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Oil Pressuer Difference Dynon EMS 120

in 912 / 914 Technical Questions 8 years ago
I am fitting a Dynon EMS120 and connecting a 912 UL all has gone perfectly until we connected the oil pressure sensor which is the original one (photo) the cranking oil pressure with the old pressure gauge is 4 bar with the Dynon connected we are getting 5.6 bar so we are thinking we need a resistor? Or are we missing something?
13112568_1235355033156490_278380319_o.jpg (You do not have access to download this file.)

  • Re: Oil Pressuer Difference Dynon EMS 120

    by » 8 years ago

    Hi Jeremy,

    It could be that high on a cold first start and should lower as it warms up.
    If it does stay that high I would ask the resistor question on the Dynon forum. There is a couple of resistors for the D120. The other thing to look at is make sure you have the proper numbered sensor selected in the D120. It is in setup under the oil pressure and at the bottom of the righthand column and allows you to select different numbers for sensors.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
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  • Re: Oil Pressuer Difference Dynon EMS 120

    by » 8 years ago

    Dear Roger thanks for the info.
    In the setup we selected Rotax 912 and then selected number 1 in the list of oil pressure sensors, our engine is pre 2008, so number 1 is good. We cannot see any marks on the sensor that is fitted just what is in the photo. Can you determine if this is the correct sensor from the photo? Not sure if someone changed it prior to us fitting it. We have tried cranking only with both gauges, the original gauge is showing 4 bar during cranking and the ems is showing 5.6 bar. I am asking Dynon and they have said the same as you. So it leads me to 1 the Sensor is not the correct one or we need a resistor.
      
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  • Re: Oil Pressuer Difference Dynon EMS 120

    by » 8 years ago

    Jeremy,

    The numbers for the sender are on the nut at the base of the sender. I have attached a picture that shows mine is model 30/23 and is 0-80 PSI. Searching for VDO oil sender 30/23 I get the page VDO page at this link which shows the particulars. http://www.vdo-gauges.com/pressure-sender-80-psi-warning-contact-7-psi-1-8-27npt-30-23.html

    I notice your wk terminal is grounded, this is warning contact. In my application it provides a ground to a red light on the panel which lights when oil pressure drops below 7 PSI.

    I do not believe your sensor with the warning terminal is OEM original to the ROTAX.


    IMG_0105.JPG (You do not have access to download this file.)
      
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  • Re: Oil Pressuer Difference Dynon EMS 120

    by » 8 years ago

    Since your picture is of a VDO sensor I take it you use the 1/8" x 27 NPT threads. Your sensor does look like it has a little time and possibly internal wear on it. If you have the M10 threads then make sure that's what you get.

    These two VDO senders are the most common.360-430 0-150 psi double pole like yours.
    The 360-004 0-150 which is a single pole unit is also used. Both these sensors have 1/8" x 27 NPT threads.

    I get mine at "Egauges".
    http://www.egauges.com/150-PSI-10-Bar-10-180-Ohms-VDO-Pressure-Senders-s/23222.htm

    The 360-004 0-30 psi double pole 1/8" x 27 npt is a common fuel pressure sensor.

    Off course you can always go to the new style sensors that come on the newer engines.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
    Report
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