custom exhaust

[richmoja]

could you take the exhaust off a lawnmower and put it on a moped(zuma)


what would it do.

[hybridrazz]

It would just be slow with a 4 stroke lawn mower muffler, or no faster then the stock pipe. The expansion pipe is the best design for a 2 stroke engine,if you want a good basic pipe get a leovince zx, or one of the technigas pipes.

[Lennox]

i think StepVino tried a variation of that......... maybe he will chime in....

[burnt_toast]

i think StepVino tried a variation of that......... maybe he will chime in....

xcept he put it on the intake side.. lol

[richmoja]

what if i made a custom dual exhaust and put two silencers on the ends

[Squid121]

what if i made a custom dual exhaust and put two silencers on the ends

Unless you have experience making tuned exhausts for a two stroke engine leave it alone or buy an aftermarket one. The stock exhaust on your scooter is tuned for your stock engine to give the most power throughout the rpm range. Without changing other things like rollers, clutch springs, torque driver spring, or even changing the jetting if necessary, significant changes to the exhaust will cause performance and reliability to decrease and the only thing you will change is the look and sound.

[rydah]

the twin pipes dont do anything, its just a waste of time.

[Skullet]

not quite the same thing, but my 4t elite 80 had a mower muffler welded onto the pipe and i was told thats quite possibly the reason it blew up.

[StepVino]

xcept he put it on the intake side.. lol
:)
http://www.provoscooter.com/vbull/attachment.php?attachmentid=3313

There was a thread a while back, but can't find it. Someone
drilled a hole a few inches back from the tail end of the muffler,
and added a pipe with another muffler. Looked pretty bad till
they painted it, but it performed better.

[adrive7]

Rich,

The exhaust on a 2 stroke engine is specially tuned to work with that engine. By using an expansion chamber, basically the exhaust gasses bounce off the far wall and come back up the exhaust pipe before the next compression stroke, getting to the cylinder just as the exhaust port is sealed.

Because of the two stroke engine design, there is a period of time when both the intake and exhaust ports are open. This means that unburned fuel is being dumped out the exhaust. The expansion chamber is tuned so that the exhaust gas pushes the unburned fuel back into the cylinder so all of it is burned. The RPM range where this happens best is the powerband where you feel the bike pull hard. 2-stroke dirt bikers, for example, always keep their bikes in the power band and manage acceleration using the clutch.

Changing the exhaust to anything other than one made specifically for your engine will give you worse performance.

Here is a gif image that should help. Fuel is green, exhaust is gray.

http://upload.wikimedia.org/wikipedia/commons/5/52/Arbeitsweise_Zweitakt.gif