Gearing to sling mud all over the place.

[jace]

I have a manco 485 go kart with 16 inch tires and a tecumseh 6 hp whats the lowest i could gear it with still having a speed of around 20-25MPH i dont really care for speed anymore, but i want somethiung that will throw mud all over the place

 

[Blazkowiez]

http://www.diygokarts.com/speed-calculator.html

 

[jace]

Thats useless, i have a jackshaft.

 

[Blazkowiez]

You're welcome.

 

[jace]

i never said thank you, you never answered my question.

 

[Blazkowiez]

Awesome, have a good day.

With a 6hp Tecumseh you won't be able to achieve gearing that will ever spin out the tires or sling mud and achieve 25mph. I was attempting to help you out with the gear calculator knowing full well you have a Torque Converter giving you told me you have a Manco 485, if it was using a standard centrifugal clutch it would be a 475.

So basically, your 485/Red Fox II/Gold Class II, LXT, etc model kart will not do what you want it to unless you buy a larger motor or gear the kart to basically do 10mph on top speed.

 

[jace]

that helps a little more, thanks. it use to have a torque converter but the driven is distroyed so i just put a centrifical until i get the money for a torque converter what size motor do you think could achieve spinning the tires with that decent speed.

 

[redsox985]

About a 500cc street bike motor that's geared low. How did you trash your driven and why didn't you try to fix it?

 

[jace]

i didnt trash it, it wasnt fixable ill take pictures of it tommorow you'll see its terrible.500cc street bike motor to spin the tires in dirt.no way. i had a little red advedure cart with a 5 horsepower honda that spun the tires all over the place in dirt.

 

[Blazkowiez]

I've only seen 1 or 2 out of several hundred torque converter clutches that are not repairable in any manner.

 

[modelengineer]

Bike engine, no doubt. Mine has a 500cc streetbike motor and it spins the wheels on dirt through 4th gear and has a reasonable top speed of 130 kph. 0-100kph ~5.5 secs, no industrial engine even comes close.

I'd go for a 250cc though, unless you find a bigger one cheap.

 

[r97]

multiply the two ratios (engine to js, and js to axle) then throw that into the calculator, if your too lazy to do the math (engine rpm/gear ratio*tire circumference*60/5280) go to these websites,
http://www.diygokarts.com/speed-calculator.html
http://gokartguru.com/engineering_tool_kit.php
http://www.compgoparts.com/TechnicalResources/JackshaftRatioCalculator.asp
http://www.rbracing-rsr.com/gearspeed.html

 

[redsox985]

0-60mph in 5.5 is good for most production cars, probably scary in a kart.