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  1. #1

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    Belt wrap question (a.k.a. Holy shit he's finally working on it!!!)

    So, I'm mocking up the supercharger, and fabricating brackets. Position is dictated by clearance from the header, and from the hood (also belt alignment). Mocking up the belt has sorta given me pause... I'll be adding an idler to get enough of the belt wrapped around the blower pulley, but after the belt goes around that and down, I'm not sure it's making enough contact with the water pump pulley. See pictures:





    Thoughts? Bear in mind that this is not even remotely tensioned. Also, I'll be eliminating the power steering.


    Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut. -Ernest Hemingway

  2. #2
    Approved Vendor ZombieSatty's Avatar
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    Oops, I just posted something on the WGO thread about that.

    I'm trying to think of the clearance above and ahead of the pump. I would think you could get another idler tucked in there to get better purchase on the pump. I'm not sure how much it really needs in order to pump water around though. You're not that far off from stock AC-pump angles, which was prob your plan.
    It's not my fault, blame the radiation.

  3. #3

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    Yeah, that was basically the plan. I've got two options in mind... One is ditching the one idler in favor of two smaller ones, which would have the added benefit of additional wrap around the blower pulley. The other is moving the ribbed idler close to where the P/S pump used to be, putting the smooth idler in its place, and adding one idler between the blower and water pump.

    Ill be doing more mocking up this week... I just wanted to solicit outside ideas as well.


    Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut. -Ernest Hemingway

  4. #4
    6S Resident Hasselhoff. alexofnazareth's Avatar
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    If you needed a real small idler pulley, a dirtbike chain roller might work:
    http://www.mooseracing.com/products/?productId=410593

    the only concern I'd have is that those rollers have a bracket on each end of the bolt to support it on a bike.
    You'd have to weld up something similar to bolt it in.
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  5. #5

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    I'm thinking something like this :



    I spent a while looking for small pulleys, then I remembered I have a lathe, and some 2"-diameter chrome plated bar stock. So I ordered bearings, and will fabricate the idlers myself.

    2 idlers for less than $15? Yes please.
    Last edited by ExHempKnight; 05-30-2018 at 09:16 AM.


    Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut. -Ernest Hemingway

  6. #6
    6S Moderator S.Bretz's Avatar
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    I would try it with just the lower pulley but leave a provision for the second upper pulley if the belt slips. I would thing there would be plenty of contact on the charger pulley by using just the lower idler.
    -6S Resident Mechanical Forensics member #001.
    1995 SC2 Turbo 3.6L DOHC, 6sp manual, Ford 8.8 rearend running on MS3x.
    1998 F-250 5.4L triton...stock.

  7. #7

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    The upper idler is necessary to keep the belt from fouling against those ribs on the timing cover.


    Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut. -Ernest Hemingway

  8. #8
    6S Moderator S.Bretz's Avatar
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    Gotcha... Two pulleys it is then.
    -6S Resident Mechanical Forensics member #001.
    1995 SC2 Turbo 3.6L DOHC, 6sp manual, Ford 8.8 rearend running on MS3x.
    1998 F-250 5.4L triton...stock.

  9. #9
    chrispel's Avatar
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    I used a miata timing belt pulley. It's about 2"

    https://www.partsgeek.com/zf9mwq3-ma...ing+Belt+Idler

    attached picture
    Attached Images Attached Images

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  11. #10

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    Thought about something like that. Decided to just make my own. Rather than spend $36 for 2 store-bought pulleys, I spent $13 on 2 bearings, and used about $0.50 worth of scrap steel I had laying around. Spent a few hours at the lathe, making this:



    Still have one more to make.


    Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut. -Ernest Hemingway

  12. #11
    Approved Vendor ZombieSatty's Avatar
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    Sweet

    Don't forget to add lightness
    It's not my fault, blame the radiation.

  13. #12
    6S Moderator S.Bretz's Avatar
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    Lathes are so much fun to work on.
    -6S Resident Mechanical Forensics member #001.
    1995 SC2 Turbo 3.6L DOHC, 6sp manual, Ford 8.8 rearend running on MS3x.
    1998 F-250 5.4L triton...stock.

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