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Thread: oil separators

  1. #1

    oil separators

    Good afternoon,
    We are looking at doing a major overhaul on our IO-360 late fall. One
    partner seems enamored with air/oil separators. I did an online search and
    came up with mostly favorable comments. Anybody on this group have any
    thoughts on this?
    John


    [Non-text portions of this message have been removed]



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  2. #2

    oil separators

    I used to have a C35 Bonanza with one. It worked fine and I had no
    problems with it. I don't know what brand it was. The reason that
    plane had a separator is the only good reason I can think of to have
    one: It had a wet vacuum pump. Wet pumps output a small but steady
    stream of engine oil, so a separator is a must.

    So, if you decide to get a separator, then do yourself a favor and
    install a wet vacuum pump. They don't fail suddenly like a "modern"
    dry pump. Their normal lifespan exceeds the TBO of any engine they are
    mounted on.

    Best regards,

    Steve Robertson
    N4732J 1967 Super III


    --- In musketeermail@yahoogroups.com, "John Waterman" <jwwaterman@...>
    wrote:
    >
    > Good afternoon,
    > We are looking at doing a major overhaul on our IO-360 late fall. One
    > partner seems enamored with air/oil separators. I did an online
    search and
    > came up with mostly favorable comments. Anybody on this group have
    any
    > thoughts on this?
    > John
    >
    >
    > [Non-text portions of this message have been removed]
    >






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  3. #3

    oil separators

    Unless you are getting a lot of oil all over your plane it shouldn't be
    necessary on our models. You woul be better off spending the money at
    time of overhaul on new mags, slick start, lightweight starter or even
    new instead of reconditioned cylinders. Don't skimp on the inside of
    the engine, that is harder to address later, the oil seperator can
    always be easily added. Five years ago when I majored my I0-360 I used
    rebuilt Cerminil jugs instead of spending an additional $2500. Last
    year I had to top the engine, which I did with new cylinders after only
    400 hours. After the engine rebuilder made a contribution of $3,000 it
    still cost me an additionsl $6,000.

    Bob Palamara
    9707L
    '72 Sierra


    --- In musketeermail@yahoogroups.com, "John Waterman" <jwwaterman@...>
    wrote:
    >
    > Good afternoon,
    > We are looking at doing a major overhaul on our IO-360 late fall. One
    > partner seems enamored with air/oil separators. I did an online
    search and
    > came up with mostly favorable comments. Anybody on this group have any
    > thoughts on this?
    > John
    >
    >
    > [Non-text portions of this message have been removed]
    >







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  4. #4
    Guest
    Guest

    oil separators

    Put in the M-20 (I think that's it's name) on my old Sierra and it
    allowed you to run with 8 qts of oil. More oil, more cooling. Didn't
    through out the last quart automatically. Belly stays clean. Was worth
    it.


    John Rutkowski
    Director of Technical Services



    [Non-text portions of this message have been removed]



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  5. #5
    Any curent comments about Oil Seperators? I am considering installing on my sundowner

  6. #6
    I have the M-20 system and a wet vac pump. If you are installing just for the clean belly look, the larger air wolfe system will work better. If you want a wet pump the M 20 system has the pump and all stc's included. If space is an issue, the M 20 is easier placed. Even with the M 20 I still get the little Musketeer drips on the ground and a little oil on the belly. Before the system, the oil would blow back to the tail if I put in 8 qt. Now it just drips. I believe the real advantage is the ability to install a wet vac pump. They have a history of lasting until TBO and you don't need the extra back up instruments or alt vac sources to be safe.

  7. #7
    I had the M20 separator installed about four years ago and have been generally happy with it. As others have said, I can put 8 quarts of oil in the engine and it won't blow out. As I understand it, the M20 is a device to reclaim oil from the crank case ventilation. If you have a wet vacuum pump, I think that there is a better oil separator that would be necessary.
    Mike Nielsen

  8. #8

    air/oil separator

    It has been my opinion that a separator would allow the moisture that is accumulated in the engine oil to be returned into the engine rather than vented overboard thru the breather tube as water vapor. Consider this, as the engine oil reaches it's normal operating temperature, the water that is in the oil turns into vapor, then it is routed to an external alluminum canister which is much cooler than the vapor itself. The result is condensation of the vapor into liquid. The separator would than route the water back into the engine. The weak link in most aircraft engines is camshaft and follower corrosion which is caused by H20, acids, and sitting un-used for extended periods.
    I have overhauled more than a few lycoming engines in the past several years, and 90% of them showed signs of cam lobe and follower corrosion that would have led to failure, or had already failed and produced metal in the filters.
    I have always advised my customers against these add on separators for this reason. I would agree however that a wet pump would require the use of a separator.
    Just my 2 cents

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