The CB1100 Community Forum

for whoever has an opinion on this: help me refine my search. i'm looking at a one-piece exhaust that's hand bent, vs a header/slip-on combination that's not hand bent. is there a significant difference that's measurable?

I believe this is what you are looking for: Ruyjin Exhaust from Japan

http://ryujin-japan.jp/bike/other/cb1100rs.html


[url=https://uphinhnhanh.com/image/3Lj5yR]

(09-15-2018, 12:34 PM)misterprofessionality_imp Wrote: [ -> ]for whoever has an opinion on this: help me refine my search. i'm looking at a one-piece exhaust that's hand bent, vs a header/slip-on combination that's not hand bent. is there a significant difference that's measurable?

(09-15-2018, 09:09 PM)itstuantran_imp Wrote: [ -> ]I believe this is what you are looking for: Ruyjin Exhaust from Japan

http://ryujin-japan.jp/bike/other/cb1100rs.html


[url=https://uphinhnhanh.com/image/3Lj5yR]

(09-15-2018, 12:34 PM)misterprofessionality_imp Wrote: [ -> ]for whoever has an opinion on this: help me refine my search. i'm looking at a one-piece exhaust that's hand bent, vs a header/slip-on combination that's not hand bent. is there a significant difference that's measurable?

Actually, no, not really. that one is way way more expensive than the ones i've been looking at. I'm aware of that exhaust but i've specifically scratched it off my list for price reasons. it's almost $2500, while the ones I've been looking at are less than $1500.

I'll repeat my question to stay on topic though: given a hand-bent one piece exhaust and a non-hand-bent header/slip on combo, what is the difference?

Hand-bent flows better, fits better, looks better, and have better ground clearance than machine made. Race bikes run hand-bent so it’s obvious what sounds better. Hand bent costs more, too.
I have a used in perfect condition CB1100 Yoshimura full titanium hand bent exhaust for sale $999 shipped. Look in the classifieds.

I ask because I really don’t know: why would a hand-bent pipe necessarily flow better?

Usually smoother bends, more gentle arc for the exhaust gasses to pass thru

I see. so slightly better performance, and slightly better sound. How much of a difference are we talking about here? because according to my research it's about a 15% price difference, all other things being equal.

If you see how they make the hand bent pipes, i thinks the difference in cost is much in the workmanship. It's more aesthetic compared to machine bent pipes as well. For performance and scavenging, only experts with tests can tell how much difference in sound and performance.
https://www.youtube.com/watch?v=A-gX-GQCk5k

(09-16-2018, 01:44 PM)itstuantran_imp Wrote: [ -> ]If you see how they make the hand bent pipes, i thinks the difference in cost is much in the workmanship. It's more aesthetic compared to machine bent pipes as well. For performance and scavenging, only experts with tests can tell how much difference in sound and performance.
https://www.youtube.com/watch?v=A-gX-GQCk5k

The skill of the bender in that video was fascinating. At teh very beginning, you could see a bar pushed inside the tube. I wonder if the bar was connected to a series of round mandrels that would prevent the pipe from kinking. Or was it just a characteristic of the titanium material or the very gradual bend. In any case, it makes for a beautiful pipe, well worth a 15% price premium.

For sale
http://cb1100forum.com/forum/showthread....#pid218544