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  1. #1
    CB750 Enthusiast Sprocket's Avatar
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    twin engine blower bike

    This is just in the brainfart stage right now, but I've been thinking about it for a long time.
    Twin motor big bore, stroker, displacement should be around 1064 each.
    Both motor will be without trans portion of case, crankshaft power coupled via HD style primary chain or belt (modern belts can handle a lot with less lash) Rear cylinder head will be reversed to keep intakes together and exhaust heat away from front motor carbs.
    Motor/trans mounting will be via motor plates on both sides like a top fuel bike.
    Trans will most likely be Lenco, it IS a dragbike!!!
    No doubt it will be in a custom frame, digger/old school '70s dragbike. But the chassis will be built around the motor configuration, no adapting something else to "work with".

    Like I said, I'm just in the brainfart stage of planning, researching cams for the reversed cylinder head (gonna write to Dynoman and Jay @ATI about that), clutch choices and of course trans ratios... and a bunch of other shit that I can't remember or havent though of yet...lol

    Posts on this will be spotty at best until I start gathering the main ingredients of 2 motors so mockup can begin. It'll prolly take a year or so just to get the motors mocked up and into a chassis while keeping up on makin' a living, cool thing is my OL is all for it and behind me 100%. Love that woman!!!
    In the end, I'm gonna want to do some LSR racing with it and ultimately a trip to Bonneville.
    Not planning a full tilt race only bike either, I wanna rid this bitch on the street!!!!

    Any ideas or thoughts on this are welcome.

    I have 2 cases that are going to get cut tonight, and the blower (Eaton M90) is awaiting a little bit of TLC before polishing.
    I need 2 cylinder blocks and one more head so I can get to mocking up the engine plates, blower manifold and injector bosses/fuel rails.
    Once the major mockup of these is finished, I'll start building the chassis. BIG tire, 70s style digger dragbike.
    The motor build(s) will take the longest and require the most dollars, so that's the last major thing I'll do.


    This should be fun, entertaining, aggravating and an all around good time.
    Hope you're entertained
    Dan "Sprocket" Harris
    Sprocketwerx Motorsports
    Custom chopper parts, drag race support, machining and fabrication.
    My rides/projects: 2-CB750, 1-CB650, 1-CB450twin, 2-XS400, a bunch of XS650, 2 XS1100

  2. #2
    CB750 Enthusiast Sprocket's Avatar
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    Pics are at http://s1165.photobucket.com/albums/...750%20Project/
    and will be updated there any time something new gets done
    Dan "Sprocket" Harris
    Sprocketwerx Motorsports
    Custom chopper parts, drag race support, machining and fabrication.
    My rides/projects: 2-CB750, 1-CB650, 1-CB450twin, 2-XS400, a bunch of XS650, 2 XS1100

  3. #3
    Forum Staff Travis's Avatar
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    This is going to be awesome!

    As things move along, it would be cool if you could post some of those pictures here with a little description under them.
    - Travis

  4. #4
    CB750 Addict cafeken's Avatar
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    That's going to be sick dude

  5. #5
    CB750 Enthusiast Sprocket's Avatar
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    Things are moving along. Cases are cut and sitting on the bench with the blower in approximate position.
    Cylinder blocks and another head are on the way.
    Motor plate mockup as well as blower mounting and intake manifold will be next on the agenda.

    Click image for larger version. 

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    cases cut, transmission buh bye!
    Click image for larger version. 

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    Blower inposition
    Click image for larger version. 

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    another view of blower in position
    Dan "Sprocket" Harris
    Sprocketwerx Motorsports
    Custom chopper parts, drag race support, machining and fabrication.
    My rides/projects: 2-CB750, 1-CB650, 1-CB450twin, 2-XS400, a bunch of XS650, 2 XS1100

  6. #6
    Forum Staff Travis's Avatar
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    How did you cut those transmissions off? Bandsaw then mill?
    - Travis

  7. #7
    CB750 Enthusiast Sprocket's Avatar
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    I thought I posted this 2 days ago..lol
    I cut them with bandsaw, need to bolt cases together to finish machine the final surface for the blockoff plate.
    I also need to weld in some threaded bungs to bolt said plate to as there's no existing holes to use.
    Dan "Sprocket" Harris
    Sprocketwerx Motorsports
    Custom chopper parts, drag race support, machining and fabrication.
    My rides/projects: 2-CB750, 1-CB650, 1-CB450twin, 2-XS400, a bunch of XS650, 2 XS1100

  8. #8
    CB750 Enthusiast Sprocket's Avatar
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    Juggs and head should be here tomorrow!
    Gotta run to Portland MI to pick up the yammys I sold @ BBB (gotta deal with customs before I can title them) and make it back before the post delivery.
    Going to Ubly to race the chop, so nothing this weekend.
    I'll get a few pics tomorrow with the juggs and heads on for those picture junkies around here
    Dan "Sprocket" Harris
    Sprocketwerx Motorsports
    Custom chopper parts, drag race support, machining and fabrication.
    My rides/projects: 2-CB750, 1-CB650, 1-CB450twin, 2-XS400, a bunch of XS650, 2 XS1100

