engine and drivetrain Velocity Stacks - should they have filters or not?

[zinz]

Interesting #s, Alan. Now we really fall into the problem of fitment of a 200mm long velocity stack... Even the new stacks from Ireland are "only" 100mm and 130mm-ish.  

 

Here's an interesting tech article on tuned intakes for the M10 and ITBs.  http://77e21.info/mstunedintake.htm  He has a clever solution for making your own airbox as well.

 

Remember kids, short stacks for torque, long stacks for hp.

 

Ed

[jimk]

If anyone wants to know why the stacks work as they do attend the Kahn Academey on youtube:

Then design your own!

Edited October 12, 2015 by jimk

[zinz]

Nice!  Thanks for that Jim.  I'll need to watch that...

 

I seem to remember, one needs to include the entire length of the induction stream (include the length of the carburetor throat and intake manifold runner, in addition to the velocity stack length) when running some of the wave calculations.... though, I'm guessing the throttle plates, choke plates, etc would induce a fair portion of interference.  Most of that is above my pay-grade...

 

Good stuff though...

 

Ed

[vinntagejoe]

^{My system......}

I like those; how much for a set? Where to buy?

[visionaut]

Look up Ram-Air (like Emyers) or Pipercross (like mine) dual-stack DCOE filters. I run 40mm stacks inside 'em for decent free-air clearance in front of the bellmouth. With my longer manifold, I've also cut down the rear one a small bit at an angle to fit better at the booster...

Edited October 13, 2015 by visionaut

[Emyers]

I like those; how much for a set? Where to buy?

Purchased these off Ebay  They are out of the UK.  Come in sizes to fit 40 and 45 DCOE horns.  Do not remember the cost but I thought they were very reasonable.

Earl

[Simeon]

Purchased these off Ebay  They are out of the UK.  Come in sizes to fit 40 and 45 DCOE horns.  Do not remember the cost but I thought they were very reasonable.

Earl

+1. I bought a pair of those foam filters from the same guy for my slowly evolving Solex sidedraft fitment. They fit nicely over the factory horns.