second bell alternative

Anyone experiment with increasing the horizontal flue run to say 14" on a short bench run rather than using a secondary bell? Basically the same thing, just thought I would see if anyone had done something like this. If you had an 8" system that ran six feet, switch to 14" ducting for a yard or so, then switched back, would it perform the same as with a bell? I've only ever built a standard 8" without any secondary bells so this it outside my experience.

Something along those lines?

http://s65.photobucket.com/user/mremine/library/NYC%20Rocket%20Stove%20Build?sort=3&page=1

Thanks for the link. I've seen the NYC Rocket Stove build in the forum before and is probably what made me think of using a larger diameter just recently, I just couldn't place where I had seen it or if I had dreamed it instead. Thanks again. I'll post photos if I build