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Old 02-24-2009, 10:28 PM   #1
Spudchucker
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Default Chain-driven SC instead of a belt?

Has anyone here made a chain-driven supercharger instead of a pulley-driven one? Last night I got to thinking maybe I could get a rugged bicycle sprocket set, and have two speeds for the Eaton by installing a servo-powered derailer to change which gear the chain is running on. This would be awesome for me because I love flooring it, but I almost never go over 3,500.. Why not have it set up so I can have more boost at the low RPMs without blowing up my motor at high RPMs, while still being able to change it on the fly so I can run it up when I want to?

That, and it's one more cool switch on my steering wheel
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Old 02-24-2009, 11:36 PM   #2
joker75
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I like the fact that you are trying to be unique, and try new and different things on your car, but I'm starting to wonder when you will realize that more is not always better. Any time that you add another part or combination of parts you are also adding more things that can break and cause you a lot of grief.

I know that there is a two speed transmission for a Rotrex centrifigal supercharger. I haven't seen one for the eaton supercharger that you are planning on using, but that doesn't mean that one doesn't exist.

Good luck on your quest to re-invent the wheel, just make sure it stays somewhat round, I would hate to see you trying to make a square wheel just to be different.
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Old 02-25-2009, 06:41 AM   #3
Spudchucker
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Thanks, I like the way you put that lol- my wheel may end up somewhat oval in the end, my mind doesn't slow down for turns anymore than my car does

I actually got started thinking about chains because it seems like it would be easier to me for a simple setup, (you don't have to make sure it's very tight or line it up completely flawlessly,) then I realized that chains are perfect for gear switching too. So I guess the question of first importance to me is really this: Why doesn't anyone use chains? I love the idea of using a solid bike chain, and the only thing stopping me is if it doesn't work. In my mind sticking a sprocket on the end of a pulley and attaching a bike chain is easier than getting a new belt and lining up pulleys. Thanks again
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Old 02-25-2009, 08:40 AM   #4
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Chains are probably not used because they ware , are noisy and require lubrication.
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Old 02-25-2009, 09:30 AM   #5
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When you say bike chain, do you mean "Pedal-Bike" or "Motor-Bike"? I assume pedal-bike since you also refer to a derailer.

The 3 things that pop into my head as being an issue are
1. Weight: A chain is a fair bit heavier than a belt. It's going to cause some pretty good orbiting.
2. Speed: How fast can you safely spin a bike chian? My M62 is going to be spinning at 10Krpm at the supercharger pulley when it's at 6500 at the crank.
3. Strength: Can a chain take the HP loads? My calculations show that I'll need 10HP to drivemy M62 to redline. Plus, belts actually stretch just a little to take the shock loads away from the mechanical components a bit. Chains don't.

I'd really hate to see you go with a chain setup, only to have it bust and then go flying around your engine compartment at 5000 RPM connected to yourcrank shaft, ripping out parts as it flings around. I like your thinking outside the box, but you really should stick to "Tried and True" technology if your going with a home DIY.
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Old 02-25-2009, 10:39 AM   #6
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Quote:
Originally Posted by Skidd View Post
When you say bike chain, do you mean "Pedal-Bike" or "Motor-Bike"? I assume pedal-bike since you also refer to a derailer.

The 3 things that pop into my head as being an issue are
1. Weight: A chain is a fair bit heavier than a belt. It's going to cause some pretty good orbiting.
2. Speed: How fast can you safely spin a bike chian? My M62 is going to be spinning at 10Krpm at the supercharger pulley when it's at 6500 at the crank.
3. Strength: Can a chain take the HP loads? My calculations show that I'll need 10HP to drivemy M62 to redline. Plus, belts actually stretch just a little to take the shock loads away from the mechanical components a bit. Chains don't.

I'd really hate to see you go with a chain setup, only to have it bust and then go flying around your engine compartment at 5000 RPM connected to yourcrank shaft, ripping out parts as it flings around. I like your thinking outside the box, but you really should stick to "Tried and True" technology if your going with a home DIY.
To add on to this, you'd better know if the derailleur bearings and gears can take the power and load you're asking it to run. I would imagine the bearings and the gears would not be able to handle the rpm and load. I would also worry about if the derailleur would change gears effectively at the rpm you'd be running at. There is a real big risk here that you could really **** a lot of things up so I also recommend you either do a lot of testing or don't do this at all.
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Old 02-25-2009, 11:37 AM   #7
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Hmmm! I missed the talk about the bicycle rerailer. Do not do this it will definatly self destruct. You are way out of the design criteria of the those parts.
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Old 02-25-2009, 01:52 PM   #8
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its a safety issue, the chain drive would need to be enclosed...but this sounds like a not-thought-out plan
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Old 02-25-2009, 02:55 PM   #9
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I'm not sure what it's called, but the utilization of a CVT comes to mind. As your RPM's increase, the effective pulley size of the SC increases too. Better than a chain, better than a transmission, just better.
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Old 02-25-2009, 04:59 PM   #10
Spudchucker
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Originally Posted by litebrite2001 View Post
I'm not sure what it's called, but the utilization of a CVT comes to mind. As your RPM's increase, the effective pulley size of the SC increases too. Better than a chain, better than a transmission, just better.
Centrifugal something Transmission maybe? I love the idea of being able to change the gearing on the fly, and although apparently the chain idea is dangerous, expect my mind to keep thinking this through with other mechanisms I'll do a little research into this CVT thing and see what comes up

MasterC- Yes I know this wasn't well thought out or anything, it's just an idea that I wanted to know the possibilities of before investing more time into. I read about chain-driven superchargers in a few places online, and wanted to see what everyone here thought of it (apparently not much haha). By bike chain I was thinking heavy-duty bike chain with a guard on it. I figure if sport bikes can put as much speed and load on a chain as they do, then a smaller version oughta survive a supercharger. Also, I know top fuel dragsters use chains, but theirs are probably something special and super expensive

Thanks for the input everyone, it's much appreciated. This probably won't be the last thread where I ask about some far-fetched idea either lol, but bear with me and hopefully this will be a (working) unique build in the end. Something about "normal" just doesn't work with me, my mind is in too many places at once
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Old 02-25-2009, 05:02 PM   #11
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The CVT idea has been broached already

http://forums.nasioc.com/forums/show....php?t=1703343
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Old 02-25-2009, 05:06 PM   #12
Spudchucker
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Quote:
Originally Posted by Skidd View Post
The CVT idea has been broached already

http://forums.nasioc.com/forums/show....php?t=1703343
Good info, thanks bro
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