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Oil line pressure

in 912 / 914 Technical Questions 7 years ago
Am curious as to what pressure/vacuum can be expected in the flexible flow and return oil lines to the pump and return from the sump. I believe it's a vacuum to the pump and guessing it's just a few PSI back from the sump?

  • Re: Oil line pressure

    by » 7 years ago

    Rotax 914 Installation Manual says hoses must be rated for 145 psi pressure. It also says that, measured a maximum distance of 100 mm from the pump inlet, vacuum must be tested to not exceed 4.35 psi. Apparently actual pressure and vacuum will vary depending upon the installation.
      
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  • Re: Oil line pressure

    by » 7 years ago

    The case pressure is approximately 4-5 psi at full power.
    The vacuum is normally -2psi. It should not exceed -4.35 psi. If it does you have a restriction (maybe wrong fittings, collapsing hose, too small ID.)
    This info can be found in the installation manual "Checking the oil circuit". This test should be completed by the OEM.
      
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