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Oil Analysis

in 912 / 914 Technical Questions 7 years ago

  • Re: Oil Analysis

    by » 7 years ago

    You both should be using Decalin. Almost everyone I know uses Decalin when they have to use 100LL..

    http://www.aircraftspruce.com/catalog/appages/Decalin.php?clickkey=11444

    p.s
    Fixed typo. :lol:

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

      
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  • Re: Oil Analysis

    by » 7 years ago

    I agree Roger the issue is that a quarter of decalin will cost to us Brazilians something around $ 200 because of shipping and the absurd taxation that we have here.
      
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  • Re: Oil Analysis

    by » 7 years ago

    Hi Roger , i was wondering if you have some data on lead of other samples in 100% AVGAS use.
    At least we can compare with my sample to see if other in the same situation have same results.
    Thanks,
    Arnaldo
      
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  • Re: Oil Analysis

    by » 7 years ago

    Hi Arnaldo,

    I don't save any analysis. Usually the client keeps them.
    I see oil analysis reports all the time. Most of my clients us 91 oct. unleaded auto fuel so they rarely see leading. The ones that I do see that use 100LL all have elevated levels of lead. Most labs use hundreds of if not thousands of samples from other same type engines and compare them to the same type engine with the same time on it. Many labs may run the sample through 3 times. If a lab sees thousands of test come through and most use 91 oct unleaded fuel then the few that come through using all 100LL will be compared to those which will have the extra lead. If someone just uses a 1-3 tank fulls of 100LL after a trip that usually uses 91 oct. unleaded and then does an oil change and an oil analysis then they might show more lead vs other times.

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

      
    Report

  • Re: Oil Analysis

    by » 7 years ago

    Browse through the sample reports here.

    https://www.blackstone-labs.com/search.php?Keywords=sample%20report

    Lycoming and Continental engines burning Leaded Gas 100% of the time average 5000ppm of lead.
    Automotive engines burning 0% lead average <25ppm.

    Your 1400ppm Lead is a low number if you have been using 100% leaded fuel.
    This might indicate that the piston seals are doing very well in keeping the combustion products out of the oil.

    Your report indicates that they were expecting a number very close to Zero; typical in the modern automotive world.
    Your 1400pm is flagged as high only because they are comparing an aircraft engine to their average car engine.

    An elevated Lead level is to be expected and is perfectly normal if you are burning leaded gas.
    You do not have a problem!

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

    Thank you said by: Arnaldo Pessina, RotaxOwner Admin
      
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