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  #51  
Old 11-04-2016, 12:02 PM
Neto Neto is offline
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If you attempt to load the pictures in a new tab, a message from PhotoBucket appears saying that they are down for maintenance. Other threads seem to be the same.
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  #52  
Old 06-03-2017, 06:21 AM
Neto Neto is offline
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Todd, another question, if you don't mind. (I can't get this whole deal out of my mind....)

I've been reading on the cycleKart site a good bit, and I'm trying to understand the gearing ratios used with the CVTs. From what I see there, they get roughly 3:1 at the low end, up to a bit over 1:1 at the high end.

Then, they also talk about the gear reduction at the sprockets (chain), most running around 6:1 up to around 4.5:1. Does this sound right?

OK, now my question is, what is the final ratio at the axle? Assuming they use 6:1 reduction at the chain, and the CVT gives them 3:1 through 1:1, is the final ratio at the axle 18:1 at the low end, and up to 6:1 at the top end?
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  #53  
Old 06-03-2017, 07:11 PM
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Todd Todd is offline
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Hmmm, I just bought the recommended axle sprocket and used the gear that was on the CVT. It feels wicked fast to me.
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  #54  
Old 06-03-2017, 07:23 PM
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smallfoot smallfoot is offline
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Your final drive ratio would come from the ratio of the last two pulleys going to the shaft driving the wheels. 10 tooth on one and 60 on the other will give you about 6/1. The cool thing about the torque converters is that expanding belt pulley that changes diameter as the motor speeds up changing the whole deal from there on out. It allows you some breaking control with engine speed. We're having a ball with my kart and the grownups are in just as much as the kids. According to calculators, mine will do 31 mph. I firmly believe that....it's hauling buggy tho for kids going thru the woods out here...
All I can say is try one. Simple to build. Respectable fun for peanuts too. Go to the kart sites and follow directions if ya get stumped...nothing to it!

Lots of info here: http://www.bmikarts.com/Racing-Karts...rts_c_778.html
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  #55  
Old 06-04-2017, 03:50 PM
Neto Neto is offline
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Quote:
Originally Posted by smallfoot View Post
Your final drive ratio would come from the ratio of the last two pulleys going to the shaft driving the wheels. 10 tooth on one and 60 on the other will give you about 6/1. The cool thing about the torque converters is that expanding belt pulley that changes diameter as the motor speeds up changing the whole deal from there on out. It allows you some breaking control with engine speed. We're having a ball with my kart and the grownups are in just as much as the kids. According to calculators, mine will do 31 mph. I firmly believe that....it's hauling buggy tho for kids going thru the woods out here...
All I can say is try one. Simple to build. Respectable fun for peanuts too. Go to the kart sites and follow directions if ya get stumped...nothing to it!

Lots of info here: http://www.bmikarts.com/Racing-Karts...rts_c_778.html
OK. I think I understand now. You sort of ignore the variable ration at the CVT, or you might say assume it is running full out (at 1:1) to arrive at the final ratio of 6:1 with the gears you mention. Is this correct? So then the low end ratio (at just above idle, or where you begin to get forward motion) is around 18:1. Or am I still messed up? (Here's how I'm figuring this. I've read that the CVT's low range is around 3:1. So 3 X 6 = 18.)
The reason I'm trying to get a handle on this, is because I'm thinking of using a differential with a variable speed mechanism out of a Snapper riding mower as a jack shaft. From my figures, the stock ratio is about 37.8:1 in high gear. But I can easily drop that to 3.3:1 by leaving out part of the mechanism. That's about where the normal cycle cart's CVT is in the low range, so then my final gears (each wheel separate, from the jack shaft to the wheels) would need to be sort of reversed, like maybe 1:1.8, to get a final ratio of 6:1. (You can probably tell I'm still having trouble wrapping my head around this. Please don't laugh just yet.)
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  #56  
Old 06-05-2017, 11:48 AM
Neto Neto is offline
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Quote:
Originally Posted by Neto View Post
...
The reason I'm trying to get a handle on this, is because I'm thinking of using a differential with a variable speed mechanism out of a Snapper riding mower as a jack shaft. From my figures, the stock ratio is about 37.8:1 in high gear. But I can easily drop that to 3.3:1 by leaving out part of the mechanism. That's about where the normal cycle cart's CVT is in the low range, so then my final gears (each wheel separate, from the jack shaft to the wheels) would need to be sort of reversed, like maybe 1:1.8, to get a final ratio of 6:1. (You can probably tell I'm still having trouble wrapping my head around this. Please don't laugh just yet.)
I realize now that I reversed the way ratios should be represented in that last one. (I had 1:1.8, but the final figure should always be 1, for the rotation at axle. Correct?) I need to get some pictures of how this Snapper diff. is set up, and did take a few, but need more to hopefully have it make sense. But work is getting in the way of this.
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  #57  
Old 10-12-2017, 11:42 AM
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Hey Todd, I don't know if you are still watching this thread of yours, but if so, I was wondering if you ever weighed the sheet metal from the Allis Chalmers you used. I recently got a scale, and weighed the cowl & hood from the FarmAll M I have, and just those two pieces come to around 43 lbs. I knew it was heavy stuff, but didn't expect that much.
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  #58  
Old 10-12-2017, 07:30 PM
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I never did weigh it. Just went for the cool factor.
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