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                           AeroElectric-List Digest Archive
                                      ---
                     Total Messages Posted Thu 04/20/23: 2
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Today's Message Index:
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     1. 07:53 AM - Re: Which Oil Pressure Switch?  (Mudfly)
     2. 11:14 AM - Re: Re: Which Oil Pressure Switch?  (Robert L. Nuckolls, III)
 
 
 
________________________________  Message 1  _____________________________________


Time: 07:53:33 AM PST US
Subject: AeroElectric-List: Re: Which Oil Pressure Switch?
From: "Mudfly" <shawntedwards@hotmail.com>


Several good ideas.
This company https://enmco.com/, suggested by Chris,  has several
options.  Just need to sort through them.
Thanks.
Shawn


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=510659#510659


________________________________  Message 2  _____________________________________


Time: 11:14:44 AM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Subject: Re: AeroElectric-List: Re: Which Oil Pressure Switch?

At 03:15 PM 4/17/2023, you wrote:
>
>Shawn -
>Have you considered a vacuum switch in the intake 
>manifold?   Activates when the engine starts, no threat or mess if it leaks.

   Most of cruising flight is at high
   manifold pressure if not max (throttle
   wide open) depending on altitude.
   Hence, no significant vacuum to operate
   a switch.

   Any automotive oil pressure switch is
   suited to task. We used to sell a
   Standard pressure switch off my
   website . . .was about $10 as I recall.

   You can generally pick one with threads
   that exactly match the engine's oil
   pressure port without adapters hence
   very low risk of leaks when joint is
   made up with proper application of
   Teflon tape.

   These switches are generally suited
   only for sensing 'active' oil pressure.
   I.e., they close at 4-10 psi. Fine
   for your Hobbs system.

   One could drive the HOBBS through
   a voltage sensitive switch that
   runs the meter if the bus is above
   13.5 volts (alternator delivering power).
   Similarly, driving directly
   from the engine bus of an electrically
   dependent engine would work (engine
   wouldn't be running if bus is cold).

   Yeah, there are a few instances when
   the HOBBS might power up with the
   engine not running, but the errors
   generated would be small and in the
   right direction thus changing oil
   or cleaning plugs a bit early.

   There is a cute little engine hour-meter
   that runs based on sensing ignition
   system activity.

https://tinyurl.com/mtw27jc3

   I've installed these on gas driven
   generators with good results. They
   sense ignition activity by means
   of a flying pigtail wrapped around
   the plug wire.  These could also
   be made to work by sensing activity
   on a magneto -lead.

   If you've got an electronic tachometer,
   the signal used to drive the tach could
   be easily conditioned to become an
   activity switch for the hour meter.

   Lots of ways to 'skin' this cat . . .


   Bob . . .

                    ////
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    ================================

    In the interest of creative evolution
    of the-best-we-know-how-to-do based
    on physics and good practice.

 

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