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Thread: At long last - Merc 666!

  1. #141
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    Default Mockup looking good!

    OK everybody,

    The 666 powerhead was mated to the tower for the first time today. The spacer shown is a simple casting pattern to be poured and machined late this week, following a driveshaft will be cut & squared. Meanwhile the distributor bracket and inter-carb linkage will be completed - tomorrow if all goes well. The flywheel and roping plate needs to be turned as well. Next weekend should see final assembly, barely in time for Mark Suter's.........

    Tim
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  2. #142
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    In a word, WOW!

    Jeff

  3. #143
    Administrator Aeroliner's Avatar
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    Default 666

    Hi Tim,
    Engine looks great. Can't wait for the 6 cylinder fest next year. It sure will be a great event. If we can get 8 engines on the water it will be a great show!

    Alan

  4. #144
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    Default Carrb linkage & fuel rail

    You just can't imagine how much time it takes to engineer and build throttle linkage and a fuel system for six carbs. Factory OMC looper choke linkage pieces were scavenged from a "box-o-carbs", hammered into new shapes, and now serve as inter-carb linkage. As noted before, a trick to mounting carbs close together was to reverse the port side butterfly shafts. Careful planning and delicate rework was involved. Be aware you MUST grind the protruding, swaged portion of the screw from the back side of each butterfly screw or they simply break off upon removal! One butterfly shaft was ruined in the process. The throttle pulls were made from bicycle brake cable & housings. The cables will be terminated together at the dead-man cable attach point low on the port side of the engine.

    Fueling six carbs with three pumps looked at first to be a plumbers nightmare. After several scenarios were sketched, it was decided to use one main fuel inlet to feed the three pumps (and the primer yet to be mounted; the pumps in turn feeding six carbs. But how to make sure all are fed evenly? Elementary: A vertical fuel rail was gun drilled, machined, and attached as shown. Pumps feed the common rail from the top, middle, and bottom. Carbs are then fed by individual equal length hoses spaced in between. Fittings are due in tomorrow, with hoses to follow. It's sure to look interesting, especially once the primer and its hoses are fitted!

    Tim
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    Last edited by Tim Kurcz; 10-09-2012 at 10:02 AM. Reason: Add content

  5. #145
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    BTW: It's been a wild race to build the 666 in time for Mark Suter's October 20 show. We will make it - but just barely! Many thanks to all of you watching, offering your engineering insight, and words of encouragement. You'll all see images of the finished rig late next week, or after the show if I'm late on the clock.

    As winter is closing in quickly, you'll have to wait until next spring to see/hear the video. Also, the IOA has agreed to host at least one special event for Merc sixes (stock, mod, and alky) at Hillsdale next year - they race there late spring and late summer. You'll want to attend this event. Stay tuned!

    Tim

  6. #146
    Team Member BJuby's Avatar
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    I was looking forward to seeing how you were going to accomplish the throttle linkage. Very clever and professional looking.

  7. #147
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    Default Challenges to be overcome

    Quote Originally Posted by BJuby View Post
    I was looking forward to seeing how you were going to accomplish the throttle linkage. Very clever and professional looking.
    Thanks, but it's not done quite yet. All my race engines use push-to throttle actuation for safety. That way closure is not totally dependent in springs: You can forcefully pull the throttle handle back to close the throttle should the Bowden wire bend. The 666 is obviously a pull-to, so a reversing arm must be designed and built. Hopefully in the next few days.

    Tim

  8. #148
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    Default Powerhead spacer

    Here are images of the simple pattern ready for the casting foundry - it was sent today. The trick is to make it big enough to compensate for 1/64" shrink per inch including a 2-3 degree draft angle cut into vertical surfaces that allows removal from the green sand mold.

    If all goes according to plan, the raw casting will arrive Fri-Sat for machining this weekend. Time is running out: The flywheel, roping plate, and distributor bracket need to be machined and fitted. Oh yeah, it might be nice to assemble the powerhead!

    Tim
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  9. #149
    Richard Sacher curbman's Avatar
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    Looking good Tim

  10. #150
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    I'm in just total AWWWWWWWW amazing what man can build.

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