Stock and Modded “can” mufflers vs pipes - an honest discussion without any attitude

[bwalker]

Thanks for the reply. Good to know about the cone angle effecting the duration. If I understand you right, a less steep angle will have more duration, widening the RPM range where the pipe is successfully backstuffing. The tradeoff is the pulse wave is less powerful.

I’m assuming there is still a relatively small range of effectiveness in the piston cycle. Can backstuffing occur with the transfers still open?



He destroyed the old thread pretty quickly, but he did stimulate some other folks to make good posts. It’s a shame the old thread got locked.

And if someone can make a convincing argument for crack-pipes, I’m here for that. A lot of folks in that camp seem high on their own supply, but if it actually makes gains I want to know why.

Crack pipes are the invention of guys like Ironhorse.

 

[bwalker]

The stinger length and diameter are sized to generate pressure in the chamber, which is why a good portion of the length can be inside the chamber. Because of that, I imagine it would be possible to have a side exit. The issue with that is that you would want the entire length of the stinger outside of the chamber so that it wouldn't interfere with the reflected pressure wave.

The stinger can exit on the fat section of the pipe. Its been done before. Memory is a little fuzzy but a snowmobile OEM did so.
The other thing is the stinger can extend well into the middle of the fat section with a traditional exit point. PSI trail blaster pipes where like this. They also sold a mod blaster pipe which was the same measurements but with a stinger that did not extend into the pipe.

 

[srcarr52]

Some race saw guys will whack a big hole out the front and install a square pipe all the way back to the inside of the muffler where it bolts to the cylinder and weld it on both ends

I've done some that way, they are extremely loud and harsh sounding. They seem to favor less ex duration than just a big hole out the front.