Elto RBM

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  • bobw
    bobw

    US Member - 1 Year
    Replies: 1130
    Topics: 41
    #218282

    It surely deserves two thumbs up, both for the effort in putting it together and for the final result – great looking motor!

    Bob

    1954 Johnson CD-11
    1956 Johnson RD-18
    1958 Johnson QD-19
    1959 Johnson QD-20
    1957 Evinrude Fastwin 18

    "Every 20 minute job is only a broken bolt away from a 3-day project."

    Buccaneer
    Buccaneer

    US Member - 1 Year
    Replies: 4157
    Topics: 989
    #218374

    I picked up the subject motor today and did a quick check, and here’s
    what I know…….

    The transom screws say “Elto”.

    The lower unit looks different than my 1925 Elto Light Twin Lightwin model “C”,
    therefore I have no idea what year the lower may be.

    On the powerhead crankcase base is the serial? number 4220136

    It has a tillotson MB2A carb, butterfly controlled with a short piece of
    throttle cable.

    There’s a casting number on the timer showing 100937,
    and I see no advance lever to move the timer, nor anyplace
    one would go.

    The appears to be a homemade adapter plate, barely noticeable, between the lower unit
    and power head, but everything else appears like it fit without alteration.

    If it ever did run, it appears to be a very old “remodeling job”!

    All information on what I have greatly appreciated!

    DSCN9530

    DSCN9533

    DSCN9535

    DSCN9540

    Prepare to be boarded!

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    lyks2tinkr

    US Member - 2 Years
    Replies: 351
    Topics: 42
    #218381

    The power head is a Model 422 which makes it a 1932 Elto Super A rated at 11.5hp.
    The leg to me looks like a hybrid of 2 Ruddertwins.
    The timer may have had the handle removed for a remote advance of some type.
    Here is a picture of my Super A for comparison.
    I really like the looks of this Super Elto Frankentwin

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    Buccaneer
    Buccaneer

    US Member - 1 Year
    Replies: 4157
    Topics: 989
    #218389

    Thank you Mr. Tinkerer! This helps a lot.

    In looking at my photos again, it looks like there may have been
    a handle on the timer, but perhaps cut off, with a big set screw
    put in it’s place to lock the timing???
    I could not rotate the timer at all, so it may be locked in place.

    My 1925 Light Twin / Rudder Twin does not have the “flat foot”
    on the skeg like this one. Hopefully someone can further ID the LU year(s)

    Looks like a fun project!

    timer-handle

    Prepare to be boarded!

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    Buccaneer
    Buccaneer

    US Member - 1 Year
    Replies: 4157
    Topics: 989
    #218394

    I found a photo online of a 1926 Elto Super G Rudder Twin lower unit.
    Looks like the LU on my Frankenstein motor.
    Not sure if that same style LU carried on to later years?

    Lower-Unit-Comparrison

    Prepare to be boarded!

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    eltoquad

    US Member - 2 Years
    Replies: 217
    Topics: 49
    #218423

    In your photo with red arrow pointing to set screw, that screw is for tension of timer. The handle would have been attached on the flat where wire is shown to be attached. I think there should be two holes drilled and tapped on that flat for timer handle.

    Buccaneer
    Buccaneer

    US Member - 1 Year
    Replies: 4157
    Topics: 989
    #218434

    In your photo with red arrow pointing to set screw, that screw is for tension of timer. The handle would have been attached on the flat where wire is shown to be attached. I think there should be two holes drilled and tapped on that flat for timer handle.

    Thanks for solving that mystery. Any idea what make of timer it is?

    Prepare to be boarded!

    Tubs
    Tubs

    US Member - 1 Year
    Replies: 3233
    Topics: 175
    #218439

    You're only as smart as the person you're talking to.

    Buccaneer
    Buccaneer

    US Member - 1 Year
    Replies: 4157
    Topics: 989
    #218448

    Thanks Tubs, your photo explains the handle mystery.
    Did Elto / OMC make their own timers for these power heads?
    If I can’t figure out how it “tics” I’ll look for some literature on them.

    Prepare to be boarded!

    Tubs
    Tubs

    US Member - 1 Year
    Replies: 3233
    Topics: 175
    #218465

    You're only as smart as the person you're talking to.

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    eltoquad

    US Member - 2 Years
    Replies: 217
    Topics: 49
    #218477

    The mechanism inside might be made by Atwater Kent but it’s nothing like the Rudder twin set up. It’s more of a standard type set of points. Timer can be set to where points will never close. This will of course kill the motor and also prevent battery from running down while motor isn’t running.

    Buccaneer
    Buccaneer

    US Member - 1 Year
    Replies: 4157
    Topics: 989
    #218501

    The mechanism inside might be made by Atwater Kent but it’s nothing like the Rudder twin set up. It’s more of a standard type set of points. Timer can be set to where points will never close. This will of course kill the motor and also prevent battery from running down while motor isn’t running.

    Sounds like the timer has a handy “battery saver” option, but suppose most battery boxes were rigged up with
    a knife switch?

    Prepare to be boarded!

    Buccaneer
    Buccaneer

    US Member - 1 Year
    Replies: 4157
    Topics: 989
    #218703

    I tore into the 1926 / 1932 Elto Super A /Rudder Twin today.
    If this contraption ever ran or powered a boat, it was a long
    time ago.

    Some of the mods to make the Super A power head fit on
    the G Rudder Twin lower appear to be
    the bottom of the Super A exhaust chamber / muffler to
    allow the Rudder Twin lower to mount.
    DSCN9579

    No sure what the Super A water outlets originally looked
    like exiting the muffler, but appears some mods were made here.
    DSCN9576

    It appears a plate was welded to the transom mount to adapt
    the powerhead to the L.U.
    DSCN9583

    Were the big brass terminal connectors
    original to these coils?
    Does the military style coil (for twins) work okay for a retrofit
    in these coil housings?
    DSCN9575

    Prepare to be boarded!

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    Buccaneer
    Buccaneer

    US Member - 1 Year
    Replies: 4157
    Topics: 989
    #218709

    I forgot to mention, that I have a 1930 Elto Senior Speedster with a bad crankshaft…..
    wonder if this Super A power head would fit on the Senior’s lower unit???

    Prepare to be boarded!

    Avatar
    lyks2tinkr

    US Member - 2 Years
    Replies: 351
    Topics: 42
    #218724

    The Senior speedster has a much bigger power head than the super A and would doubt they would be compatible.

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