03-16-2016, 09:52 AM | #1 |
Not Yet Wild
Join Date: Aug 2011
Location: NW Mississippi
Posts: 28
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Gearing
Not sure what the gearing is on an 1997 electric CC. Ok Guys I need some expert advice on gearing. The tires are 23x10x14. The sprocket on my F-R-N transmission is 10 tooth for a 420 chain. Any idea what tooth sprocket I should look for to weld on the shaft where the electric motor used to be. It's a 3/4" 10 spline shaft. Not looking for alot of speed or for climbing hills. Just riding around in the pits and letting my grand kids putt around the neighborhood.
I can change the sprocket on the transmission if need be. Man if this were a perfect world or I had a machine shop I could make a sprocket that would fit a 3/4" 10 spline shaft. I really appreciate all the help you guys have provided. While waiting on a belt & a couple more parts I have the throttle completed. Probably tackle the wiring today. |
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03-16-2016, 12:14 PM | #2 |
Not Yet Wild
Join Date: Aug 2011
Location: NW Mississippi
Posts: 28
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Re: Gearing
Update ! I found out the rear gear ratio is 12.5 to 1. So with that number I need to know what tooth sprocket to weld on the output shaft.
I thought I had found a 10 spline coupler for the 3/4" shaft, but it was for a 1 1/2" shaft. I would rather weld the sprocket on a coupling so that I could change the gear ratio at a later date. Then I could slide the coupling off and replace it with another sprocket. |
03-17-2016, 06:54 PM | #3 |
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,436
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Re: Gearing
What if you welded the coupler on the shaft, then bolted the gear to it? You could still change gears then. Never done it, but seems like a viable option? Might have to have a machine shop make a coupling for you? Might even have them make it to fit the gears. Lots of gears to choose from, just pick a style and go with it. Sometimes you don't know what gear to use until you try one.
Did you try searching the forum for "electric to gas conversion"? |
03-17-2016, 08:14 PM | #4 |
Not Yet Wild
Join Date: Aug 2011
Location: NW Mississippi
Posts: 28
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Re: Gearing
Yea but not much luck on gearing suggestions. Probably start with something like a 12 - 14 tooth sprocket. I ordered a straight shaft coupling with a key way. It's for a 3/4 " shaft so may can make that work.
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03-21-2016, 09:16 PM | #5 |
Vegas modded 420
Join Date: Jun 2009
Location: West MI
Posts: 15,443
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Re: Gearing
Stock cart is 13:1 trans, however in high gear the cvt overdrives .9 so top gear is about 11:1. But that is top gear, cvt will run about 3:1 in low gear to take off compared to .9:1 in top speed gear. So it depends on what speed you want, what clutch you are using, etc. With 22 tires and no governor that is about 30mph for a stock engine that runs maybe 4300 rpm floating the valves. Without a cvt or gears you will need something like 2:1 maybe, so to go 15mph top speed you would run twice the sprocket on the rear as the engine crank runs a sprocket. If you use a gokart clutch for example you cant gear too high it wont get going it will burn the clutch unless you are on a road.
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03-22-2016, 07:46 AM | #6 |
Not Yet Wild
Join Date: Aug 2011
Location: NW Mississippi
Posts: 28
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Re: Gearing
I'm running a CVT. Also I have a F_N_R transmission. Just trying to get an idea of which tooth sprocket I should run on the rear. I guess you could say it is sort of like running a jack shaft. The transmission has a 10 tooth sprocket on the output/jackshaft. From that I will weld a sprocket on to a motor coupling that fits on the input shaft to the rear end. Take a look at some of my pics from previous post and you will see what I'm talking about.
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03-22-2016, 03:36 PM | #7 |
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,436
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Re: Gearing
If you are running a chain between the crank and the cvt, then don't you want the same gear on each side so it's an even 1:1 transfer? That would be like a jackshaft setup.
I'm guessing you want more top end speed, so then on the crank use two or three teeth larger to start, build it so you can use a larger gear if more speed is desired. Or start with 14t on the front and 16t on the rear. Then you can swap them to get more speed, or keep a 12t on hand and throw that in the mix. |
03-22-2016, 04:54 PM | #8 | |
Not Yet Wild
Join Date: Aug 2011
Location: NW Mississippi
Posts: 28
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Re: Gearing
Quote:
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03-23-2016, 03:48 PM | #9 |
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,436
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Re: Gearing
Remember, larger gear on the trans will give a lower speed. To go faster, you'll want a smaller gear. Front gear you would go larger for more speed. On my quad, I would swap out the front gear for the most dramatic change in speed. Stock was 14t and I had a 12t for hill climbing and 11t for woods racing. I also had a 16t that I tried to set the "quad land speed record" (joking of course) , that didn't work out so good. Hopefully you are close speed/torque wise and adding a tooth here or there will get you where you want to be. It's hard to say with the cvt and differing gears.
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03-24-2016, 08:40 PM | #10 |
Vegas modded 420
Join Date: Jun 2009
Location: West MI
Posts: 15,443
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Re: Gearing
If you have a 12:1 rear and you run 1:1 to the cvt you should have a cart that is slightly slower than a normal cart. So you would see around 28mph at 4300rpm or so. This assumes your trans is 1:1 in forward gear. 4300 is about top rpm for a stock lawn engine with no governor and no mods. If you gear lower (larger sprocket on the rear than on engine/cvt powered jack shaft) you will go slower but have more power, or the opposite if you go the other way.
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