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Boost gauge on 914 unreliable - Fixes?

in 912 / 914 Technical Questions 10 years ago
Hi there,

My boost gauge has always been all over the place since I got the MTO Sport at 130 hrs. Constant pitch prop on so not that important, however if it is in - I want it to work properly.

Anyone experienced this or have any remedies, fixes or tests I can attempt?

Thanks, Bud.

  • Re: Boost gauge on 914 unreliable - Fixes?

    by » 10 years ago

    Is a boost gauge the same as a manifold pressure gauge ?

    If you are talking manifold pressure ,What type of gauge and sensor ? where is it plumbed into ?

    It could possibly be that you require restricting the line going to your sensor, I have heard of people needing this to keep their gauge needle from jumping all over .

    And there is always looking at the wiring, especially if a ground is used.
    Thank you said by: Vaughan Felton
      
    Report

  • Re: Boost gauge on 914 unreliable - Fixes?

    by » 10 years ago

    Thanks Kevin. Yes we are talking manifold pressure. It is plumbed into the compensating tube connecting the carbs.

    The restricting sounds like an easy first check - any idea how they did that?

    Just a standard gauge that shows 35 inches at 880 elev. prior to start.
      
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  • Re: Boost gauge on 914 unreliable - Fixes?

    by » 10 years ago

    I installed my manifold pressure gauge myself.

    I have a Dynon 100 efis and Dynon 120 ems , used the MP sensor from Dynon.

    I also plumbed into the carb balance tube , ran a line to the sensor, I put a piece of brass stock with a small hole in it in the MP sensor line. The brass stock is about 1/2" long and fits tight in the MP sensor line, it is larger than the nipple connections on either ends so it cannot go anywhere.

    I never tried my gauge and sensor without it, did research before installing and thought it was a good idea to put it in at initial install. The readings are steady :)
    Thank you said by: Vaughan Felton
      
    Report

  • Re: Boost gauge on 914 unreliable - Fixes?

    by » 10 years ago

    Any easy way to dampen a MAP gauge pulsation is to put a Bing idle jet in the line. It's just a restrictor. It makes the gauge smooth in its readings.

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

    Thank you said by: Vaughan Felton
      
    Report
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