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Message-ID: <4AC7D150.4020300@gmail.com>
Date: Sat, 03 Oct 2009 17:33:52 -0500
From: Dave <david.staten@gmail.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Too much oil pressure.
References: <list-3873405@logan.com>
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The rear stock (and replacement custom) oil pressure regulative valves 
are piston/spring assemblies inside a threaded case.

Take the case apart (unscrew it). Put in washers to compress the spring 
more than stock, reassemble.

George Lendich wrote:
> 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
>      
>