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04-12-2018, 08:16 PM
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Join Date: Dec 2013
Location: Baton Rouge, LA
Posts: 1,055
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elbow for oil press switch
I want to install an oil pressure switch at the sender mount fitting. (see page 43-04). I think that I can leave off the 1/8 pipe plug below the oil pressure sensor and use an elbow. The sensor is too fat to just screw right in.
Is an AN914-1D the right thing to use? Anybody tried this and found trouble?
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Ser 104142, RV-14A flying - N1463 
Ser 83825, RV-8 building - N8638? 
USN Ret, Urologist, AME, Repeat Offender
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04-12-2018, 08:43 PM
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Join Date: Mar 2006
Location: Spring Hill, KS
Posts: 365
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Just curious what you plan to use the switch for? Traditionally they are often used to run the Hobbs, but G3X (and presumably all the other EFIS systems) will track engine hours without needing the switch. This eliminates a couple pieces of hardware and a potential failure point that could result in dumping all your oil overboard...
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Mark Navratil
Spring Hill, KS
RV-8A N2D #80583 - built/flew/sold
RV-14A #140017 - wings complete, empacone in progress...
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04-13-2018, 03:16 AM
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Join Date: Dec 2013
Location: Baton Rouge, LA
Posts: 1,055
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I want an EFIS-independent timer. Just something I want I know it is old fashioned.
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Ser 104142, RV-14A flying - N1463 
Ser 83825, RV-8 building - N8638? 
USN Ret, Urologist, AME, Repeat Offender
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04-13-2018, 06:13 AM
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Join Date: Aug 2016
Location: Asheville, NC
Posts: 2,104
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__________________
(2020 dues paid)
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04-13-2018, 07:36 AM
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Join Date: Jan 2005
Location: Ontario, Canada
Posts: 1,544
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While you are at it add a pressure switch for a back up idiot light on the panel. If your screen goes dark sometime at least you will know oil pressure is good to go.
__________________
Tom Martin RV1 pilot 4.6hours!
CPL & IFR rated
EVO F1 Rocket 1000 hours,
2010 SARL Rocket 100 race, average speed of 238.6 knots/274.6mph
RV4, RV7, RV10, two HRIIs and five F1 Rockets
RV14 Tail dragger
Fairlea Field
St.Thomas, Ontario Canada, CYQS
fairleafield@gmail.com
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04-13-2018, 07:38 AM
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Join Date: Feb 2006
Posts: 305
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spacer
If you put a spacer behind the Van's manifold you will be able to screw the oil pressure switch into one of the side ports on the manifold.
Bill Brooks
Ottawa, Canada
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04-13-2018, 07:42 AM
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Join Date: Apr 2012
Location: Collierville, TN (KFYE)
Posts: 1,433
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This may sound a little odd, but when I designed my panel, I installed a Hobbs meter before I knew that the Skyview system tracked engine time, etc. I didn't want to install an oil pressure switch to run my superfluous mechanical Hobbs meter, so I just hooked it up to the alternator field switch power. If the engine is running, the alternator is running, so the Hobbs meter is running. It tracks the Skyview Hobbs meter exactly.
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RV-8 #81077 Super Slow Build
Dynon Skyview HDX, Titan IOX-370, Dual P-Mags, AFP FM200A FI, Whirlwind 200RV CS Prop
First Flight 11/20/2016
www.marksrv8.com
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04-13-2018, 07:45 AM
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Join Date: Jan 2015
Location: Oklahoma City, OK
Posts: 534
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Quote:
Originally Posted by czechsix
Just curious what you plan to use the switch for? Traditionally they are often used to run the Hobbs, but G3X (and presumably all the other EFIS systems) will track engine hours without needing the switch. This eliminates a couple pieces of hardware and a potential failure point that could result in dumping all your oil overboard...
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I also wanted an independent means of tracking time. My RV already had a Hobbs meter in the panel but was unfortunately wired to start running whenever electrical power was turned on ( ie battery turned on). You can imagine the difference in ?hours? that quickly developed. When I bought the RV from its builder the ?tach? time was around 160+ however the Hobbs read over300.
When I checked the log book sometimes tach time was used, sometimes Hobbs and sometimes both. You could literally see the disparity grow over time. I decided to bring them back together. I purchased a new Hobbs meter, an oil pressure switch, ran the Hobbs to match current tach time, and installed both new switch and new Hobbs. Of course I noted in my log book the changes.
Now after a year and a half, time tracking difference is again occurring but it?s less than two hours difference for over 100 hours of use. This difference is due to how both are powered. Tach time begins at 650 rpm and Hobbs begins at sensing of oil pressure. For most Flight tracking I use Hobbs because it?s visible after engine shutdown. For log book entry I use both. However when someone else logs work on my RV I?ve noticed that they usually only record Hobbs - which incidentally was what occurred when the builder owned it. At least now when that happens the two are close to each other and time differences are immaterial.
I also discovered during this process that ?Tach Time? could be changed by just an EIS entry. Hobbs time changes take a lot more time and effort (see above). That?s one reason complete tracking of work in a well maintained set of log books is important. Not all owners keep good log books. Not all aircraft mechanics will turn on power to check tach time when they see a Hobbs meter.
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Jim Harris, ATP, T38, EC/KC-135A/E/R, 2008 RV7A, 2nd owner, N523RM (2015)
Superior XPIO-360, Hartzel CS prop, Aerotronics panel with Dual GRT Horizon WS, EIS, Garmin 340, 335 w/WAAS gps, Dual 430s (non-WAAS), TruTrak 385 A/P with auto-level, Electric trim, Tosten 6 button Military Grips, FlightBox wired to WS, Dynon D10A w/battery backup, 406 MHz ELT. Custom Interior, New TS Flightline hoses, Great POH!
Retired - Living the dream - going broke!
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04-13-2018, 03:57 PM
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Join Date: Mar 2008
Location: Dublin, CA
Posts: 1,261
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Funny I was just thinking about the same thing. I want an low oil pressure idiot light so I want to use the Van's pressure switch. I was also thinking about using the elbow approach. I was also curious whether there would ever be a need to take a manual oil pressure measurement. It that case I might want a Tee instead of a 90. At the moment I'm leaning toward the just using the 90 but I was also wondering if this would separate the oil pressure sender on the manifold and the switch on the 90 far enough apart. I can't really tell without buying the parts.
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Ray Tonks
2020 Donation Paid
Titan IOX-370, Dual PMAGs, 9.6:1 Pistons, FM-150
RV-7 Fuselage in progress
* Cabin Interior - In progress
RV-7 SB Wings
* Both Wings fully skinned
* Fuel Tanks Complete - No leaks finally
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* Flaps Complete
RV-7 Empennage - Complete (a little fiberglass work left)
Vans Training Kit # 2 - Complete
RV-7 Preview Plans
Vans Training Kit #1 - Complete
EAA Sheet Metal Class - Complete
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04-13-2018, 04:57 PM
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Join Date: Apr 2015
Location: Wee Waa Australia
Posts: 279
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You could also put an air pressure switch in your pitot line if your just after air hours.
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Kit 140241
Tail Feathers done
Fuselage kit completed.
wings almost complete.
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Canopy next. Phew!
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