Oil line pressure

by Roger Sutherland in 912 / 914 Technical Questions 6 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 Ken Ryan » 6 years ago

Ken Ryan

28 360 928

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 Rob Seaton » 6 years ago

Rob Seaton

3 1.32k 240

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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Oil line pressure

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