Double stack- hold the cheese

[PowerDubs_imp]

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-

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.

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And where we are now as the 'before'-

 

[PowerDubs_imp]

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[Phadreus_imp]

PD, you have my nerdy Engineer side all jazzed up now...way cool stuff!

 

[PowerDubs_imp]

More preliminary-

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[E11even_Hunnit]

Are you 3D printing this? If so, what filament are you using?

 

[PowerDubs_imp]

Yes. I'll ask the shop.

 

[tod.branko_imp]

I'll be waiting and line for the product once it's past the R&D phase. Do we get forum discount?

'14 CB1100 STD 5 speed

 

[PowerDubs_imp]

Are you 3D printing this? If so, what filament are you using?

Shop responded- ABS

 

[E11even_Hunnit]

Are you 3D printing this? If so, what filament are you using?

Shop responded- ABS

Shop responded- ABS
Nice!

Curious as to how you generated the cad model itself? I know Lidar technology is making 3D modeling easier these days but not sure if you made it yourself with measurements

 

[PowerDubs_imp]

I am having a shop who has done such products for other bikes take care of the smart stuff.

I am just a simple monkey that will take the bike apart, install, and dyno.

 

[Rox_imp]

103rwhp and 75ft lbs? That's about what I got with the Guhl tune, open airbox and a full exhaust. Weird how tunes are illegal but bigger throttlebodies isn't.

 

[PowerDubs_imp]

Define open airbox? Did you remove the airbox, did you do anything with the stock velocity stacks?

These are still stocked throttle bodies, I am just switching out the velocity stacks for a new design.

I would like to see your dyno chart if your numbers are close to what I achieved.

I haven’t seen anyone else show that they have hit 100whp yet.

Did you do it on the Dynojet?

Do you have the actual run file?

if so I can do an overlay


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[E11even_Hunnit]

In 4 dyno numbers as well...

I too, thought I was easily at the 100WHP mark with Guhls/Exhaust/TSR air funnel, until I found out that PD(with cams) is barely breaking 100HP himself with his setup :huh:

 

[Rox_imp]

Define open airbox? Did you remove the airbox, did you do anything with the stock velocity stacks?

These are still stocked throttle bodies, I am just switching out the velocity stacks for a new design.

I would like to see your dyno chart if your numbers are close to what I achieved.

I haven’t seen anyone else show that they have hit 100whp yet.

Did you do it on the Dynojet?

Do you have the actual run file?

if so I can do an overlay


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Open airbox as in a de snorkel and a slight mod to the venturi opening in the box. Just gives a less restrictive flow of air. These bikes (most Honda 4s) don't like pods and were designed for an airbox.

 

[PowerDubs_imp]

In 4 dyno numbers as well...

I too, thought I was easily at the 100WHP mark with Guhls/Exhaust/TSR air funnel, until I found out that PD(with cams) is barely breaking 100HP himself with his setup :huh:

TSR on the airbox? Or TSR velocity stacks on the TBs?

Depending on the answer- you are probably on either side of 95whp

 

[E11even_Hunnit]

In 4 dyno numbers as well...

I too, thought I was easily at the 100WHP mark with Guhls/Exhaust/TSR air funnel, until I found out that PD(with cams) is barely breaking 100HP himself with his setup :huh:

TSR on the airbox? Or TSR velocity stacks on the TBs?

Depending on the answer- you are probably on either side of 95whp

TSR on the airbox? Or TSR velocity stacks on the TBs?

Depending on the answer- you are probably on either side of 95whp
Stock rear "snorkel" delete w/ TSR funnel inlet housing a HF k&n. I really wanted to believe I was at the 100HP mark but you burst that bubble with your well documented(& dyno'd) setup. And I respect that

 

[PowerDubs_imp]

Do this to your stock stacks- and you will be very close to 100- Improved the velocity stacks

Or wait until I test these new ones I am doing here- and you might get even better results- with plug and play- no grinding needed.

I'm hoping (and expecting) a pretty decent gain over where I already am just by bolting these in...as in -wow, no brainer! gain...

 

[E11even_Hunnit]

Do this to your stock stacks- and you will be very close to 100- Improved the velocity stacks

Or wait until I test these new ones I am doing here- and you might get even better results- with plug and play- no grinding needed.

I'm hoping (and expecting) a pretty decent gain over where I already am just by bolting these in...as in -wow, no brainer! gain...

Yeah, I'm in no hurry to make more power atm. I will happily wait to see your results and root from the sidelines :beerchug:

 

[PowerDubs_imp]

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I am very excited for these.

They will derestrict our TB from the 26mm they are choked at- to allow the full 32mm - and then the new double stack improves airflow beyond the factory single design.

Even on Honda bikes that use the same 32mm TB as our bike- with 32mm stacks from the factory.

The CBR 650 uses the same 32mm TB as our bike- with full 32mm stacks from the factory- on an engine almost half the size.

Going to a double stack design on a stock CBR 650, just swapped in without touching fueling- gained 3whp and no losses.

I’m thinking we may approach closer to 110whp once I get these in.

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[tod.branko_imp]

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I am very excited for these.

They will derestrict our TB from the 26mm they are choked at- to allow the full 32mm - and then the new double stack improves airflow beyond the factory single design.

Even on Honda bikes that use the same 32mm TB as our bike- with 32mm stacks from the factory.

The CBR 650 uses the same 32mm TB as our bike- with full 32mm stacks from the factory- on an engine almost half the size.

Going to a double stack design on a stock CBR 650, just swapped in without touching fueling- gained 3whp and no losses.

I’m thinking we may approach closer to 110whp once I get these in.

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It's done? Put it on a Dyno and stick a price tag sir

'14 CB1100 STD 5 speed