---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 04/21/23: 7 ---------------------------------------------------------- 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 _____________________________________ Time: 05:57:27 AM PST US Subject: AeroElectric-List: Re: Which Oil Pressure Switch? From: "Mudfly" 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 _____________________________________ Time: 06:52:45 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 07:06:31 AM PST US From: Charlie England Subject: Re: AeroElectric-List: 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 Virus-free.www.avast.com <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> ________________________________ Message 4 _____________________________________ Time: 07:14:19 AM PST US Subject: AeroElectric-List: Re: Which Oil Pressure Switch? From: "Eric Page" 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 _____________________________________ Time: 08:35:15 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 01:59:05 PM PST US Subject: AeroElectric-List: Re: Which Oil Pressure Switch? From: "Mudfly" [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 _____________________________________ Time: 10:53:25 PM PST US Subject: AeroElectric-List: Re: Which Oil Pressure Switch? From: "Eric Page" 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.