kubiac3 Posted November 17, 2006 Report Share Posted November 17, 2006 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. Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted November 17, 2006 Report Share Posted November 17, 2006 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. Quote Link to comment Share on other sites More sharing options...
thegroup Posted November 17, 2006 Report Share Posted November 17, 2006 well put :beer: Quote Link to comment Share on other sites More sharing options...
Animalman294 Posted November 17, 2006 Report Share Posted November 17, 2006 :thumbsup: Quote Link to comment Share on other sites More sharing options...
okbeast Posted November 17, 2006 Report Share Posted November 17, 2006 Nice, I had somewhat wondered that myself. Quote Link to comment Share on other sites More sharing options...
Mullet Man Posted November 17, 2006 Report Share Posted November 17, 2006 (edited) 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 Quote Link to comment Share on other sites More sharing options...
flipcarre Posted November 17, 2006 Report Share Posted November 17, 2006 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. Quote Link to comment Share on other sites More sharing options...
trueraiderfan Posted November 17, 2006 Report Share Posted November 17, 2006 (edited) 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 Quote Link to comment Share on other sites More sharing options...
Polish Posted November 18, 2006 Report Share Posted November 18, 2006 good infoheres 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: Quote Link to comment Share on other sites More sharing options...
thegroup Posted November 18, 2006 Report Share Posted November 18, 2006 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 Quote Link to comment Share on other sites More sharing options...
STLBILL Posted November 18, 2006 Report Share Posted November 18, 2006 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. Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted November 18, 2006 Report Share Posted November 18, 2006 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. Quote Link to comment Share on other sites More sharing options...
Bandit Posted November 18, 2006 Report Share Posted November 18, 2006 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. Quote Link to comment Share on other sites More sharing options...
csrmel Posted November 23, 2006 Report Share Posted November 23, 2006 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. Quote Link to comment Share on other sites More sharing options...
sredish Posted November 23, 2006 Report Share Posted November 23, 2006 Read this, just posted it in the Exhaust section. 2 stroke & 4 stroke design. Quote Link to comment Share on other sites More sharing options...
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