I was thinking today..

[kubiac3]

I was wondering why there is a difference between 2 stroke pipes and 4 stroke pipes. Im just curious and would like to find out why. Just super curious.

 

Thanks.

[jbooker82]

Cuz 2 Strokes dont have valves and four strokes do.

 

The exhaust pipe on a 2 stroke helps hold in the fresh fuel and air mixture by a pressure wave. The pressure wave comes out of the exhaust port in to the pipe and reflects back twards the engine's exhaust port. It reflects off the exhaust pipe were it starts to neck back down. That is why different shape pipes have such a drastic affect on where your banshee builds its power at a certian rpm range. Certian pipes seal more better at certian rpm ranges. Drag Pipes seal best at high rpms. That is why you feel that hard hit at higher rpms than say an all around pipe like T5's. T5's seal better at a lower rpm range. That is why they are a better sutied for all around riding. Now mix in all the different manufactures and that is why there are so many choices out there.

 

Four strokes have exhaust vavles that keep the fuel and air in while it is on the compression stroke. It doesnt use pressure waves to seal up the exhaust port unitl the piston has it sealed off.

[thegroup]

well put :beer:

[Animalman294]

:thumbsup:

[okbeast]

Nice, I had somewhat wondered that myself.

[Mullet Man]

good info

heres some more how a 2-stroke works @ howstuffworks.com

little bit more on pipes here , here and here

Edited November 17, 2006 by Mullet Man

[flipcarre]

Cuz 2 Strokes dont have valves and four strokes do.

 

The exhaust pipe on a 2 stroke helps hold in the fresh fuel and air mixture by a pressure wave. The pressure wave comes out of the exhaust port in to the pipe and reflects back twards the engine's exhaust port. It reflects off the exhaust pipe were it starts to neck back down. That is why different shape pipes have such a drastic affect on where your banshee builds its power at a certian rpm range. Certian pipes seal more better at certian rpm ranges. Drag Pipes seal best at high rpms. That is why you feel that hard hit at higher rpms than say an all around pipe like T5's. T5's seal better at a lower rpm range. That is why they are a better sutied for all around riding. Now mix in all the different manufactures and that is why there are so many choices out there.

 

Four strokes have exhaust vavles that keep the fuel and air in while it is on the compression stroke. It doesnt use pressure waves to seal up the exhaust port unitl the piston has it sealed off.

 

Very well put, here's a little picture that i found that might help out.

[trueraiderfan]

So some of the exhaust actually goes back into the cylinder? I guess I really do not get how that helps or why that is necessary.....?

 

Ok OK NOW I GET IT never mind.

Edited November 17, 2006 by trueraiderfan

[Polish]

good info

heres some more how a 2-stroke works @ howstuffworks.com

little bit more on pipes here , here and here

 

 

 

thats some good info......I had always wondered how it woks ........thanks :thumbsup:

[thegroup]

So some of the exhaust actually goes back into the cylinder? I guess I really do not get how that helps or why that is necessary.....?

 

Ok OK NOW I GET IT never mind.

it helps create more compression kindof like when the values r close on a 4-joke

[STLBILL]

Who rattled JBooker82's cage? Someone should have done it before now... :thumbsup: I've seen this question answered in a much more confusing manner.

 

The one thing missing off that two-stroke diagram is a color legend. I always believed the best part was how someone took the time to color the fuel, air, fuel/air, spark/combustion and exhaust!

 

Now, I want to know why my tiny weed trimmer doesn't have a pipe like a Banshee. The displacement can't be the answer because tiny R/C two-stroke engines have a pipe like a Banshee.

[jbooker82]

Who rattled JBooker82's cage? Someone should have done it before now... :thumbsup: I've seen this question answered in a much more confusing manner.

 

The one thing missing off that two-stroke diagram is a color legend. I always believed the best part was how someone took the time to color the fuel, air, fuel/air, spark/combustion and exhaust!

 

Now, I want to know why my tiny weed trimmer doesn't have a pipe like a Banshee. The displacement can't be the answer because tiny R/C two-stroke engines have a pipe like a Banshee.

 

Naw I was just trying to explain it with out confusing him more.

 

Your weed wacker doenst have a tuned pipe because it was desined to have a muffler (quiet) at the cost of power. Why dont you get a tuned pipe that is made for some large scale 32cc RC's.

 

Conventional 4 Stroke engine.

 

 

Wankel Rotary Engine Like in the Mazda RX-8's

 

 

Gnome Rotary Engine. By far the wierdest engine. They Cylinders actually rotate around the crank. The crank stays stationary. The valves are in the pistons. Just follow the cylinder around with the Green Con Rod.

[Bandit]

i have a 90 Polaris and it has a straght pipe with muffler. So if I put a tuned pipe on it, it would make more power? my son would love that.

[csrmel]

if it just has a straight pipe on it now and you upgrade to a real expansion chamber thn it would be a big difference.

[sredish]

Read this, just posted it in the Exhaust section.

 

2 stroke & 4 stroke design.