Making a custom bike engine

Discussion in 'Motorized Bicycle Welding, Fabrication and Paintin' started by Mitchg95, May 18, 2014.

  1. Mitchg95

    Mitchg95 New Member

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    Man does time fly when you are designing parts :)
    I spent about five bourse today drawing parts, and working out design problems
    I determined the firing order of the cylinder, designed all the parts for the crank shaft and figured how I'm going to put that together. I also drew out a design for the fly wheel and made a elevation drawing of the engine with my parts. I'm going to see if there is any way I can shorten this engine tomorrow as my current drawing is 17" long.
    I have a feeling I can shorten is up a couple inches with a couple extremely simple mods to the prints.
    I'll post pics of what I did in the morning.
    I'm getting paid tomorrow, so maybe I'll order some material for the engine and start production :D
    Mitch
     
  2. curtisfox

    curtisfox Well-Known Member

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    Have you seen the tube video lawn mower conversion single to twin?.........Curt
     
  3. Mitchg95

    Mitchg95 New Member

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    I think I may have a while back. I'll have to go do a search for it right now
     
  4. Mitchg95

    Mitchg95 New Member

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    Just found this, It is an old model aero engine that is a flat six, if I can find more information on this it will help a great deal in the design
    [​IMG]
     
  5. Mitchg95

    Mitchg95 New Member

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    Holy cow!
    These set of pictures are one heck of a great help to say the least. I found a build article on the engine which I will post a link at the bottom of this post.
    Here is the case and how it all goes together.
    [​IMG]
    [​IMG]
    This picture shows the shaft and the reed valves
    [​IMG]
    Here is the link
    http://www.modelenginenews.org/elf/erics_elfs/index.html
     
  6. Mitchg95

    Mitchg95 New Member

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    Took a little break from designing parts, but got back to it yesterday and designed the front bearing housing
    [​IMG]
    Ad determined what frame I'm going to buid. I'll probably Change a few things about the frame, but here is a general picture that I'm going for.
    [​IMG]
    More to come tomorrow. Currently I'm designing the rear bearing housing and flywheel
    Mitch
     
  7. Theon

    Theon New Member

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    Good find.
     
  8. Mitchg95

    Mitchg95 New Member

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    Scored an old Schwinn road bike that I'm going to use for the engine. I've already determined that the fork tube and rear tubes are parallel to each other and the bottom tube is 63 degrees relative to the rear tube.
    Here is the bike with me next to it. The frame is friggin huge.
    [​IMG]
    I saw a spider lol
    Mitch
     
  9. Theon

    Theon New Member

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    I have an Old Raliegh of similar size, It's a Good handling bike at speed.
    But I couldn't find away to give it adequate brakes on my budget.
    I put mine on some good 26" rims with a 1.95 tyre, but there wasn't room in the forks to get a disc in there and a good set of forks weren't in the old girls warrant.
    It needs a second top tube welded in and an inframe tank, would love to do it up as a board tracker one day.
     
    #69 Theon, Jun 12, 2014
    Last edited: Jun 12, 2014
  10. TakeiT

    TakeiT New Member

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    Are you going to convert it into a 4 stroke? Or leave it a 2 stroke?
    Check out 805Roadking on youtube, he took 4 briggs engines and made one sexy 4 cylinder. Maybe you can get ideas from them.
     
  11. Mitchg95

    Mitchg95 New Member

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    It's going to stay a two stroke. I'm currently designing a frame for the engine, because I've gotten to a point where I need a frame to go off of before I can design of the components and I've deemed the Schwinn inadequate
    Pics to come tomorrow if I remember. I've got church in the morning and a job interview directly after that
    Mitch
     
  12. Mitchg95

    Mitchg95 New Member

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    We'll I got the job, I am now a salesmen for vector. They are the daughter company of cutch knives
    Anyway, here is what I've been up to in the design process of the bike.
    I've started designing a frame for the engine. Here is what I have of that so far. IT is in 1/8 scale
    [​IMG]
     
  13. Citi-sporter

    Citi-sporter Member

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    Seems like a frame like this would be more conducive to a V4 type of engine. You'd also have more individual firing impulses which would be smoother running.
     
  14. Dan

    Dan Staff
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    Congrats on the job, Mitch!

    Your designs are looking great and am looking forward to seeing your finish work.


