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Old 10-30-2010, 07:45 PM
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Default Gearing for toque converter

I'm going to upgrade to a torque converter this winter, but I want ALOT of torque. I like to putz up hills and stuff slow and with 2 people. would 6:1 be to high?
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Old 10-30-2010, 08:38 PM
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Do you mean too low? There 6:1 is what most production karts run in gearing terms, Yerf-Dog and Manco have a few karts that use a 10t on the jack-shaft and a 60t on the drive (axle), this does not of course take into account for tires but you might want to consider a 8t on the assembly for serious torque.

I do want to warn you however that a torque converter wasn't designed for going up hills or pulling out of ditches, it can burn up belts. If you want true torque without fear of burning belts and you have large tires the answer will be a large engine and a jack-shaft pure chain drive.

The mud slinging beast that was built at the shop a decade ago was just a West Bend 820 with expansion chamber utilizing a jack-shaft. It threw mud everywhere and climbed large hills.

Its just a suggestion, play with the speed calculator and see what works for you top speed wise.

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Last edited by Blazkowiez; 10-30-2010 at 09:10 PM. Reason: additions
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Old 10-31-2010, 11:36 PM
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Default Mega Torque!!!

Hi I am running a Honda GX390 clone (13 hp) in a heavy dirt Kart with a GTC Tav2 converter, 1/2 inch pitch #40 chain, 22inch rears, 10 tooth front sprocket, and an 80 tooth rear sprocket which came from azusa. At first with the 60 tooth rear sprocket we had problems with belts burning up, but with the 80 tooth rear we have no problems at all. It has loads of torque and will climb anything we have thrown at it. I am not sure what the reduction ratio is, but I assume it is 8:1. It has a top speed of about 47km/h which is really fast on our farm tracks. Its really good fun. Here is a vid so you can see for yourself.
Cheers Simon.

Last edited by Camdat67; 10-31-2010 at 11:38 PM. Reason: added ratio.
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Old 11-01-2010, 01:36 PM
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Cool. You got a bigger engine than me, but I don't need much speed.

Quote:
you might want to consider a 8t on the assembly for serious torque
A torque converter will let me putz along at walking speeds with nothing partially engaged, burning up, thats my problem with the Cenrifugal clutch. So if I get an 8 tooth on the assembly and, I should be set. I've only got 15'' tires. I think I'd be ok. With a 5hp, what would be a good torque converter for that, would a TAV be ok? Will one give me more torque over another?


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Old 11-01-2010, 06:31 PM
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A torque converter assembled with lower initial gearing will allow you tremendous torque. I'm not quite sure what your question is from there.

The problem you'll be facing now is I remember from a while ago you said your kart is one wheel drive, then a torque converter is not an option for you.
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Old 11-01-2010, 06:47 PM
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I know but I'm gonna convert to live axle this winter. I'll also get a torque converter. What I was trying to say is:

I like to drive slow (well, sometimes), and I didn't like how you couldn't really drive slow with a Centrifugal clutch.

With a TC, can I drive slow (at a speed where a centrifugal clutch would be partially engaged) for long periods of time without fear of burning anything up?
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Old 11-01-2010, 07:33 PM
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Quote:
Originally Posted by dave1701 View Post

With a TC, can I drive slow (at a speed where a centrifugal clutch would be partially engaged) for long periods of time without fear of burning anything up?
Yes.
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Old 11-06-2010, 07:40 PM
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why wouldnt a torque converter be designed for hills?what do you thin k comes on 99 percent of the utility atvs these days?the auto trannys on these are basically torque converters.im sure the can am outlander 800s and yamaha grizzlys have no problem with hills and what not with their torque converters.Noner of them say "not designed" for hills on them...wtf
a torque converter is your best bet for increasing the mechanical advantage or torque from a smaller motor,or big one as far as that goes.its the easy way to add a tranny per say
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Old 11-06-2010, 07:58 PM
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well all those vehicles also have proper gearing for the size engine/ability of tc, if you mess up the gearing on any vehicle with any tranny it won't work well. a tc is designed to climb hills, but it won't move with bad gearing.
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Old 11-06-2010, 08:04 PM
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so what gearing is decent to climb hills? with 15" tires
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Old 11-06-2010, 09:20 PM
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A 5hp motor and GTC TC? 5:1 or 6:1 would give you plenty of low end because the TC has a low range of like 2.5:1 so combined that would put you anywhere between 12.5 and 15:1 at the lowest. It will then move to 1:1 or .9:1 overdrive and you will assume the final ratio between your JS sprocket and sprocket on the axle like a cent. clutch would give you.
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Old 11-06-2010, 09:36 PM
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Tire height is a big deal too, with 15 inch tall tires 6:1 and a CVT would work great, 22" tires and it wont move if you try to start on a hill with 6:1.
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Old 11-06-2010, 10:21 PM
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I was considering that.
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