X-Virus-Scanned: clean according to Sophos on Logan.com From: Received: from resqmta-ch2-05v.sys.comcast.net ([69.252.207.37] verified) by logan.com (CommuniGate Pro SMTP 6.2c1) with ESMTPS id 9603112 for flyrotary@lancaironline.net; Thu, 23 Mar 2017 20:52:32 -0400 Received-SPF: pass receiver=logan.com; client-ip=69.252.207.37; envelope-from=hoursaway1@comcast.net Received: from resomta-ch2-10v.sys.comcast.net ([69.252.207.106]) by resqmta-ch2-05v.sys.comcast.net with SMTP id rDRnclewwygj9rDSic4A6C; Fri, 24 Mar 2017 00:52:16 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcast.net; s=q20161114; t=1490316736; bh=5LIAPUr1e1RTZgohc5iUPlc9l15k3UBBGqBHrxR4XAM=; h=Received:Received:Date:From:To:Message-ID:Subject:MIME-Version: Content-Type; b=lw2R8iUC8KpjOWSN9fPyuEbTYkLBhWXvVMNemNM8Ll+jlSpB64kbmDs9Nh6vXokLy kRDyf3mOh+F+OXI/Xvl+s8nAZuYY5+OqxcWV7AWx5O8xLJIJXFJ+zxLvDyBlEhltfZ fnE26OjRO4NvCf49qTbvkcoQBRFqV59WV/PNoNW8ca4yC6kpxApHPslvytS9vwMEqj tuwH8xp8IRfFui+Wo/sc76gLoyUZcTny+pI2VZju/Sgvc3SmSLhIY2A2zq37S5NtqZ jQnIQnjOqcJ504u4omWUWkXLUec+s/utCv81eeYCcOnza2pBqMT57+x87uUgndntRH Wsif/olnt+cMA== Received: from resmail-ch2-632v.sys.comcast.net ([162.150.50.156]) by resomta-ch2-10v.sys.comcast.net with SMTP id rDSic1naxX2FjrDSicXK9g; Fri, 24 Mar 2017 00:52:16 +0000 Date: Fri, 24 Mar 2017 00:52:15 +0000 (UTC) To: "Fly rotary blog, e-mail" Message-ID: <957692075.24099398.1490316735904.JavaMail.zimbra@comcast.net> In-Reply-To: References: Subject: Re: [FlyRotary] Re: fuel system peer review MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_24099397_971771930.1490316735900" X-Originating-IP: [::ffff:68.49.229.174] X-Mailer: Zimbra 8.0.7_GA_6031 (ZimbraWebClient - GC51 (Win)/8.0.7_GA_6031) Thread-Topic: fuel system peer review Thread-Index: PYYctL8agSmSk5tVqQGaX30nSrjwZg== X-CMAE-Envelope: MS4wfFTWfPJjxb1hFGrHBAR14nvvt6o7Daa3laSjuI/CVPsHBsJro2gvixHisRANd/2ol8ySg/BgD5rapQAqSHwU/14zgXz9mNjZiYCCAvfn7thA1GRNukv8 SnGK4H0BR+bpJZKfOfdptN76SWRTPsGRJYYqDYnhX8w0FBrRbxwNTU/vd10stWFloUNveZoXLGsRqgWC3bHMkJhkY9hNdhgSncY= ------=_Part_24099397_971771930.1490316735900 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Steve, Dave Cook here, have you tried looking for that same pressure build-up pre Mazda oil cooler with the temp by-pass removed/by-passed, I'm thinking that is the cause of the restriction. David R. Cook RV6A Rotary ,MI ----- Original Message ----- From: "Steven W. Boese" To: "Rotary motors in aircraft" Sent: Thursday, March 23, 2017 12:11:21 AM Subject: [FlyRotary] Re: fuel system peer review Andrew, A Fluidyne DB-30618 is t he oil cooler I ended up with in the plane. When a pressure gauge was installed in the line between the front cover outlet and the RX7 oil cooler inlet, the pressure rose with increasing RPM to 150 psi at 2800 RPM. Increasing RPM above 2800 resulted in a steady pressure at 150 psi. Since the oil pump is a positive displacement pump, additional oil flow above 2800 RPM passes through the relief valve into the sump. At 5600 RPM half of the oil pumped by the oil pump never flows through the oil cooler. With the Fluidyne oil cooler, the pressure at its inlet never reaches 150 psi so all of the oil passes through it. An archive search for 25 Feb 2014 should find a description of various oil cooler configurations that I tested. Steve Boese From: Rotary motors in aircraft on behalf of Andrew Martin Sent: Wednesday, March 22, 2017 8:40:08 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: fuel system peer review This thread has perfect timing and great info for me. I was thinking of ditching my setup and simplifying it, but it looks like every system is a compromise. I just mounted a belly radiator which entailed moving the pumps & sump tank. As other local pilots had commented on how complex my fuel system was I thought it opportune to address it now. After following this thread though I'm inclined to stick with this setup now as I know it works. and just not let anyone else on the controls. Only problem I have is I cannot tell the fuel level in the sump tank. Need some sort of warning that I've drained a tank dry or have a vent or feed problem. Am thinking of putting a sight glass in the return line from sump to fuel selectors for a visual clue. I like this setup as it allows me to feed from any or all tanks. not needed but usually leave 1 transfer pump on. if both transfer pumps happened to fail the fuel return path gives a free flow path from tanks to sump also. I have managed to empty the sump tank once when flow testing the system but there was no back pressure on the system so regulator was not circulating fuel. I guessed the tank vent lines (1/4") are just to small when fuel flowing at 180l/hr and it vapourized in the sump. Steve. I'm interested to know the model No. of your fluidyne oil cooler. I started with these mods because I couldn't control my oil temps, so new belly radiator installed to give oil cooler all the cowl air, but I never thought that the mazda cooler may be blocking oil flow. Whats the clue that the front relief valve is opening? Andrew ------=_Part_24099397_971771930.1490316735900 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Steve, Dave Cook here, have you tried = looking for that same pressure build-up pre Mazda oil cooler with the = temp by-pass removed/by-passed, I'm thinking that is the cause of the restr= iction. David R. Cook  RV6A Rotary ,MI

