X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from poplet2.per.eftel.com ([203.24.100.45] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3873412 for flyrotary@lancaironline.net; Sat, 03 Oct 2009 17:18:16 -0400 Received-SPF: none receiver=logan.com; client-ip=203.24.100.45; envelope-from=lendich@aanet.com.au Received: from sv1-1.aanet.com.au (sv1-1.per.aanet.com.au [203.24.100.68]) by poplet2.per.eftel.com (Postfix) with ESMTP id 648DE1737FF for ; Sun, 4 Oct 2009 05:17:40 +0800 (WST) Received: from ownerf1fc517b8 (203.171.92.134.static.rev.aanet.com.au [203.171.92.134]) by sv1-1.aanet.com.au (Postfix) with SMTP id 794FEBEC00D for ; Sun, 4 Oct 2009 05:17:39 +0800 (WST) Message-ID: From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Too much oil pressure. Date: Sun, 4 Oct 2009 07:17:42 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0039_01CA44C2.C3986890" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-Antivirus: avast! (VPS 091003-0, 10/03/2009), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0039_01CA44C2.C3986890 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Lynn, How do you adjust the stock oil pressure regulator to higher than 71 = lbs. I haven't seen the insides but someone mentioned putting it in a press = and squeezing it down a bit. I assume it compresses a spring, but it = sounds like a 'quick and dirty' method of adjustment. Can you pull them = apart and put in a spacer? George ( down under) That would shorten the oil pressure lines to near normal, and remove = what is causing the higher than normal pressure at the filter stand. The = front pressure relief is set at 144 pounds. I bet the relief is standing = open to some extent, the whole time the oil is warming up. At the other = end of the oil pressure loop is the stock oil pressure regulator and it = is not going to open until it sees 71 pounds or whatever it is set at. = Once off idle (about 600 RPM) the stock pump has some excess capacity = and could support such a situation. So resistance to flow by the long = runs and the cooler could be producing a huge amount of pressure. If you = are measuring oil pressure on the engine, you would not see that = pressure on the gage.=20 So long as the engine is at idle or low speed this may not have been a = problem. If the engine were to rev up a bit oil pressure could have gone = to a bit over 144 pounds while showing 71 pounds on the gage.=20 This is peculiar to Mazda, where the regulator is at the end of the = system rather than inside the pump where it is supposed to be. Similar = to FI reulators on the end of the fuel rail, that can blow apart and set = the engine on fire.=20 This must be a Renesis. The "O" ring would have blown out of a 13B.=20 Lynn E. Hanover ------=_NextPart_000_0039_01CA44C2.C3986890 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Lynn,
How do you adjust the stock oil = pressure=20 regulator to higher than 71 lbs.
I haven't seen the insides but someone = mentioned=20 putting it in a press and squeezing it down a bit. I assume it = compresses a=20 spring, but it sounds like a 'quick and dirty' method of = adjustment.=20 Can you pull them apart and put in a spacer?
George ( down under)
 
That would shorten the oil pressure lines to = near normal,=20 and remove what is causing the higher than normal pressure at the = filter=20 stand. The front pressure relief is set at 144 pounds. I bet the = relief is=20 standing open to some extent, the whole time the oil is warming up. At = the=20 other end of the oil pressure loop is the stock oil pressure regulator = and it=20 is not going to open until it sees 71 pounds or whatever it is set at. = Once=20 off idle (about 600 RPM) the stock pump has some excess capacity and = could=20 support such a situation. So resistance to flow by the long runs and = the=20 cooler could be producing a huge amount of pressure. If you are = measuring oil=20 pressure on the engine, you would not see that pressure on the gage. =
 
So long as the engine is at idle or low speed = this may=20 not have been a problem. If the engine were to rev up a bit oil = pressure could=20 have gone to a bit over 144 pounds while showing 71 pounds on the = gage.
 
This is peculiar to Mazda, where the regulator = is at the=20 end of the system rather than inside the pump where it is supposed to = be.=20 Similar to FI reulators on the end of the fuel rail, that can blow = apart and=20 set the engine on fire.
 
This must be a Renesis. The "O" ring would have = blown out=20 of a 13B.
 
Lynn E. Hanover
 
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