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Is there a sender other than the VDO that will work with a GRT EIS?  

  • Re: Oil pressure sender

    by » Yesterday


    There is nothing special about the senders.
    The sender is a variable resistor.
    Zero  = 10 Ohms,  Max = 184 Ohms.
    Max could be either 5 bar(80psi) or 10 bar(150psi).  
    10 Bar is more common.
    As long as the Resistance and Max range match, it should work.
    - - -
    Why do you think you need a new sender?
    What do you have against VDO?
    No matter what brand name is on the case it was likely made in the same factory.
    Aircraft Price = $60
    Auto Parts Price = $40
    eBay price = $30.
    - - -
    Pay attention to the threads!!!
    1/8 NPT and M10x1 look almost identical and are easily cross threaded.
    Rotax has changed the threads on the Oil pumps over the years.
    Be sure you know which one you have.


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Bill.Hertzel@Yahoo.com
    Clicking the "Thank You" is Always Appreciated.


  • Re: Oil pressure sender

    by » Yesterday


    Bill -- Has does one determine what kind of threads (e.g., 1/8" NPT vs. M10x1) are used on their specfic 912's oil pressure port?  Is it listed somewhere in the engine's spec sheet or does one need to get a thread guage?


  • Re: Oil pressure sender

    by » Yesterday


    I would measure them. (Carefully)

    The M10 x1 is 10mm(0.394") in diameter for the length of the straight threads with 1 thread per mm (25.4 threads per inch).

    The 1/8 NPT is a tapered thread startiing with ~ 9.9mm( 0.390") at the end and widening to ~10.3mm (0.405") further up the thread.
    The 1/8 NPT is 27 threads per inch (~1.06 threads per mm).

    So you can see that they are within 0.01" of each other and easily confused.
    Measuring the diameter at  two locations about a 1/4" apart should reveal the difference.
    Same Numbers = M10;   Different numbers = 1/8 NPT.

    Carefully attempting to thread them in will also reveal the difference.
    Both will start to thread into the other for a few turns.
    If you feel binding after 2-3 turns you have the wrong threads.  Stop!!!

    The M10 is the more recent and common Rotax thread.
    1/8 NPT to M10 adaptors are readily available from the Automotive World as most newer engines are Metric and most replacement Senders are NPT.


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Bill.Hertzel@Yahoo.com
    Clicking the "Thank You" is Always Appreciated.


    Thank you said by: David HEAL

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