X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.121] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3873438 for flyrotary@lancaironline.net; Sat, 03 Oct 2009 18:41:15 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.121; envelope-from=eanderson@carolina.rr.com Received: from computername ([75.191.186.236]) by cdptpa-omta01.mail.rr.com with ESMTP id <20091003224040651.MBHN22985@cdptpa-omta01.mail.rr.com> for ; Sat, 3 Oct 2009 22:40:40 +0000 From: "Ed Anderson" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Too much oil pressure. Date: Sat, 3 Oct 2009 18:40:49 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003C_01CA4459.076C0BE0" X-Mailer: Microsoft Office Outlook, Build 11.0.5510 Thread-index: AcpEbwk0Xo4u6dPSRMqPmrDkS7ARrgAC0sHQ X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 In-reply-to: Message-Id: <20091003224040651.MBHN22985@cdptpa-omta01.mail.rr.com> This is a multi-part message in MIME format. ------=_NextPart_000_003C_01CA4459.076C0BE0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit George, you make the spring effectively stiffer. Some have done this by adding spacers inside the regulator housing to shorten and make the spring stiffer and offer more resistance to opening. This in effect increases the amount of oil pressure needed to push the valve open. You could of course add a stiffer spring. Ed Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://www.andersonee.com http://www.dmack.net/mazda/index.html http://www.flyrotary.com/ http://members.cox.net/rogersda/rotary/configs.htm#N494BW http://www.rotaryaviation.com/Rotorhead%20Truth.htm _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of George Lendich Sent: Saturday, October 03, 2009 5:18 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Too much oil pressure. 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. 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. 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. This must be a Renesis. The "O" ring would have blown out of a 13B. Lynn E. Hanover __________ Information from ESET NOD32 Antivirus, version of virus signature database 3267 (20080714) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com ------=_NextPart_000_003C_01CA4459.076C0BE0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

George, you make the spring = effectively stiffer. Some have done this by adding spacers inside the regulator = housing to shorten and make the spring stiffer and offer more resistance to = opening.  This in effect increases the amount of oil pressure needed to push the valve = open.  You could of course add a stiffer spring.

 

Ed

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of George Lendich
Sent: Saturday, October = 03, 2009 5:18 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = Too much oil pressure.

 

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.

 

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. =

 

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.

 

This must be a Renesis. The "O" ring would have blown = out of a 13B.

 

Lynn E. Hanover

 



__________ Information from ESET NOD32 Antivirus, version of virus = signature database 3267 (20080714) __________

The message was checked by ESET NOD32 Antivirus.

http://www.eset.com

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