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914UL Low Oil Press Switch (LOP)

in 912 / 914 Technical Questions 6 years ago

  • Re: 914UL Low Oil Press Switch (LOP)

    by » 6 years ago

    I'm not having any joy finding a banjo eye fitting that would be suitable for mounting the FEP low oil pressure switch, so I've changed track a bit, planning on using a couple of barb fittings as follows:

    Purchase from Rotax, 1 each 956314 Hose Nipple 4/6 and 1 each 963143 Idle Jet 35, and also purchase 1 each barb to M12x1.75 threaded (female) fitting. Plumb the fittings together with 6mm ID oil/fuel hose and Oetiker clamps. Secure the LOP switch and nipple to the gearbox case using an adel clamp. The idle jet plug will prevent excessive oil loss in case there is a leak or failure of the LOP sensor or of the short interconnecting hose.

    Any other suggestions would be appreciated.

    Cheers,
    pmelby

    IPC Ref. 73-10-00, Items 56 & 57
      
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  • Re: 914UL Low Oil Press Switch (LOP)

    by » 6 years ago

    If I recall they move the temp sensor to the Oil Tank.
    The Oil tank has a temperature closer to the Oil in the Engine than the port next to the Oil Filter.
    The oil tank has oil in it that just left the Engine. Hotter Oil.
    The Oil Pump has oil in it that just returned from the Oil Cooler. Cooler Oil.
    The temperature difference is minimal in real life situations because of the rate that the oil circulates.
    An Analog gauge cannot resolve the temperature difference.
    The entire Oil Volumes circulates in well under a minute.
    The Oil cooler only reduces the Oil temperature a few degrees on each pass.

    You are adding a dozen more possible points of failure for no real advantage.
    You are even designing it expecting a failure.

    The oil temperature sender mounted to the Oil Tank has been considerd in the design of the Gyro to be an acceptable location.
    If it "ain't" Broke, Don't fix it!

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

      
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  • Re: 914UL Low Oil Press Switch (LOP)

    by » 6 years ago

    Many installations have the oil pressure sender remote mounted (firewall) due to the damaging effects of heat and vibration which has caused a high failure rate, Dynon even specifies this in their installation manuals. You could then Tee in the LOP switch.
      
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  • Re: 914UL Low Oil Press Switch (LOP)

    by » 6 years ago

    My kit does not have the oil temp fitting on the oil tank, so moving the temp sensor there is a no-go. Also, there are no provisions to locate the oil temp sensor on the thermostatic valve. I'll be satisfied with the temp sensor on the oil pump as this is the temp of the oil being delivered to the bearings/heads. Regarding the LOP, I'll attempt to make the installation airworthy, if I am unable to, I'll then defeat the panel indicator light and just rely on the analog oil pressure indication.

    Thanks for the replies, cheers,

    pmelby
      
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  • Re: 914UL Low Oil Press Switch (LOP)

    by » 6 years ago

    There is an AutoGyro group on the Rotary-Wing Forum.
    You might try asking what others have done?

    The Oil Port on the tank is just a 10mm nut brazed over a hole drilled in the side of the tank.
    Not a difficult feature to add.

    Instead of adding all that extra plumbing, consider taking the Barbed banjo fitting and cutting off the barbs an then just taping a 10mm thread in the hole where the barbs used to be.
    The simplest solution is often the best.
    The KISS principle.

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

      
    Report
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