Jackshaft gear ratio

[Casey4401]

I’ve got a go cart with a jack shaft and it keeps burning clutches , what’s wrong with it.?? it’s got a 10t clutch to a 14t sprocket on the jackshaft and then a 14t sprocket to a 70t sprocket

 

[Casey4401]

 

[Whitetrashrocker]

Way to big of a kart for a centrifugal clutch. You need a torque converter.

BTW. 10>14>14>70 make a 7:1 gear ratio. The 14s cancel out cause it's a 1:1 in to out ratio.

 

[Denny]

That kart should have a 30 series CVT on it. It was probably born with a 20 series on it. And oil that chain after you replace it with new!

 

[Casey4401]

That’s what I thought , I’ve got a torque converter for it , but without lifting the motor 5-6 inches , there’s not enough clearance for it

 

[bob58o]

10T to 20T
10T to 70T

14 : 1 overall reduction.
I assume 18” tires.
4.71 feet per axle revolution.
1800 rpm clutch engagement?
With 14 :1 gear reduction and 18” tires…
@1800 RPM velocity is about 7 mph.
Under 7mph, your clutch will be slipping and burning.

With your current gearing (10T to 14T, 14T to 70T) and 7:1 reduction….
1800 rpm would be about 14mph, meaning traveling under 14mph results in slipping and burning.

Accelerating from a stop = burned clutch
Slow travel = burned clutch
Stop and go = burned clutch
Hills = burned clutch
Riding the brake = burned clutch

Changing that critical speed from 14mph to 7mph will improve clutch life, improve torque, improve acceleration (up to a a certain speed),
but will cost you top speed.

Lower engagement rpm clutch (stall speed) will help.
Smaller diameter tires will help
CVT or TAV will help.
All gas no brakes will help.
Once you get moving, just keep going!

14:1 total gear reduction with 18” tires means top end speed will be limited to like 20 mph at 5200 rpm. This is why anything with tires larger than 16” really needs the variable speediness of the CVT.

 

[bob58o]

As per usual, the solution is Mo’ Throttle Baby!
Burned clutch, Mo’ throttle!
Understeer, Mo’ throttle!
Police chase, Mo’ throttle!

 

[Denny]

That’s what I thought , I’ve got a torque converter for it , but without lifting the motor 5-6 inches , there’s not enough clearance for it

Sounds like you better get to engineering then so you don’t have to do that!

 

[bob58o]

What clutches are available with low stall speeds? Only $200 clutches?

 

[Casey4401]

10T to 20T
10T to 70T

14 : 1 overall reduction.
I assume 18” tires.
4.71 feet per axle revolution.
1800 rpm clutch engagement?
With 14 :1 gear reduction and 18” tires…
@1800 RPM velocity is about 7 mph.
Under 7mph, your clutch will be slipping and burning.

With your current gearing (10T to 14T, 14T to 70T) and 7:1 reduction….
1800 rpm would be about 14mph, meaning traveling under 14mph results in slipping and burning.

Accelerating from a stop = burned clutch
Slow travel = burned clutch
Stop and go = burned clutch
Hills = burned clutch
Riding the brake = burned clutch

Changing that critical speed from 14mph to 7mph will improve clutch life, improve torque, improve acceleration (up to a a certain speed),
but will cost you top speed.

Lower engagement rpm clutch (stall speed) will help.
Smaller diameter tires will help
CVT or TAV will help.
All gas no brakes will help.
Once you get moving, just keep going!

14:1 total gear reduction with 18” tires means top end speed will be limited to like 20 mph at 5200 rpm. This is why anything with tires larger than 16” really needs the variable speediness of the CVT.

What if I put a 30t sprocket in place of the 14 on the clutch side.?

 

[Rat]

What if I put a 30t sprocket in place of the 14 on the clutch side.?

What if? Do you even have room for that approximately 6" sprocket that will need additional clearance?

Starting to sound a bit like my Ducar 212 powered freakshow... Obviously I know youre referring to a kart.

10-52/ 28 (or 36 if I want) to a 6speed gear cluster 32-12