3D Printed Velocity Stacks

[Guest]

Hi Folks,

Myself and two other Engineering students have started a small 3D Printing and Design Business. Our passion is motorcycles and cars and we are constantly looking to innovate and reduce costs associated with the hobby.
We have recently been working on designing and testing intakes for old motorcycles and our first prototype is these velocity stacks for my Yoshi GS "750".

These stacks are great for performance/racing applications. I installed and tested them on my Yoshi GS"750" and noticed an increase in roll on throttle response and overall torque in comparison to the K&N pods. The advantage of additive manufacturing in comparison to standard machining is that changes in the design can be easily made and a working prototype produced within hours. Therefore, we plan on making multiple iterations of intakes that vary in length and geometry in order to match the riders characteristics. Longer intake runners will result in a broader torque range, whereas shorter ones will compliment high rpm performance.

In the near future we will be able to test the models flow characteristics using computation fluid dynamics software to compare the increase in flow we are able to achieve in comparison to K&N pods, for example.

We are also working on designing a full air box that allows for easier removal and installation of the carbs for people that prefer to retain factory appearance and filtration to that of the stock air box.

The stacks fit perfectly on VM26's. If anyone is interested in a set for these carbs or any other for that matter we would be more than happy to design more models.

Shoot me a PM or email us at info.empsolutions@gmail.com


If anyone needs anything else designed and/or printed we are more than happy to provide you with a quote.

Let me know what you guys think! Any suggestions are more than welcomed.

 

[Guest]

Pics

 

[Guest]

Pics

 

[Guest]

more

 

[Guest]

Last one ...

 

[Guest]

So what are you using for filtration? We have a lot of bugs and crap in FL that suck getting hit by while riding, but I would hate to get that stuff in my engine. How about a 4-1 tube set up for a large K&N. Maybe a ram air scoop set up coming from the sides for some forced induction.

 

[Guest]

Yup that is the plan! These stacks are not ideal for street use as like you mention there is no filtration.

Purpose of designing and testing these was to confirm that the material we use (PETG) can withstand the intake temps, as well as ensure the mounting mechanism and carb spacing is correct.

With all of those factors confirmed, we are going to work on a plenum designed airbox that will provide the same if not more laminar airflow than these stacks provide.

 

[scratch]

Is PETG fuel resistant?

Yup that is the plan! These stacks are not ideal for street use as like you mention there is no filtration.

Purpose of designing and testing these was to confirm that the material we use (PETG) can withstand the intake temps, as well as ensure the mounting mechanism and carb spacing is correct.

With all of those factors confirmed, we are going to work on a plenum designed airbox that will provide the same if not more laminar airflow than these stacks provide.

 

[Guest]

Yup! We've left some sample parts in gasoline for weeks and it was not affected at all. We have purchased another printer that is capable of printing Nylon and Polycarbonate which are far stronger and even more chemically resistant. We are still working on dialling in the print settings for these filaments before we produce any models for the public.

 

[standswithabeer]

a great idea!

are the stacks slightly pliable, such that the ID compresses a bit when clamped onto the carb inlet? i see a market for these in pairs, if the centerline distances are identical between different carb racks. i suppose you have considered, but discarded the idea of single v-stacks?

 

[Guest]

Thank you!

They have some flexibility, yes. The flexibility of the part can be entirely altered based on the infill geometry, infill percentage and wall thickness. When clamped on, the fit is so strong that you could pull the entire carb rack out by the velocity stacks themselves; I was really impressed in that regard.

Yes I feel we can offer them to the market far cheaper and with a broader range of customizability than machined variants you would find on ebay or otherwise.

We did contemplate doing single V-stacks, and we are likely to design a pair like that. The purpose of this first prototype was to ensure the material would withstand operating temperates and it did so without any issues. With that confirmed, we are even more motivated to innovate within this space.

 

[scratch]

If material is fuel resistant there would be a market for intake boots that would take different carbs... long ago lost count how many posts I have seen where folks have asked about putting VM carbs on bikes that came with CV carbs.

Eitherway... cool on you for your efforts so far!

 

[Guest]

If material is fuel resistant there would be a market for intake boots that would take different carbs... long ago lost count how many posts I have seen where folks have asked about putting VM carbs on bikes that came with CV carbs.

Eitherway... cool on you for your efforts so far!

And the other way around.

 

[Guest]

All solid ideas! Definitely within the realm of possibilities

 

[Dogma]

Nice looking finish on those prints. Are they sanded, or just a low layer height?

 

[Guest]

Nice looking finish on those prints. Are they sanded, or just a low layer height?

Thanks! The parts shown in the pictures were printed with a 0.6 mm nozzle @ 0.3mm layer height, which is what I would consider to be more of draft quality. We media blast our parts afterwards which gives them a fantastic finish.

Here is an example of radiator drain bolt we made for a Honda CX500

 

[limeex2]

What specs do you need to create these?

 

[Guest]

What specs do you need to create these?

At the very least we would need to know the outer diameter of the carb inlet as well as the center to center spacing between two carbs. From there, the profile of the stack itself is easy depending on the amount of space available.

Any VM/CV carb will be relatively straight forward.

We are currently making an intake for an S&S Super E, which has far different geometry than VM carbs. Luckily, I was able to find a CAD file online of the entire carb and I pulled the mounting dimensions for the intake flange off of that.

 

[80GS850GBob]

How about a 4-1 plate that'll take an oval uni foam filter?...quad carb mount base, inner stiffening structure and a cap to hold the filter in place....

 

[Guest]

Yup that is exactly what we are looking to design and produce! Should make taking the carbs on and off much easier for owners with CV carbs or people that do not like to run pods.