Does your normal centrifugal clutch have one-way bearing?

[iron_monkey]

Hi, just a basic question. With a centrifugal clutch, if you are going at high speed at throttle, and then release throttle, does engine rpm go to idle? or does it match the output rpm?



Ie are the clutches usually fitted with a one way bearing? Or is it a mix of both? or the opposite?

 

[Doc Sprocket]

Clutch will stay engaged until engine drops below engagement speed. After a very short period, engine will idle. No sprag clutches or 1-way bearings.

 

[iron_monkey]

So no engine compression braking effect whatsoever?

 

[Doc Sprocket]

None worth mentioning.

 

[iron_monkey]

good, thanks.

 

[philip metzner]

It will engine break(compression) until the rpm reaches the engagement speed. Hardly noticeable to me.

 

[iron_monkey]

Oh so it will engine break until the go kart slows down to the point where engine rpm is below engagement?

Or can the engine go straight to idle even when you are going fast? Thats the crux of my question.


The reason im asking is that I'm putting an external motorbike gearbox (with no manual clutch), and im relying on the fact that engine is disengaged from the wheels when you let go of throttle and the engine is not doing any work. (no engine braking). In addition I can manipulate engine rpm independent of speed to shift smoothly.

Otherwise gearbox will break when i shift.

 

[OzFab]

Nope, you need a manual clutch...

 

[mckutzy]

You might want to look into what is called a dog clutch. One can be made "simply" from couplers with out the rubber spider in between. You will need a shifter mech to engage off/on though, and a bit of space to make this fit.

 

[fowler]

I assume u are talking of the love joy couplers
Ha that's rough
That would work well but would have a lot of play
U may want to fix some Nilon pads to the couplers

 

[mckutzy]

Alot of transmission have this feature already.

 

[iron_monkey]

I sourced a supplier that sells centrifugal clutches where the input can rotate clockwise and anti clockwise. That should mean it doesn't have a one way bearing?

It doesnt make sense that these clutches have one way bearings, what if the engine suddenly seizes?

 

[B.M.800]

I had a baja minibike where the clutch was worn out to a point where I could rev the engine and it would slow down. I would often go down out driveway that way...

sine I had no brakes that was pretty good lol.

 

[mckutzy]

The reason they dont(most cent clutches, unless specified by the manufacture to have a specific rotation) have a spragg clutches, the clutch sprocket can mounted inboard or outboard to the motor.

should an occasion arise...
If the motors seizes, the revs are going to go down, the shoe pack will contract and not contact the drum. If this did occur, you would feel it for a moment with a screech and other noises, then it will free wheel. Thus no other drive line failure will also occur.

 

[lude]

Oh so it will engine break until the go kart slows down to the point where engine rpm is below engagement?

Or can the engine go straight to idle even when you are going fast? Thats the crux of my question.


The reason im asking is that I'm putting an external motorbike gearbox (with no manual clutch), and im relying on the fact that engine is disengaged from the wheels when you let go of throttle and the engine is not doing any work. (no engine braking). In addition I can manipulate engine rpm independent of speed to shift smoothly.

Otherwise gearbox will break when i shift.

if you are using a fukk motorcycle gear box, it should already have a clutch in it, just use that clutch, it would work fine, i have seen z50 gear boxes used before and have even done it myself once, just directly chained to where the flywheel would be,