T500 Expansion Chambers - Street rider

[Suzukidave]

I wasnt really sure how to describe exactly the deepest point into the chamber you should weld in a stinger .. maybe could have wrote....no further than the opening of the convergent cone ?

[tz375]

I thought I read somewhere (vague enough?) that an internal stinger is quieter (read that a few different places) but that the front face cannot be at the center of the rear baffle which is more or less the tuned average length of the pipe. I don't recall there being an explanation of what happens to make that the case.

It's basically a pressure bleed and I think the idea is that it should be at an area of relatively low pressure, but pressure changes several times per cycle so I'm not sure how they decided on which is the lowest on average.

With say a 12" stinger and say a 9" long muffler, that only leaves 3" inside the baffle cone. Small bikes often have very long stingers and Swarbrick make their pipes with really short stingers - just to confuse us mere mortals.

[Suzukidave]

I knew i read it somewhere .. last part of page 70 and into page 71 http://www.chuckbunnell.com/kart/jennin ... ings10.pdf" onclick="window.open(this.href);return false;

[tz375]

Thanks Dave,

I had checked back in Bell and others, but forgot to go back to Gordon Jennings book.

That is it. OK anywhere but the mid point of the baffle cone. Good find.

[diablo]

I had cut the internal stinger out of my pipes and rebuilt them, it is there to make them more quiet. It makes no difference to the performance of the pipe as long as the stinger is not in the middle of the end cone. The middle of the cone is where the sound wave is reflected back so it will not make any differance as long as you weld it in the begining or the end of the last cone.

[ja-moo]

I ran my stingers up to the front of the baffle cone. It does make a big difference in sound. It dulls the "cackle". And a bit of tinny sound.

http://www.youtube.com/watch?v=GvQS-ZcDn0Y" onclick="window.open(this.href);return false; No silencers at all........

[drøn]

so this is correct?

[tz375]

Correct

[drøn]

also is this a very bad idea?

[tz375]

No. That excellent, but even better is having the stinger above the muffler core pipe. That makes the gas and noise travel further to get out and makes it quieter.