X-Virus-Scanned: clean according to Sophos on Logan.com From: "Jeff Whaley" Received: from hub026-NJ-4.exch026.serverdata.net ([206.225.166.167] verified) by logan.com (CommuniGate Pro SMTP 6.1.2) with ESMTPS id 7699467 for flyrotary@lancaironline.net; Tue, 19 May 2015 08:11:38 -0400 Received-SPF: none receiver=logan.com; client-ip=206.225.166.167; envelope-from=jwhaley@datacast.com Received: from MBX026-E1-NJ-2.exch026.domain.local ([10.240.14.52]) by HUB026-NJ-4.exch026.domain.local ([10.240.14.39]) with mapi id 14.03.0224.002; Tue, 19 May 2015 05:11:02 -0700 To: "Steven W. Boese" Subject: RE: [FlyRotary] Re: Return to Flight - 2 Thread-Topic: [FlyRotary] Re: Return to Flight - 2 Thread-Index: AQHQkhrBNlcuPX/p7kSl5gFK3LI4/p2DMwZQ Date: Tue, 19 May 2015 12:11:01 +0000 Message-ID: <234B758DE9A64449BEB6BB5D1345CA7A48EC548E@mbx026-e1-nj-2.exch026.domain.local> References: <1431968086057.86979@uwyo.edu> In-Reply-To: <1431968086057.86979@uwyo.edu> Accept-Language: en-CA, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [209.87.232.162] Content-Type: multipart/alternative; boundary="_000_234B758DE9A64449BEB6BB5D1345CA7A48EC548Embx026e1nj2exch_" MIME-Version: 1.0 --_000_234B758DE9A64449BEB6BB5D1345CA7A48EC548Embx026e1nj2exch_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Steve, a long time ago I had only one Fluidyne oil cooler and it wasn't = enough, so ended up with two in series - one wasn't enough yet two is almos= t too much. I swapped the right Fluidyne for the Mazda to get temperature = control. I would never have guessed about the high pressures you pointed o= ut. Also don't know if it makes any difference which cooler is first but a= ctually the Mazda oil cooler is connected first to engine outlet and oil re= turns through the Fluidyne ... hard to see from pictures submitted. Jeff From: Steven W. Boese [mailto:flyrotary@lancaironline.net] Sent: Monday, May 18, 2015 12:55 PM Subject: Re: [FlyRotary] Re: Return to Flight - 2 Jeff, When checking for wasted inlet area, consider checking the necessity of hav= ing the Mazda oil cooler. From a previous photo, it appears that the oil f= lows from the pump to the Fluidyne cooler and then through the Mazda cooler= . The Fluidyne oil cooler may be of sufficient capacity to handle the oil = cooling by itself. I replaced the stock RX7 cooler with a Fluidyne DB 3061= 8 cooler of similar dimensions and the improvement in oil cooling was drama= tic. The three RX7 coolers that I tested all behaved identically in that= at RPM above 2600, the pressure at the inlet to the cooler was about 150 p= si and independent of RPM. It didn't matter whether the oil temperature wa= s 160 or 230 degrees. This means that at an RPM of 5200, half of the oil i= s being dumped directly back into the oil pan and not going through the coo= ler. With the Fluidyne cooler, all of the oil is passing through it, the b= ack pressure is only a few psi, the oil temperature at its outlet is less t= han 200 degrees in climb with an OAT of 90 degrees, and less than 1" H2O pr= essure across its core is sufficient to keep the oil temperature at the coo= ler outlet less than 190 in cruise. It is possible that the Mazda oil cooler in your system is acting purely as= a constriction to the oil flow and its internal thermostat isn't doing muc= h. The Fluidyne cooler may be operating at 150 psi or more most of the tim= e and is doing nearly all of the oil heat dissipation. If you haven't done this already, it may be very instructive to check the o= il pressure and temperature between your Fluidyne and Mazda oil coolers. Steve Boese RV6A, 1986 13B NA, RD1A, EC2 ________________________________ From: Rotary motors in aircraft > on behalf of Jeff Whaley > Sent: Monday, May 18, 2015 6:53 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Return to Flight - 2 I spent several hours yesterday working on the inlet plenum. First the pin= ch was removed and reprofiled with a gentle slope. Then I decided to divid= e the airflow front and back by adding a divide vane. I simply cut a notch= on both sides of the plenum, slipped in a sheet of aluminum and glassed ov= er the seams. Also added some foam core on the inside to aid the back half= of the core ... see attached photos. Still have to examine the outlet dif= fuser (or none) and/or cowl flap, plus check cowling to see if any inlet ar= ea is being wasted. Jeff ________________________________ This message, and the documents attached hereto, is intended only for the a= ddressee and may contain privileged or confidential information. Any unauth= orized disclosure is strictly prohibited. If you have received this message= in error, please notify us immediately so that we may correct our internal= records. Please then delete the original message. Thank you. --_000_234B758DE9A64449BEB6BB5D1345CA7A48EC548Embx026e1nj2exch_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Steve, a long time ago= I had only one Fluidyne oil cooler and it wasn’t enough, so ended up= with two in series – one wasn’t enough yet two is almost too much.  I swapped the right Fluidyne for the Mazda to get temperature = control.  I would never have guessed about the high pressures you poin= ted out.  Also don’t know if it makes any difference which coole= r is first but actually the Mazda oil cooler is connected first to engine outlet and oil returns through the Fluidyne … hard t= o see from pictures submitted.