  9. #9
    CB750 Enthusiast Sprocket's Avatar
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    Got the jugs and head today and set it up for eye candy.
    Enjoy.
    Attached Thumbnails Attached Thumbnails IMG_20120824_134358.jpg   IMG_20120824_134333.jpg   IMG_20120824_134222.jpg  
    Dan "Sprocket" Harris
    Sprocketwerx Motorsports
    Custom chopper parts, drag race support, machining and fabrication.
    My rides/projects: 2-CB750, 1-CB650, 1-CB450twin, 2-XS400, a bunch of XS650, 2 XS1100

  10. #10
    CB750 Addict cafeken's Avatar
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    dude that going to be badass

  11. #11
    Forum Staff Travis's Avatar
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    So I thought the cased would be oriented the same way and the head would be flipped on the one?
    - Travis

  12. #12
    CB750 Enthusiast Sprocket's Avatar
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    Now that it's coming together (the major mockup parts) it's time to study and learn and design.
    This has a lot of issues that need to be addressed and a lot of work to make it happen.
    The rear motor WILL run the correct direction and the head will be reversed.
    For now, it's easier to visualize the overall with it flipped around. More to do with how it sits flat on the sump cover surface than anything else, it gave the V angle for me to see and fit everything into place, or at least verify that there is room for what I want where I want it.

    I need to machine a pair of dowels to crank journal diameter, and set up the motors off the table on V-blocks for the first round of MDF mockup motorplates. That will get the motors off the table and allow me to rotate the motors (on the "crank") to the correct position, and locate motor mount holes in the plate.

    I'm looking for some engineering drawings of the motor so I can work out the changes and save some measuring time on old parts. Lots of machining and fabrication before the motor builds are even close to starting. And more questions come up every step of the project to be answered or worked through.
    Dan "Sprocket" Harris
    Sprocketwerx Motorsports
    Custom chopper parts, drag race support, machining and fabrication.
    My rides/projects: 2-CB750, 1-CB650, 1-CB450twin, 2-XS400, a bunch of XS650, 2 XS1100

  13. #13
    Forum Staff Travis's Avatar
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    Sounds like fun! I can't wait!
    - Travis

  14. #14
    CB750 Enthusiast Sprocket's Avatar
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    This is the inspiration for this build. The bike pictured is being restored and will be raced against RC's other bike, the triple engine nitro injected Atchison, Topeka & Santa Fe bike, which is also under reconstruction/restoration.
    The triple crashed @ 170mph, Russ Collins designed the Sorcerer while recovering from that crash that almost killed him.

    Click image for larger version. 

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    Dan "Sprocket" Harris
    Sprocketwerx Motorsports
    Custom chopper parts, drag race support, machining and fabrication.
    My rides/projects: 2-CB750, 1-CB650, 1-CB450twin, 2-XS400, a bunch of XS650, 2 XS1100

  15. #15
    CB750 Addict cafeken's Avatar
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    nice hay is the a Eaton m90 blower that your using

  16. #16
    CB750 Enthusiast Sprocket's Avatar
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    Quote Originally Posted by cafeken View Post
    nice hay is the a Eaton m90 blower that your using
    Yes, it was a prototype piece used for mockup on mid 90s Thunderbird.
    Dan "Sprocket" Harris
    Sprocketwerx Motorsports
    Custom chopper parts, drag race support, machining and fabrication.
    My rides/projects: 2-CB750, 1-CB650, 1-CB450twin, 2-XS400, a bunch of XS650, 2 XS1100

  17. #17
    CB750 Addict cafeken's Avatar
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    great idea cause that blower is all self contained and can take a beating

  18. #18
    CB750 Enthusiast Sprocket's Avatar
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    I've worked much of my fabrication career in automotive prototype.
    We had access to some cool stuff back in the 90s.
    Lots of good parts slated for scrap. This blower has never ran. It sat on a shelf in my friend's shed for 10+ years...lol
    I finally talked him out of it for a song.

    There will be a mounting bracket for the blower which will connect the end plates between the motors for a solid blower mount.
    Oil pump should fit beneath that.

    I'll cut, weld, and machine the throttle body flange to point in the opposite direction (forward on the bike) and I need to decide what throttle body I want to use. Maybe a GM 2bbl from an LT1 or other MPFI setup.
    Dan "Sprocket" Harris
    Sprocketwerx Motorsports
    Custom chopper parts, drag race support, machining and fabrication.
    My rides/projects: 2-CB750, 1-CB650, 1-CB450twin, 2-XS400, a bunch of XS650, 2 XS1100

  19. #19
    CB750 Addict cafeken's Avatar
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    so you going efi thats going to be sweet why not a ford TB off a mustang

  20. #20
    CB750 Enthusiast Sprocket's Avatar
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    I like how the 2bbl GM looks
    Kinda like 1/2 of a Bugcatcher injector, it will face forward for ram air.
    Dan "Sprocket" Harris
    Sprocketwerx Motorsports
    Custom chopper parts, drag race support, machining and fabrication.
    My rides/projects: 2-CB750, 1-CB650, 1-CB450twin, 2-XS400, a bunch of XS650, 2 XS1100

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