Today's Message Index:
----------------------
1. 05:57 AM - Re: Which Oil Pressure Switch? (Mudfly)
2. 06:52 AM - Re: Re: Which Oil Pressure Switch? (Robert L. Nuckolls, III)
3. 07:06 AM - Re: Re: Which Oil Pressure Switch? (Charlie England)
4. 07:14 AM - Re: Which Oil Pressure Switch? (Eric Page)
5. 08:35 AM - Re: Re: Which Oil Pressure Switch? (Robert L. Nuckolls, III)
6. 01:59 PM - Re: Which Oil Pressure Switch? (Mudfly)
7. 10:53 PM - Re: Which Oil Pressure Switch? (Eric Page)
Message 1
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| Subject: | Re: Which Oil Pressure Switch? |
Thanks Bob.
I like these two ideas you mentioned in your post.
1. "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)."
2. "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.
I'm using a 3 wire (+,-, and enable pins) LCD meter and
would like the numbers to display when battery is
switched on, but not start the timer. I'm having trouble
finding a wire diagram for my unit, but guess the enable
pin goes to ground. I will need to do some more
homework to see if I can make the options you mentioned work.
I'm using garmin stuff so possibly there's a way to
make either option 1 or 2 above work. If not, I may have to resort back
to using the oil pressure switch.
Thanks again,
Shawn
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510662#510662
Message 2
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| Subject: | Re: Which Oil Pressure Switch? |
> 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.
Follow up:
I've received a couple of notes from
learned List readers that Teflon tape
as a thread sealant comes with some
risks.
I remember writing paragraphs in Cessna
field service documents describing the
'proper application' of Teflon tape
on certain fluid fittings. If the
tape's wrappings extend too far down
the taper, there is risk that some
shreds created by the mating forces
will be dropped into the fluid stream.
Not a good thing. Back in '66 we
were specific on the care taken to leave
two threads of the fitting clear of
tape such that ALL products of
installation were contained in
the joint.
To be sure, there are less risky
products out there for sealing
of NPT (tapered pipe) threads and
on the advice of our experienced
readers, I would agree. Get some
'better' dope if you can . . .
but skillfully applied Teflon works
too.
Bob . . .
////
(o o)
===========o00o=(_)=o00o========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
Message 3
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| Subject: | Re: Which Oil Pressure Switch? |
On Fri, Apr 21, 2023 at 8:57=AFAM Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> 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.
>
>
> Follow up:
>
> I've received a couple of notes from
> learned List readers that Teflon tape
> as a thread sealant comes with some
> risks.
>
> (snipped)
> To be sure, there are less risky
> products out there for sealing
> of NPT (tapered pipe) threads and
> on the advice of our experienced
> readers, I would agree. Get some
> 'better' dope if you can . . .
> but skillfully applied Teflon works
> too.
>
>
> Bob . . .
>
The concern with tape is that even if it's applied to the threads properly,
upon removal of the device some of it can remain in the female threads, and
get pushed into the passageway when the device is re-installed.
I don't know whether that's a valid concern, but I use teflon dope so I
don't have to find out. ;-)
Charlie
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Message 4
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| Subject: | Re: Which Oil Pressure Switch? |
I found this, and several other fittings like it, when disassembling the header
tank plumbing on my second-hand Kitfox project. The first builder had used Teflon
tape in their assembly without proper care.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510665#510665
Attachments:
http://forums.matronics.com//files/teflon_311.jpg
Message 5
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| Subject: | Re: Which Oil Pressure Switch? |
At 07:56 AM 4/21/2023, you wrote:
>
>Thanks Bob.
>I like these two ideas you mentioned in your post.
>
>1. "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)."
I can sketch this circuit out
for you. Is there an installation
document for the make/model of
your hour meter?
Curious: What kind of ignition
system do you have?
Bob . . .
////
(o o)
===========o00o=(_)=o00o========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
Message 6
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| Subject: | Re: Which Oil Pressure Switch? |
[quote="nuckolls.bob(at)aeroelect"]At 07:56 AM 4/21/2023, you wrote:
Thanks Bob.
I like these two ideas you mentioned in your post.
1. "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)." [/quote]
I can sketch this circuit out
for you. Is there an installation
document for the make/model of
your hour meter?
Curious: What kind of ignition
system do you have?
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< show me where I'm wrong. >
================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.[/quote]
Bob,
It's a Honeywell LM-HH3AS-H21. The only document I have been able
to find is the data sheet on this page.
https://www.digikey.com/en/products/detail/honeywell-sensing-and-productivity-solutions/LM-HH3AS-H21/5069695
My current electrical diagram has the unit powered off the Main Power
Bus so it should illuminate the LCD numbers when the battery is
switched on. I need to find a home for wire from the enable pin.
My planned ignition system is a SureFly on the left and a Slick mag
on the right. I'm working on a post for the list for a small can of worms
I've opened with that system.
Thanks,
Shawn
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510667#510667
Attachments:
http://forums.matronics.com//files/hobbs_3_873.jpg
http://forums.matronics.com//files/hobbs_2_205.jpg
http://forums.matronics.com//files/hobbs_1_592.jpg
Message 7
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| Subject: | Re: Which Oil Pressure Switch? |
Mudfly wrote:
> I'm having trouble finding a wire diagram for my unit, but guess the enable pin
goes to ground.
Here are the installation instructions for the unit you mentioned. Wiring data
is on the first page. The enable pin is active high.
https://tinyurl.com/386autu8+
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510668#510668
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