From: "Steven W. Boese" <flyrotary@lancaironline.net>
<= b>To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>Sent: Thursday, March 23, 2017 12:11:21 AM
Subject: [Fly= Rotary] Re: fuel system peer review


Andrew,


A Fluidyne DB-30618 is the oil cooler I end= ed up with in the plane.


When a pressure gauge was = installed in the line between the front cover outlet and the RX7 oil cooler= inlet, the pressure rose with increasing RPM to 150 psi at 2800 RPM. = Increasing RPM above 2800 resulted in a steady pressure at 150 psi.  = Since the oil pump is a positive displacement pump, additional oil flow above 2800 RPM passes through the relief valve into the sump.&nbs= p; At 5600 RPM half of the oil pumped by the oil pump never flows through t= he oil cooler.


With the Fluidyne oil cooler, the pressure = at its inlet never reaches 150 psi so all of the oil passes through it.

=


An archive search for 25 Feb 2014 should find a description o= f various oil cooler configurations that I tested.


Steve B= oese



From: Rotary motors in aircraft <flyrotary@lancaironline.net= > on behalf of Andrew Martin <flyrotary@lancaironline.net>
= Sent: Wednesday, March 22, 2017 8:40:08 PM
To: Rotary motors= in aircraft
Subject: [FlyRotary] Re: fuel system peer review
 
<= div>

This thread has perfect timing and great info for m= e.

I was thinking of ditching my setup and simplifying it, bu= t it looks like every system is a compromise.
I just mounted a be= lly radiator which entailed moving the pumps & sump tank. As other loca= l pilots had commented on how complex my fuel system was I thought it oppor= tune to address it now. After following this thread though I'm inclined to = stick with this setup now as I know it works. and just not let anyone else = on the controls.
Only problem I have is I cannot tell the fuel lev= el in the sump tank. Need some sort of warning that I've drained a tank dry= or have a vent or feed problem. Am thinking of putting a sight glass in th= e return line from sump to fuel selectors for a visual clue.
I lik= e this setup as it allows me to feed from any or all tanks. not needed but = usually leave 1 transfer pump on. if both transfer pumps happened to fail t= he fuel return path gives a free flow path from tanks to sump also.
I have managed to empty the sump tank once when flow testing the system b= ut there was no back pressure on the system so regulator was not circulatin= g fuel. I guessed the tank vent lines (1/4") are just to small when fuel fl= owing at 180l/hr and it vapourized in the sump.

Steve. I'm in= terested to know the model No. of your fluidyne oil cooler. I started with = these mods because I couldn't control my oil temps, so new belly radiator i= nstalled to give oil cooler all the cowl air, but I never thought that the = mazda cooler may be blocking oil flow. Whats the clue that the front relief= valve is opening?

Andrew


------=_Part_24099397_971771930.1490316735900--