dingo 22" tires tav ratio

[Gator]

Just bought my 10yo daughter a go cart, think its a dingo frame, But it has 22" tires.
It came with a lct 6.5 clone engine, had a cent clutch 10 tooth, 60 tooth rear. it will hardly budge its own weight, dont know how anyone rode it with a cent clutch. Picked it up for $120.

I just ordered an ebay tav 30 series, it will have 6:1 ratio 10driven 60axle.
With the 22" tires do you think it will be ok for yard use on 2 acres or will it burn belts, with a 100lb rider?

I dont want to change tires, or rear sprocket if possible, the brakes are scrub set up for the 22" tires and i like the idea of small rear sprocket for ground/rock clearence.

Is there an 8 tooth sprocket avalibe for the driven? In 40/41 pitch? That would give 7.5:1


What is the tav underdrive rated at with 6:1 and 22" tires? I know the overdrive would be 5.4:1.

 

[landuse]

22" tyres are mighty big. I would say you would be on the borderline with a 6:1 gear ratio, but it is one of those times where you are going to have to try it and see if it works for you. If not, then you are going to have to rethink things. I am not too sure if you get an 8T, but I think you do get a 9T. You are going to have to wait for someone else to chip in on that.

 

[itsid]

Well according to my own (yet to be finished) calculator it'll be..

KART
Kart & driver total weight: 250 lbs [113.4 kg] on 22 in [55.88 cm] driven wheels
(weight estimated, I don't know the Manco's weight)

ENGINE
with a engine originally rated @ 6.5 HP running @ 3600 rpm

TRANSMISSION
transmission gear ratio 6:1
Overall gear ratio with series 30 torque converter
LOWEST GEAR 16.2:1 & HIGHEST GEAR 5.4:1

PERFORMANCE
Maximum torque of 153.66 ft lbf [208.33 Nm] in lowest gear and 51.22 ft lbf [69.44 Nm] in highest gear on the driven wheels.
Estimated acceleration: 12.24 ft/s² [3.73 m/s²] reaching top speed in ~5.36 seconds.

Estimated top speed : 43.63 mph [70.22 km/h]

All the calculations are purely mathematical, no real life coefficient has been factored in
(I mentioned it's work in progress right )
So take the numbers as what they are... best guesses based on math

But now for the real life problems you'll encounter.
I think you'll have to reset the TC's driven,
the big rear wheels ask for the low setting to have the best torque for the big wheels for as long as possible,
but the low weight calls for the high setting to not scare your kid with 210 Nm of torque (which is about the same as a 3.0L V6 on it's crankshaft)
So I'm sorry, but you'll have to try and see if it's working or not.

Also: 40mph is a bit fast, isn't it?

'sid

 

[Gator]

Thanks for all that detailed info! Thats nicely put together and helpful.
Yes, 40 will be quite fast, but in our yard it will never be reached.

Ill try it with the 6:1 and see, and go from there.
I found this part # 2182-k, can anyone verify that this will fit a tav? If so this will be a simple solution.

you mention the driven spring preload, looking at the driven pulley while mounted on the engine, which hole would delay high speed?

 

[landuse]

Thanks for all that detailed info! Thats nicely put together and helpful.
Yes, 40 will be quite fast, but in our yard it will never be reached.

Ill try it with the 6:1 and see, and go from there.
I found this part # 2182-k, can anyone verify that this will fit a tav? If so this will be a simple solution.

you mention the driven spring preload, looking at the driven pulley while mounted on the engine, which hole would delay high speed?

Have you got a link for that part # so we can see it?

 

[KartFab]

Make sure you buy the 7" driven unit (not the 6" or 6 1/2"?).

8t,9t, or 10t will all work for even you.
8t is going to be lame speed,but powerful
9t will be alright on speed and have torque
10t may be pushing it, not reccoended.

 

[Gator]

Have you got a link for that part # so we can see it?

ill see if i can link from my phone, if not just copy and paste part number to google, 2182-k sprocket
Click second link

http://www.quickieparts.com/go-kart...ooth-5-8-bore-go-kart-jackshaft-sprocket.html

 

[Gator]

Here are a couple pics, its all ready for her to have for christmas, minus the tav, it hasnt come in yet. I was able to ride it up and down the street, just to test everything, with a little shove i was able to drive it with the cent clutch, so im thinking the 6:1 and tav will be fine for her.


Does this look like a dingo?
The roll cage, bumper and seat are home brew.

Also what hole does the driven spring on the tav need to be in to delay high speed?

 

[firemanjim]

The tav should come with a set up sheet. If not, it comes with customer service #..... Someone here, will eventually answer that question for you. Wish I could help ya. Thats a cool looking kart. Your daughter will love it.....

 

[Doc Sprocket]

Interesting ride! Looks Dingo-ish to me, but I'm not a factory kart guy. With regards to the spring question, have a good look at the way the spring is wound. You want to put the end of the spring in the hole that will make the spring the tightest (increased preload) to delay the high ratio.

6:1 with those big tires (and CVT) is probably right on the edge of acceptable. Try it, and see if it will work with your intended terrain, weight, and driving style.