Custom manual clutch

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smgs92

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I'm interested for my minibike would this hold up to 12-15hp it's a modded predator 212cc.
I'm also curious if you are going to build one for a 1in shaft? If you are when do you think you could get them available for testing? I have a DSLR that does 1080p and slow motion I could film the clutch in action.
 

jujupope

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I'm in for one as fast as you can ship. What is the website or contact info. What is this clutch called? I will stick it on my Warrior custom build bike.
 

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ddowns46

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Fabroman:

Yes this clutch can be used on a vertical shaft engine, as long as it's 3/4" and you have the standard utility 4 bolt pattern.

We currently have designs for a 1" unit, but we won't be able to start production for these parts until we gain enough steam with the 3/4" units. That being said, we will be open to special order for the 1" clutch but it will be a bit more expensive at first.

As far as testing goes, we've only been able to use the clutch on a few different vehicles so far. We plan to sell the first set of units discounted to the guys on the forum so that you guys can put these bad boys through hell and back and provide us with some nice feedback. If you look at the photos of our first prototype, you'll notice that this clutch is purposely robust for various types of applications. I can only imagine an equivalent centrifugal clutch will start slipping long before ours does...

Also, we're going to be taking the kart out this weekend so hopefully we can put up some rough videos just to give you guys a sense for how the clutch performs. You won't be let down!
 

Doc Sprocket

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I am VERY interested! As one who has absolutely punished other clutches, I look forward to handing out a beating to yours!

As a related aside, I am weighing the concept of trying to run this one past the technical inspectors of the race mower league I am getting involved in. This could be a whole new niche market for you, and a new dimension for mower racing. Maybe we oughta talk! (FYI- I would need a 1" version for this, but for laying a beat-down with a kart, 3/4" is in order)
 

ddowns46

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That would be awesome toystory! The lawn mower racing industry is definitely one that we are looking to market towards, and I'd be interested to see what your tech inspector says about using a custom unit such as this. And like I said, we plan to sell a 1" unit for a #41 chain and it will have beefier springs and hardware to handle more torque.
 
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Doc Sprocket

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I think this does warrant further investigation. I just took a buzz through the rules book again. One one hand, it does not specifically say "no automotive or plate-style clutches". On the other hand, all aspects of a machine are up to the discretion of the Tech director or committee. This is definitely something that would require some conversation. Simply trying to explain it probably wouldn't get me anywhere. I think I'd have to either physically showcase the unit, or present a packacge consisting or drawings, photographs, specs, etc.
 

fowler

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The only benift it will give u is either longevity and or the option to spin the tyres

The only thing I think they could argue is u can gear higher due to the fact u can feather the clutch to get moving

But ain't most of u running a tensioner clutch

If u start selling 1 inch versions ill certainly be intrested
 

Kaptain Krunch

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will the friction material be replaceable? I'd assume once u wear it down to metal you could simple re-jb weld on another piece?
 

ddowns46

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The clutch material will definitely be replaceable. We will offer all of the replacement parts including different sprocket sizes, stiffer engagement springs etc.
 

ddowns46

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There will definitely be the option for different sprockets and chain pitches. The clutch was designed to have this part interchangeable. Currently our minimum size sprocket for the 3/4" is a #35 14 tooth.

In response to price, we won't have this dialed in until our first round of production parts are fully assembled. Our target is $100-150 and as of now there is now reason why we shouldn't easily meet this.
 

r_chez_08

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Sounds like your onto something here! Nice product. Sounds like a great unit. If I didn't already have a torque converter in my bike, I might be tempted!
 

Doc Sprocket

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The only benift it will give u is either longevity and or the option to spin the tyres

The only thing I think they could argue is u can gear higher due to the fact u can feather the clutch to get moving

But ain't most of u running a tensioner clutch

If u start selling 1 inch versions ill certainly be intrested

Yes- the norm is either a belt tensioner system, or in some classes a centrifugal clutch. I can see this manual clutch tolerating the heat and abuse better than a C-clutch, and with no parasitic drag from a belt. In addition, not using a belt means getting rid of the sideloading on the PTO and tranny input shaft. This potentially extends bearing life. This will also take the guesswork out of selecting an appropriate belt size, which can be hit-or-miss with a tensioner setup.

This could also sut down on belt slip, which could easily be seen as a clear advantage against other racers.

Gearing higher, however, may bot be all it's cracked up to be. I'm still up to my schnozz in research, but it would seem that gearing is a delicate balance. I'm sure kart racers on this forum would agree. Yes, you want the high speed, but need to be able to rapidly accelerate out of the turns, and we're talking fairly short tracks, here. Gear too high, and you're now slipping the bejeezus out of that clutch to avoid bogging- thus losing any advantage you had.

The BIG issue, as I see it- is convincing the race gods to let me try it. This is "new". If they don't understand it, they won't allow it. If they think it's "voodoo", it's out.

Hence, more info is better. Presenting the unit in person is one thing. Having a spec sheet, and technical drawing may help explain it. But in my limited experience to date, they seem to blindly stick to policy, and don't seem particularly interested in illustrating the scenario(s) that led to the policies.

That said, I'm still waaaay interested! Sponsorship? :drool5::stir::D
 

ddowns46

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Check out the links below to see the clutch in action. We've come to the realization that we definitely need more horsepower to really put the prototype through its paces, and we'll make that our next project. That being said, the clutch handles this stock predator with ease. In the video you'll see that we're using a lever to actuate the clutch, but the production clutch will be operated via cable.

http://www.youtube.com/watch?v=9DXW6k73b5Y

http://www.youtube.com/watch?v=_E14X_aGrYk

Also, we did some primitive torque testing to determine the maximum torque capacity before slippage of the clutch. We used a breaker bar on the crank and locked up the sprocket using an extra piece of chain clamped to our weld table. We then hung weights off the end of the breaker bar and determined the max capacity to be 42 ft-lbs. In the future, we will offer springs with different load ratings so that users can select a spring setting based on their specific setup.
 

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B man

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So it engaged at first and then dis-engage when you actuate the lever like a real clutch? or is it engaged by actuating the lever?
 

ddowns46

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Yes, the clutch is engaged when the lever is released, just like on a car or motorcycle. If we hooked a lever onto the steering wheel, the clutch would be disengaged when the lever is pulled in.

We could actually hook a cable operated lever up to this clutch, but a lever was easier to set up at the time and good enough to prove concept.
 
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