Jeff

 <= /p>

From: Steven W= . Boese [mailto:flyrotary@lancaironline.net]
Sent: Monday, May 18, 2015 12:55 PM
Subject: Re: [FlyRotary] Re: Return to Flight - 2<= /p>

 

Jeff,

 

When checking for wasted inlet area, = consider checking the necessity of having the Mazda oil cooler.  From = a previous photo, it appears that the oil flows from the pump to the Fluidyne cooler and then through the Mazda cooler.  The Fluidy= ne oil cooler may be of sufficient capacity to handle the oil cooling by it= self.  I replaced the stock RX7 cooler with a Fluidyne DB 30618 cooler= of similar dimensions and the improvement in oil cooling was dramatic.    The three RX7 coolers that = I tested all behaved identically in that at RPM above 2600, the pressure at= the inlet to the cooler was about 150 psi and independent of RPM.  It= didn't matter whether the oil temperature was 160 or 230 degrees.  This means that at an RPM of 5200, half of the oil is b= eing dumped directly back into the oil pan and not going through the cooler= .  With the Fluidyne cooler, all of the oil is passing through it, the= back pressure is only a few psi, the oil temperature at its outlet is less than 200 degrees in climb with an OAT of= 90 degrees, and less than 1" H2O pressure across its core is sufficie= nt to keep the oil temperature at the cooler outlet less than 190= in cruise.

 

It is possible that the Mazda oil coo= ler in your system is acting purely as a constriction to the oil flow = and its internal thermostat isn't doing much.  The Fluidyne coole= r may be operating at 150 psi or more most of the time and is doing nearly = all of the oil heat dissipation.

 

If you haven't done this already, it = may be very instructive to check the oil pressure and temperature between y= our Fluidyne and Mazda oil coolers. 

 

S= teve Boese

R= V6A, 1986 13B NA, RD1A, EC2

 =

 

 

From: Rotary motors in aircraft <= flyrotary@lancaironline.net<= /a>> on behalf of Jeff Whaley <flyrotary@lancaironline.net>
Sent: Monday, May 18, 2015 6:53 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Return to Flight - 2

 =

I= spent several hours yesterday working on the inlet plenum.  First the= pinch was removed and reprofiled with a gentle slope.  Then I decided to divide the airflow front and back by adding a divide vane. = ; I simply cut a notch on both sides of the plenum, slipped in a sheet of a= luminum and glassed over the seams.  Also added some foam core on the = inside to aid the back half of the core ... see attached photos.  Still have to examine the outlet diffuser (or n= one) and/or cowl flap, plus check cowling to see if any inlet area is being= wasted.
Jeff

This message, and the documents attached hereto, is intended only for the a= ddressee and may contain privileged or confidential information. Any unauth= orized disclosure is strictly prohibited. If you have received this message= in error, please notify us immediately so that we may correct our internal records. Please then delete the origin= al message. Thank you. --_000_234B758DE9A64449BEB6BB5D1345CA7A48EC548Embx026e1nj2exch_--