air=20 lock at the high end.
Buly




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