Thread: Building A looper Beast

  1. #71
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    Default 12 pack?

    Hey Dick,

    The OMC 2-bbls are installed on 4.000" centers top to bottom. Not sure about the Merc's, but have a request out to a friend with a 120 motor.

    What is your cyl-to-cyl centerline distance? Have you given any thought about the 12-pack?

    Tim

    PS Will gladly send a carb or two for fitting purposes (not sure if I have six).

  2. #72
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    Default 12-pack possibilities

    Hey Dick,

    Jim Robb measured 4-1/2" carb centers on his 2.5l 120 motor, with space to burn. If your bore centers are 4.00 or more, 2-bbls are possible! For reference, the OMC Mod-50 uses three 2-bbls with 1.000" venturis. Here's what the front half of your "Beast" might look like!

    Tim
    Attached Images Attached Images  

  3. #73
    Team Member R Austin's Avatar
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    Not had much time for replys but will try to catch up. Nice photo work on the 12 pac look. Wish the real thing was that easy. The carb centers are only 3.406", not leaving much choice for options. That is why the TIIX carbs have cut bowls. The only option will be to use diaphragm carbs if the conversion becomes a problem. Work continues, just not had time to upload pics. Maybe can do that tomorrow. Heads are almost complete. Just need to finish cut chambers and do plugs. Had to make a riser for setting up the front for line boring.

    Picked up the last of the castings and machined the coil holders, they are ready to mount on the heads when they are completed. Will try to weld up the front cover tomorrow for modifications required for new style reed cages.

  4. #74
    Team Member R Austin's Avatar
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    The following pics are more head work. The first two are a fixture I made to align the combustion chamber pockets for positioning the head referenced to the chambers. The two discs are spring loaded with spring washers from the Mercury rewind starter. With the head placed over the fixture, they are compressed into the chamber centering it. The bolt holes are relieved and the four edge trim areas are relieved for milling and drilling. The fixture has a rail on the bottom that aligns it to the X axis of the mill table.. Then center with a center finder to the center of the fixture. The head is symmetrical form the center and with the digital read out and a print it goes quickly and is repeatable for each head. The third pic shows the disc mark in the bluing ( red in this case) left by the disc as it was compressed into the chamber. The balance of pics are just milling and drilling.Name:  IMG-20121028-00756.jpg
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  5. #75
    Team Member R Austin's Avatar
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    While I am at it I will just dump the rest of the info to date. Which will create a lag in new data because I will have to accomplish more work to add.
    Following pics are of the recently cast coil holders that attach the coils to the side of the heads. Not any place else to attach with the exhaust coming from each side of the block and the front being consumed by the starter and the switch boxes. Two per head, one on each side.

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  6. #76
    Team Member R Austin's Avatar
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    While being almost ready to line bore the case on my old 1910 converted lathe, I needed to build a riser for the carriage. It has a table now for line boring the Merc 60 and 66 inch blocks. Not wanting to disturb that set-up it was back to the computer and laser to cut out an interlocked puzzle of plates to weld up a riser. After welding I had it blanched both side to the right thickness and paralleled. The bolt and dowel pin holes were all pre-cut by the laser. The laser can hold with in a couple thou in size. Holes were all undersized to allow for weld distortion and plunging for clean up with an end mill to recenter as a drill would bend and try to follow an off center hole. Drilled, taped and checked with part. Ready for line boring.
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  7. #77
    Team Member R Austin's Avatar
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    And for those of you that think this should just be a copy of the Quincy Looper with the standard three carb front and the third ported block, I add the following pics. This will of course mean that I have to pattern the block for casting this winter as I will not cut another from billet. It will also require moving the starter bracket for carb clearance before line boring. I will use the steel four petal reed cage/bearing from the three cylinder direct charge 650- 700 motor. Also I have included pics of the TIIX front carb set-up. NOW you know why there were two sets of castings made.

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  8. #78
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    best thread ever!!! Thanks for posting the amazing work you are doing!!!
    Daren Goehring
    63-R
    DSH, 500ccmh, 750ccmh


  9. #79
    kraazyboat
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    I think that what you have done. And the time of posting has been very fun to read. And wait to read and see as time goes on IS SO WELL WORTH THE TIME. As for what Tim K. has done and the input to the board. KEEP UP THE GOOD WORK GUYS. Dave

  10. #80
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    This thread "Makes my day!"

    Jeff

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