Exhaust Open exhaust

[redpiper777]

Hi I'm working on a board track racer and thought of making a custom exhaust that will carry more toward the rear of the bike...Not much of a muffler, more like an open straight pipe..I know it will be loud but does anyone know the pro's and con's to running an open pipe like this?

Thanks

 

[fetor56]

About the only pro i can think of is it will be cheaper.The cons are you'll seize the engine;rather quickly.
2-strokes are more touchy than 4-strokes but even then they both need that back pressure in order to operate properly.

 

[redpiper777]

Nuff said, that crazy idea is dead. Thanks

 

[fetor56]

Nuff said, that crazy idea is dead. Thanks

NP...see what other ppl say cos i'm no exhaust expert but that's my understanding of things(a certain amount of back pressure is absolutely necessary)

 

[Mountainman]

wonder where that back pressure video went ?

(a certain amount of back pressure is absolutely necessary)

yes - especially with the two stroke

sorry - but - I am not sure where - here on site I saw
a very cool video explaining importance of back pressure 2-stroke

ride that thing

 

[jlebh1]

so how bad would it be to run a 2 stroke without the muffler just strait pipe bent to the style of the frame cause I want to do that to my HT on a stingray type bike

 

[SimpleSimon]

Not too bad if you can afford to replace the engine every 30 days or so, depending on how much you ride it. Back pressure in the exhaust system is an absolute necessity to running the engine - in its absence you'll burn it up pretty quickly.

 

[macarollo]

On my HT engine one day my baffle flew out... I rode the rest of the day with an open pipe. It was sooooo insanely loud. People everywhere were staring at me. I think on these machines it is best for them to be quiet. Don't want to get a noise pollution ticket.

 

[BSA]

Get a Grubee long chrome pipe.
Youll see them on several websites.

BSA

 

[Gungatim]

If you want the look of straight pipe, but still want to have backpressure, take a washer, and grind down the OD to fit inside the pipe. Then just weld it in, either at the end or some place where there's a joint. The washer's ID will restrict the flow some, and create backpressure. If it is not enough, take a piece of smaller diameter pipe with a cap on the end (or just crimp it), weld to the washer, then drill small holes in the pipe to allow some flow of exhaust. Insert the pipe end of the assembly into the pipe and weld the washer end in the pipe as described earlier.

I did this with a tecumseh 2-stroke and it worked slick, nice sound too!