Exhaust no muffler on a 2 stroke?

[motorpsycho]

i know that you can gain a bit of power by letting the exhaust breathe better. (as well as letting the intake breathe better too)but, how much exhaust backpressure do these little 2 strokes require in order for them to run "right"?
i'm wanting to ditch the stock muffler because it seems so restrictive. i want to run a long straightpipe without the muffler instead. would loosing the muffler affect low end power that much?
i know it'll be loud, but that's ok....i like loud.

 

[biken stins]

engine will last longer with a baffel also will add to top speed.
Straight pipe lowers top speed,bike is quicker.

 

[Mountainman]

good advice from stins there

engine will last longer with a baffel

good advice from stins

have never seen using a straight pipe on a 2-stroke to be a good THING

they sure do sound good on a Honda 90 though !!!

as we ride those THINGS

 

[customcruiser]

ive run no exhaust on my bmx tijuana 66cc and skate board i noticed a 20percent increase in accelaration and speed but loudness i cant hear ppl talking after a 2hour ride and makes fuel economy abit worse but i want power my boards engine completely fell off at 40kmh and i fell off in the middle of the road cars were comin along at 60kph and were 80meters from me so ive replaced the 32cc with a 49cc pocket bike engine i had shud get more power now still gotta make a chain idler for it tomoz

 

[AussieJester]

ive run no exhaust on my bmx tijuana 66cc and skate board i noticed a 20percent increase in accelaration and speed

20% WoW and what method was used to get this figure? seeing the baffles on two strokes actually ad to performnce and all...
Playing with expantion chamber size baffle/stinger length is where the HP comes from in two strokes not remvoing them

 

[Bikewer]

Two stroke exhaust tuning can be complex. Racing engines with tuned expansion chambers are set up so that the exhaust provides a "resonant pulse" back to the still-open
exhaust port to keep the incoming charge of air/fuel in the combustion chamber.

Engines set up with simplified exhausts tend to have more low-end torque; this was standard on "trials" motorcycles for many years.
It's mostly trial and error for the home builder who doesn't have access to fancy measuring devices.

 

[nadroj]

if you want to run just a straight pipe you will be fine.

 

[nadroj]

20% WoW and what method was used to get this figure? seeing the baffles on two strokes actually ad to performnce and all...
Playing with expantion chamber size baffle/stinger length is where the HP comes from in two strokes not remvoing them

that is only if it has an expansion chamber, if the exhaust is just a mufler anything would be better than that

 

[graucho]

With the cheap finicky nature of the HT engine I think air flow and back pressure too far "out of the norm" would result in a big KA-BOOM! after a few hundred miles. Im not talking all 2 strokes, just the HT engine. Yet im all for experimentation, at the price of these engines.....go for it and report back.

 

[wheelbender6]

Straight pipes are not very neighborly.