09-16-2021, 05:07 AM
As some of you know- our bikes have 32mm throttle bodies but neck down to 26-27 mm by inserting narrow velocity stacks deep into our TB to choke it down (sorry I forget the size exactly- been a while since I measured).
The TB themselves have a lip cast into them to accept larger ‘normal’ stacks as these same castings are used in several other bikes without the choking- meaning they have larger velocity stacks- even on much smaller bikes.
TSR has larger stacks for our bikes made that fit into the groove- but are pretty expensive.
I have had good results just by boring the ID of the stock plastic stacks- but as always, a hot rodder wants more.
Thing is- I try to be an intelligent hot rodder- and gain power without sacrifice. That is much more difficult.
To date- I have achieved 103whp and over 75wtq.
I could just get the TSR stacks to open up the breathing- would probably gain hp- but might drop a little tq.
What if I could possibly improve both?
That brings us to where we are now-
![[Image: 1b953dac8caf9df826ff08b5045e66b5.jpg]](https://cb1100forum.net/forum/uploads/imp/202109/1b953dac8caf9df826ff08b5045e66b5.jpg)
Many more expensive high end sport bikes have used dual stack for years now to have both high end flow but maintain velocity at lower revs.
Like anything else- it’s not that Honda wasn’t aware of this- they just didn’t see a need, or cost.
I’m pretty excited about this one.
![[Image: 45248077da5b90edfb700709fe123a76.png]](https://cb1100forum.net/forum/uploads/imp/202109/45248077da5b90edfb700709fe123a76.png)
Sent from my iPhone using Tapatalk
And where we are now as the 'before'-
![[Image: 38f58eb25b1c3682e8747b7d18483c45.jpg]](https://cb1100forum.net/forum/uploads/imp/202109/38f58eb25b1c3682e8747b7d18483c45.jpg)
The TB themselves have a lip cast into them to accept larger ‘normal’ stacks as these same castings are used in several other bikes without the choking- meaning they have larger velocity stacks- even on much smaller bikes.
TSR has larger stacks for our bikes made that fit into the groove- but are pretty expensive.
I have had good results just by boring the ID of the stock plastic stacks- but as always, a hot rodder wants more.
Thing is- I try to be an intelligent hot rodder- and gain power without sacrifice. That is much more difficult.
To date- I have achieved 103whp and over 75wtq.
I could just get the TSR stacks to open up the breathing- would probably gain hp- but might drop a little tq.
What if I could possibly improve both?
That brings us to where we are now-
Many more expensive high end sport bikes have used dual stack for years now to have both high end flow but maintain velocity at lower revs.
Like anything else- it’s not that Honda wasn’t aware of this- they just didn’t see a need, or cost.
I’m pretty excited about this one.
Sent from my iPhone using Tapatalk
And where we are now as the 'before'-
![[Image: 22949b0f7796b69c1b47ecfc010dbff8.jpg]](https://cb1100forum.net/forum/uploads/imp/202109/22949b0f7796b69c1b47ecfc010dbff8.jpg)
![[Image: 7904f29f550ce7aaa6d37ba12391f392.jpg]](https://cb1100forum.net/forum/uploads/imp/202109/7904f29f550ce7aaa6d37ba12391f392.jpg)