Thread: differential

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    differential
    #1
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    ok to start im a dinosaur when it comes to computer stuff so my typing sux. also a bit of a beginer at fabrication. im planing to build a mini rail or trike that will be dual purpose, with a lot of street time. planning tu use at least a 600cc engine. and i am a tight wad. so im wondering what would be the best starting point for a differential. i am a machinist with acsess to a good welder. would something from a used quad hold up to it? i wanna stay away from car parts cuz of weight concerns. thanx in advance
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    Re: differential
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    Millenium Member Deranged's Avatar
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    Welcome Hackncut! There are a couple threads talking about using a BMW differential. That could be a salvage yard part... But there are more vehicles out there that use that style rear end... I think some smaller Honda SUV's have something similar, even a 4wd Ford Escape has a small center section that could be used. the wider you go with a center section, the less travel you will get, unless you keep making your buggy wider, and wider... Hope this helps!

    Justin
    Nowhere near the desert.
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    Re: differential
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    wow i guesse im more of a dinosaur than i thought,cuz i think of parts on cars and just think of those big old cast iron parts from the old V8 days.i was thinking a quad part but then i dont know if it will handle the extra weight and power. the smaller car parts would work great. and the focus is old and common enough that the cost should be right. thanks deranged
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    Re: differential
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    Admin Gene's Avatar
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    Also if you select an SUV type differential as mentioned, lean toward one with larger wheel and tire diameter. This will allow you to select smaller diameter tires and wheels for your build while taking advantage of the gear ratio the manufacturer used to make the larger tires and wheels work well.

    In other words, late model vehicles with 20" wheels have relatively low gear ratios. Using a smaller wheel and tire combo for off road makes the gearing even lower, which is good.
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    Re: differential
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    thanks hadnt even thought bout that great idea
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    Re: differential
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    Member 1993KA24DET's Avatar
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    you can also use a Miata LSD. take it out of the pumpkin housing and take off the ring gear. then bolt up a 52 tooth sprocket and make bearing mounts to hold the LSD. that will work if you want to do CV half shafts or solid axle. this is a pics of just one i found
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    Re: differential
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    any additional info on that?

    I see where the pic came from. Curious if you have the background story with it.

    I can see that working in another application I have in my head.
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    Re: differential
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    Member 1993KA24DET's Avatar
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    there is quite a few forums that have done the Sproket/Miata Diff. What else do you want to know
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    Re: differential
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    Admin Gene's Avatar
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    Once nice thing about that setup is that it moves the sprocket off the CV flange. Some spools have the sprocket mated to the back side of the CV and a larger diameter mating surface is better IMO.
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    Re: differential
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    I made a drivetrain from an old LSD from an impreza
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