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Thread: Skipper Oil Consumption/M20

  1. #1

    Skipper Oil Consumption/M20

    Bob, seven hours per quart should be fine. You can calculate your max allowable consumption based on Lycoming Service Instruction SI1427B, dated February 8, 1993. You can download this SI free from both Lycoming and the BAC website. It is a .pdf file. The basic formula is:
    .006 times horsepower times 4 divided by 7.4
    If you are operating at 100 HP, it works out to roughly three hours per quart; or four hours per quart at the 85 HP level.

    The M20 works fine to help keep the belly cleaner, IF it is installed exactly as instructed. Unless
    you are seeing puddles of wet oil under the plane, the M20 is unlikely to significantly reduce oil consumption. It usually WILL allow you to keep the sump pretty much full without the top quart or two getting rapidly "blown out", as opposed to just keeping the oil level lower in the sump.


    ----- Original Message -----
    From: rgresli
    To: musketeermail@yahoogroups.com
    Sent: Friday, April 29, 2005 3:34 PM
    Subject: [musketeermail] Skipper Oil Consumption/M20


    Musketeer Group,

    What is the typical oil consumption for the Lycoming O-235-L2C in the
    Skipper?

    My oil was changed abount 7 hours ago and it is now down a little
    over a quart. They put in 100W. It was at about 5.3qts and 7 hours
    later it's right at 4qts. The Skipper POH says no more than 6 and no
    less than 4 in the engine.

    My engine was top overhauled last year about 60 hours ago. It was
    running on Mineral Oil for the first 53 hours before my oil change.

    My mechanic says that maybe the rings are still seating and I should
    run it hard for awhile. However, he also said the rings may have
    seated as much as they are going to by now.

    I have an M20 Air/Oil Separator that I'm thinking of installing in
    the Skipper. I'm hoping this would help reduce oil consumption and
    keep the underside cleaner. M20 also claims that their unit will
    extend my engine life. What are your experiences with the M20?

    Thanks,

    Bob Gresli
    Skipper 6636E
    Hillsboro OR (HIO)

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



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  2. #2

    Skipper Oil Consumption/M20

    --- In musketeermail@yahoogroups.com, "rgresli" <FlyBE77@c...> wrote:
    > Musketeer Group,
    >
    > What is the typical oil consumption for
    >the Lycoming O-235-L2C in the Skipper?

    Prabably there's an acceptable range & will vary. Don't
    know much about the little Lyc myself.

    > My oil was changed abount 7 hours ago and it is now down a little
    > over a quart. They put in 100W. It was at about 5.3qts

    I'm assuming from around 6.5..On a bigger Lyc (0-320-60) she'll take
    8, but more than 6 ends up on the belly.

    > and 7 hours
    > later it's right at 4qts.

    Little over a quart in 7 hours at ~ 60 hours after a top job, seems
    OK to me & might still change.

    Lyc IO-360 likes a quart in 5, but may mean nothing to do in
    comparing to a small Lyc.

    > The Skipper POH says no more than 6 and no
    > less than 4 in the engine.
    >
    > My engine was top overhauled last year about 60 hours ago. It was
    > running on Mineral Oil for the first 53 hours before my oil change.

    Engine can take some hours to adjust

    > My mechanic says that maybe the rings are still seating and I should
    > run it hard for awhile. However, he also said the rings may have
    > seated as much as they are going to by now.

    I'd agree, but lean more toward rings having taken a set.

    > I have an M20 Air/Oil Separator that I'm thinking of installing in
    > the Skipper. I'm hoping this would help reduce oil consumption and
    > keep the underside cleaner.

    Don't know much about the M20. Bound to be a bunch of blow by during
    break in though (smearin the belly) & should go away. I'd sit tight &
    see what develops.

    > M20 also claims that their unit will
    > extend my engine life.

    IMO, sounds like a sales pitch..Jon

    > What are your experiences with the M20?
    >
    > Thanks,
    >
    > Bob Gresli
    > Skipper 6636E
    > Hillsboro OR (HIO)





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