I have a question .

[Explicit Error]

The more teeth in the sprocket the quicker it goes?
or vise versa? And the chain Should you get a bigger chain or smaller ?

 

[kibble]

Depends on which sprocket. If more teeth on the driver sprocket and the driven stays the same, then yes, more speed and vice versa.

 

[Explicit Error]

O0h ok . I was stuck on that thanks

 

[kibble]

But remember, with increased speed, you have decreased power. That's if you're using a regular clutch. With torque converter it doesn't matter much.

 

[oscaryu1]

Decreased torque you mean right?

Off topic: How would a 1:4.5 gear ratio do?

 

[Explicit Error]

Okay . And what exactly is a tourque converting like . where does it go i knoe what it does .

 

[kibble]

Decreased torque you mean right?

Off topic: How would a 1:4.5 gear ratio do?

Yes, that's what I meant.

I don't know, I think I currently have my kart set at 1:3.35

 

[oscaryu1]

Yes, that's what I meant.

I don't know, I think I currently have my kart set at 1:3.35

Poor clutch

 

[kibble]

Yeah, I know. I currently have a 14 tooth on the clutch and 47 on the diff. I have a 10 I could put on the clutch, which I was planning on trying it out to see how noticeable the difference is.

A torque converter consists of two pulleys which change their ratios depending on the speed they're rotating at. One goes on the engine's output and the other goes to the wheels through a chain.

 

[modelengineer]

1 : 3.35??? Are you trying for a new land speed record, sheesh! lol j/k

Mine's at 1 : 8.8, but I have a 2-stroke so it revs higher.

 

[oscaryu1]

But 2 strokes also make more power... you could live with a 1:4 ratio if you have a good clutch.

 

[modelengineer]

2 strokes have LESS torque, and therefore LESS power at low revs, but they make more power because they rev higher, and produce more torque than equivalent 4-strokes at high RPM.

+ the engine im using is a gutless 3.5hp tecumseh cast iron block. I had it geared 1 : 4.5 but it was basically idling at the max speed i wanted and i couldn't slow down (stall) and i couldnt speed up (not enough power).
1:8.8 gives me max speed of around 40kph (the engine just wont push it any faster on the flat, its not that it hits max revs), and that's plenty fast enough for me.

 

[Kenny_McCormic]

2 strokes have LESS torque, and therefore LESS power at low revs, but they make more power because they rev higher, and produce more torque than equivalent 4-strokes at high RPM.

If a 2 stroke has less torque why are they the only engine you will find in a power tool that requires mass amounts of torque such as a chainsaw? Please do explain why it would have less power, its all in the pipe on a 2 stroke when picking what powerband you want.

2 stroke fires once every revolution, a 4 stroke fires once every 2 revolutions, therefore a 2 stroke engine of equivalent displacement will have over double the power of a 4 stroke because of the power loss during a 4 strokes exhaust stroke. Believe what you want but thats what I find to be true.

 

[Russ2251]

Could not have said it better myself.
I easily spin tires at low rpm (from dead stop).
Love this website.

 

[Magice]

If a 2 stroke has less torque why are they the only engine you will find in a power tool that requires mass amounts of torque such as a chainsaw? Please do explain why it would have less power, its all in the pipe on a 2 stroke when picking what powerband you want.

2 stroke fires once every revolution, a 4 stroke fires once every 2 revolutions, therefore a 2 stroke engine of equivalent displacement will have over double the power of a 4 stroke because of the power loss during a 4 strokes exhaust stroke. Believe what you want but thats what I find to be true.

That's exactly what I was thinking the other day..
I was wondering what gives a 4 stroke "more torque"

 

[modelengineer]

There are many factors which affect torque and power and I think it was wrong of me to generalize the two types.
But, generally speaking, 2 strokes have less torque at low revs, and more torque at high revs
4 strokes have more torque at low revs, and less torque at high revs
Since power = torque x RPM, 2 strokes generally have more power.
I have an open mind and if someone proves me wrong then I will accept it completely, but this is how I understand it.
Both types of engines can be made to have different characteristics. Ag bikes have 2 stroke engines which have HUGE amounts of torque, and formula 1 cars have 4 strokes which make HEAPS of power. It's all in how the engine is designed.

 

[Kenny_McCormic]

Both types of engines can be made to have different characteristics. Ag bikes have 2 stroke engines which have HUGE amounts of torque, and formula 1 cars have 4 strokes which make HEAPS of power. It's all in how the engine is designed.

Thats a good blanket statement.

 

[Magice]

From what I see it, 2 strokes are generally said to be less torquey because a 5hp 2 stroke has a smaller piston than a 5hp 4 stroke. I think it's how horsepower is measured.

A 4 stroke and a 2 stroke with equal displacement. The 2 stroke will win no matter what in torque, and speed.

edit: unless the 4 stroke has something I don't know about that magically gives it more power at the same displacement ..