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Thread: At long last - Merc 666!

  1. #51
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    Default Reed boxes

    Quote Originally Posted by Fastjeff57 View Post
    Slick! Will you make the reed holders as well?

    Jeff
    Nope; too much delicate work. They are early versions of the OMC loop triple 6-petal boxes, truncated to make petite, perfect pyramids. Images will be posted next week.

    The goal in this and most of my projects is to use the greatest number of proven off-the-shelf parts to keep cost and machine time down. No need to reinvent the wheel.

    Many operations are needed to make the 666, but short of the castings, most are extensions of pre-existing technology, practically guaranteed to work.

    Tim

  2. #52
    Team Member JohnsonM50's Avatar
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    Quote Originally Posted by Tim Kurcz View Post
    Nope; too much delicate work. They are early versions of the OMC loop triple 6-petal boxes, truncated to make petite, perfect pyramids. Images will be posted next week.

    The goal in this and most of my projects is to use the greatest number of proven off-the-shelf parts to keep cost and machine time down. No need to reinvent the wheel.

    Many operations are needed to make the 666, but short of the castings, most are extensions of pre-existing technology, practically guaranteed to work.

    Tim
    Excellent building Tim, an inspiration to RaT motor techs on any level.

  3. #53
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    Default Big & little brothers

    Just realized an opportunity for you to compare unfinished 2009 work with 2012. Here is the semi- completed 666.1 with the mostly completed 444.3. The reed plate and pyramid reed boxes are shown in great detail. After final machining, both will be bonded/bolted in prep for final assembly. Enjoy.

    Tim
    Attached Images Attached Images     

  4. #54
    Team Member JohnsonM50's Avatar
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    Quote Originally Posted by Tim Kurcz View Post
    Just realized an opportunity for you to compare unfinished 2009 work with 2012. Here is the semi- completed 666.1 with the mostly completed 444.3. The reed plate and pyramid reed boxes are shown in great detail. After final machining, both will be bonded/bolted in prep for final assembly. Enjoy.

    Tim
    On the 444 you switched the port carb linkage to the outside?

  5. #55
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    Default Carb spacing

    Quote Originally Posted by JohnsonM50 View Post
    On the 444 you switched the port carb linkage to the outside?
    Good observation. Butterfly shafts were reversed on the port carbs to allow closer spacing. This allows the smallest possible displacement angle to maintain the closest to straight in mixture flow.

    Tim

  6. #56
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    Default More from the brothers

    These images should answer a few more questions. Front end machine work continues on the 666 this weekend. Reed valve reliefs will take hours of careful layout and millwork to keep crankcase volume tight. Enjoy!

    Tim
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  7. #57
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    Default reed cages

    Tim' are these mercury cage's or omc ?

  8. #58
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    Default Modified OMC cages

    Quote Originally Posted by byrdsperformance@tds.net View Post
    Tim' are these mercury cage's or omc ?
    Hi Mike,

    Those are OMC loop triple cages. These are the early style with large screw attach points. To convert them, aluminum 10-24 screws are installed with high strength Loctite and allowed to cure. Then the cages are milled into pyramids. Finally, the attach holes are re-located, drilled and tapped. A lot of delicate work!

    Tim

  9. #59
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    Tim:

    I have a few of those OMC cages 'hanging around' if you need them.

    Jeff

  10. #60
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    Default OMC cages

    Quote Originally Posted by Fastjeff57 View Post
    Tim:

    I have a few of those OMC cages 'hanging around' if you need them.

    Jeff
    Thanks Jeff. Will check inventory this weekend and get back to you.

    Tim

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