Home-made velocity stacks!


JohnTurbo

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Joined
Oct 3, 2013
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Am I the only one mad enough to design and 3d print my own velocity stacks?

Sorry for tiny photos...thats the shitness of apple products not allowing me to copy image location.

The white one is a 3" to 6" spherical - Mark1.
My car made 220bhp with this on.

Blue is an eliptical design that is as close to the perfect profile as is possible with a 3" to 6" constraint. Ideally you need about 7" to feed the 3" outlet without separation of the flow.

I will try this one next time. i have a dyno run.

Both are 3D printed on an Upbox and modelled by me. I am using a forge 6" filter which is why there is no outer radius - you would need this without a filter at all.
 
Looking good John, we had a 3D printer in tech they are some piece of kit!

It will be interesting to see if the 2nd design makes any difference over the 1st
 
Very cool never thought of using a 3D printer to make car parts! be interesting if tweeking the design can get any more gains, and also be interesting to see what other parts could be made!
 
Wow great idea! Good way of making parts. How long did it take to print?
 
About 7 hours. I have stl files if anybody wanted them.

Interestingly i tried the blue one with and without filter...about 1 hp difference only.
 
I'd like them if possible? :) Really cool project. Have you got before and after dyno's?
 
Dyno results were inconclusive. Power peak was similar but I had changed the fuel pump and significant changes (retarding) to my cam timings to match manufacturer figures. Much more torque across the whole mid range was found...but probably more due to the timings.

If anyone wants CAD files just IM an email address.
 
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