fbpx

 

Is it true that the factory does an initial run-up/break-in of all four stroke engines?
If so, do they mount a prop for this procedure, or is some other device providing the load?

The reason I ask is, under magnification, I can see no evidence of anything ever being mounted on my prop flange.

  • Re: Factory initial start?

    by » 4 months ago


    All the 9-series are test run and break-in on a dyno.


  • Re: Factory initial start?

    by » 4 months ago


    Thanks Rob. 


  • Re: Factory initial start?

    by » 4 months ago


    The engine has definitely been run before you received it.
    When you get to the part where you remove the plug from the bottom of the Oil pan to attach the Return Oil hose;  Be prepared for 4-8 ounces of Oil to drain from the engine.
    You will notice that this Oil does Not look brand new, out of the bottle.
    It will look slightly used confirming that the engine has some time on it.


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.


  • Re: Factory initial start?

    by » 4 months ago


    Ok, I’ll have my drain pan in place! Thanks Bill!


  • Re: Factory initial start?

    by » 4 months ago


    Hi Michael

     

    Just to round out your question on the initial run.  All 9 series are put on an Eddy Current dyno.  They are mounted to the dyno with a rubber coupler, torsional coupler, rather than a propeller.  The power generated is recovered for use in the plant.  The run time is between 30 to 45 mins on average.  This hot test of the engine is to proof assembly and function of the engine rather than break-in of parts.

    The design of the engine, ring composition and cylinder wall coating, allows for sufficient sealing without long break-in time.  There is no requirement for special oil or run profiles once installed in your aircraft.  That said there will definitely be some wear-in especially in the first 100 hours.  The 25 hour inspection, which includes oil and filter change, will pick up most of the wear from initial assembly.  The next few 100 hour inspections will normally drop out all the balance of assembly lubes and polishing in of bearing seats and bushings.  

    The completed test runs and keep on a filemaker file at the factory as a permanent record and available on special request if there was any question of initial assembly.  The power runs are stepped and output must meet the standards for that engine type to be released to sale.  

    here is an old video from Avweb and at about 6 min in you will see the dyno....

    https://www.avweb.com/ownership/video-how-rotax-builds-aircraft-engines/

    Cheers


    Thank you said by: RotaxOwner Admin

You do not have permissions to reply to this topic.