Do You Run Velocity Stacks?

straighten fuel mixture, yeap, laminar flow.

Warning I'm a CAD junkie:

I designed my own velocity stacks.

So the theory behind my stacks deals totally with an expansion ratio. Osbourne Reynolds told us how to change the cross sectional area for fluid flow without inducing turbulence. So a proper velocity stack not only straightens the air but also compresses the air. At the correct ratio, you get an incredibly efficient pump which is increasing the flow rate and delivering more oxygen into the cylinder.



I have the carburetor diameter and the length (it needs to fit) as parameters in my design.

I break the design into to 2 pieces:
-the venturi which is compressing the air
-the scavenger which is gathering air at the intake

Both are very subtle and I believe can add to your performance if done properly. The trick is not to produce turbulence.

Here's a link to my 1st run up my poor man's dyno:



In the video I'm shifting into 5th which is a first while climbing this hill. This is totally due to the stacks. I could do a ton up this hill if I were man enough.