    Reading your thread made me think of a song;


    I gotta job waiting for my graduation
    Fifty thou a year will buy a lotta beer
    Things are going great, and they're only getting better
    I'm doing all right, getting good grades
    The future's so bright I gotta wear shades.....
     
    #74 Dan, Jun 17, 2014
    Last edited: Jun 17, 2014
  15. Mitchg95

    Mitchg95 New Member

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    Sorry I have not posted in a while. Ive been busy with other stuff so I have not gotten alot of designing done since my last post.
    I have worked out alot of the design issues I have been having since first considering this project and have worked them out. The crank shaft will be mostly solid but made from 3-4 parts. And the crabkcase will be machined from two halves. I have a design drawn up for the left crankcase halve, all that is needed to do now for that is to design the mounting system and how the reed valves will work and to also draw it up on master cam and start programming the haas cnc mill to make the actual parts.
    Ill post a picture of theeft hand case drawing later when I get home.
    Hope everyone is doing fine
    Mitchg95
     
  16. Mitchg95

    Mitchg95 New Member

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    We'll half a year has gone by since my last post, I have been working hard on the design over the last few days and solved a few design problems that I have been having since first starting the design process. The case will be made out of two halves that will be sand cast rather than fully machined from two solid blocks of billet. The crankshaft will be one solid piece as to alleviate the complexity of a crankshaft made out of multiple parts, connecting rods will be made like standard rods found in car engines.
    I have contacted a company located out of Wisconsin, that does prototyping for engines, they will aid in my design and be able to cast and machine the castings for the prototype engine, I should be able to post a couple pictures of my current drawings tomorrow after sorting out some family issues. One major problem I have had in the design is trying to figure out how far off of the center line of the crankcase the cylinder should sit, but I think I have nailed that problem down.
    Mitch usflg
     
  17. Flyman

    Flyman New Member

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    Mitch I,m a retired tool & die maker & have been a auto machinist before
    that. Also many years of my life was involved in Drag & Kart racing. If
    there is any thing I can help you with just PM me. I,m retired now & have
    kept some of my Machine shop equipment & built my shop next to the house.

    I still have many irons in the fire even in retirement. You are taking on a huge project.
    I love to see a younger man taking on something as you are. But do the home work.

    It takes much more than machining to build a engine. I built some RC engines in the
    past. Some better than others, & be leave me there a big learning curve. But
    I would be glade to share what I have learned over this many years messing
    with such.

    Good luck my friend Fly
     
  18. Mitchg95

    Mitchg95 New Member

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    Any and all help is very greatly appreciated, I know a bit about internal combustion engines from rebuilding them, I'll definitely pm you with some questions Fly :)
    Hopefully I can start producing this soon usflg
    Mitch
     
  19. Flyman

    Flyman New Member

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    Mitch I,m sure you do know much about engines to even take on such
    a project. I don't want to come across as a know it all by any means.

    I have never quit learning, from others for that is how we acquire knowledge.
    When I worked as a auto machinist I worked for one of the best engine builders
    in the Midwest. Louis Boyd was his name, & he campaigned one of the fastest
    Top fuel dragster of that day. He was truly my mentor .

    The things I learned from him carried on even into my tool & die work. I was very
    lucky to work & learn from that man. Even though it been year back many thing don't
    change. Line boring, rod rebuilding crank grinding, balancing & so on.

    I do not know what type of lower end bearing you plan on? If you are going to run
    needle bearings, then what alloy rod & do you have a heat treat oven? Things as that.

    Just stuff to consider
    Fly
     
    #79 Flyman, Feb 14, 2015
    Last edited: Feb 14, 2015
  20. Mitchg95

    Mitchg95 New Member

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    By all means' I do not know everything, I'm not even close to that and I'm sorry if I seem to be coming off as a know it all or a smart a*s as that is certainly not what I want todo. Since last night I have done more research online, and on forums and have found plans for a 120cc flat 4 that is remarkably similar to what I was designing. I am very strongly considering purchasing that set of plans and adding an extra 2 cylinders, and possibly scaling up the plans a slit bit, here is a link to what I have found
    http://www.cad-jung-shop.de/epages/62479729.sf/en_GB/?ObjectPath=/Shops/62479729/Products/00-Z0004-0
    I'm sorry if I came across the wrong way
    Mitch usflg
     

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