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)
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| Subject: | Re: Which Oil Pressure Switch? |
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
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| Subject: | 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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