Which Is More Powerful: 2 Piston or 4 Piston Engines?

[otomanb]

suppose a bike which has 2 piston engine and other is 4 piston. which one is most powerful?
thanks

 

[mgb_phys]

Depends on the capacity of the cylinders - you can build high power 2 cylinders and low power 4 cylinders.

Other than that it's a design decision.
2 cylinders are smaller and simpler, 4 cylinders allows a smaller capacity/cylinder so they can move faster and so rev higher.

 

[brewnog]

Bikes painted red are always faster than bikes painted yellow.

 

[mgb_phys]

Bikes painted red are always faster than bikes painted yellow.

Unless the yellow ones have noisier exhausts

 

[otomanb]

Bikes painted red are always faster than bikes painted yellow.

what is the reason behind that?


let me explain in different manner,
A bike of 100CC with 4 stroke engine
a bike of 100 cc with 2 stroke engine

Now which will be more powerful and fast

 

[xxChrisxx]

Bikes painted red are always faster than bikes painted yellow.

what is the reason behind that?let me explain in different manner,
A bike of 100CC with 4 stroke engine
a bike of 100 cc with 2 stroke engine

Now which will be more powerful and fast

The one where the driver only ate half his burger for lunch.

It's a totally pointless question, as it relies on so much more than how many cylinders it has. Tuning, gearing, size, weight etc etc etc.

 

[brewnog]

The one where the driver only ate half his burger for lunch.

It's a totally pointless question, as it relies on so much more than how many cylinders it has. Tuning, gearing, size, weight etc etc etc.

Indeed, there are far many more variables than number of cylinders and capacity, making yours an impossible question to answer (hence my comment about colour). If you have a quick look round here there are some excellent posts on all the things which go into engine power output and vehicle speed.

 

[Lsos]

let me explain in different manner,
A bike of 100CC with 4 stroke engine
a bike of 100 cc with 2 stroke engine

Now which will be more powerful and fast

2 stroke engines are generally more powerful than 4 stroke engines...

 

[xxChrisxx]

Oh, I really fail. I'm sorry OP you changed and clarifired the question, but I just read it as 2 cylinder 100cc not 2 stroke.

2 strokes are more powerful because each cylinder fires every crank revolution, as opposed to firing once every 720 deg in a 4 stroke. EDIT: In general.

 

[brewnog]

But it's a generalisation, there are plenty of four stroke engines more powerful than two strokes of the same capacity.

The answer is: "It depends".