Suggestions for Velocity Stacks?

Jordo!

I thought of looking for some speaker components -- by any wild chance do you know where I could track some down with an ID of 2.25" (57.15 - say 58 mm max)?

They my even have mounting tabs...

I have had some luck carb stacks that might fit... but they are pricey. I want to do this on the cheap since the odds are moderately high that it won't fit and I'll just be stuck with them.

Would an autozone or pep boys carry carb stacks? I guess I could look around for an old school speed shop...

As to having ones machined -- anybody on here up for the project? If so, PM me!

If it works out, we could have a little cottage industry on our hands

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black_sedan

Hmmmm.... Speaker ports?

Speaker Port Tubes in the Speaker Components Department at Parts Express | 320

Jordo!

Very promising -- and cheap, which is always good for a project like this.

Looking them over now -- thanks!

Open to any and all other suggestions by other folks as well!

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Juan@Fontana

i don't know if this is of much help but Specialty Z and I have been using these Velocity stacks on 300ZX and Evo X for a while with huge success

MAF Delete Venturi - 300ZX

Jordo!

Thanks -- but I think those are probably the same size as these one's made by Blox that I picked up -- too big to fit inside the airbox

I really need something flanged that would mount to a TB or carburetor with an ID between 57.15 and 58 mm, similar to the one's in the Rev-up airboxes for the 350 motors in the first post...

Any idea where they might have been sourced?

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SouthArk370Z

I found two but I think they are too big for what you are doing.
Your Search Results - JCWhitney

Stacks were pretty popular back in The Good Old Days and you might find what you need on sites that cater to that crowd. I've seen stacks on motorcycles - might try some of the custom parts stores.

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AzSpeng

Give me a length, the outside diameter of the largest part and outside diameter of the smaller part and ill draw something in cad and make a "prototype"

Jordo!

Awesome -- thanks!

Well, I'm not 100% sure on how to make the flange perfect, but something with at least three mounting locations would probably be good.

The inside diameter should be 2.25" and there appears to be enough room for a 3" bellmouth, ideally elliptical, with a rolled edge.

Length... I think we want to keep it close to the inlet -- too long might interfere with savaging from behind the stack, so, maybe 1.5" or 2" at the most in length?

Hell, if you are really serious and we can work something out to compensate your for your time, I'll just mail you the halved airboxes to work on.

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Zteve

what about sourcing a couple from a 2006 350z intake box?



that is a straight on shot but it is a venturi ring, they changed that from the earlier versions to improve air flow. should be the size you are looking for also

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2013 Midnight Blue 370Z Base w/Sport Package

AzSpeng

Give me a few hours to get things rolling in the shop and ill draw it up in cad.

Juan@Fontana

I'll talk to our machine shop who manufactures the other ones for SZ, he does all kinds of aero space and might be able to draft something up for yah.

-Juan

AzSpeng

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black_sedan

Nice work.

SouthArk370Z

Shirley there is a page out there with the formula(s) you need to design/select this thing right. I found several pages with formulas for the length of a stack connected directly to the carb (primarily motorcycle use) but didn't dig very deep. See if you can find a page by someone who has already done the research and see what the optimum dimensions for the "bell flare" radius and the overall width are. The best "bell width"-to-throat ratio would be a big help.

From what little I've read while doing the above searches, best case is a 1-2% gain and that's starting with a "square" opening (radius of the flare is 0). If the boxes you are using already have some "contouring" your gains will be even less. But that's just what I read on the internet - all my experience with flow dynamics is related to flow measurement.

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Jordo!

Looking inside, there's definitely room for improvement -- it might also be worth modifying the entrance to the airbox itself, but the intake inlet seemed like a good starting point. Check out the link below with projections on gains to airflow based on various lengths of stack vs bellmouth design.


Excellent! Let's work something out to make these things happen -- PM me?


Here's some info on ideal dimensions -- I think anything from the 7 - 11 range should be ideal (and maybe #11 would be best/easiest?).

http://www.classiczcars.com/forums/a...pipeshapes.jpg

Curious, but if we can work this out, and decent power is netted, would people be interested in sending us airboxes to modify to defray costs?

If nothing else, AzSpeng, let's you and I work something out so we can develop a prototype and test the design -- I think this could be really promising, and a nice relatively inexpensive alternative to other aftermarket intakes, but even as a 1 or 2 off project, it certainly shouldn't hurt power!



I'd be down for sourcing those venturi's but haven't be able to find them. I can't even find the airboxes on the cheap -- they still go for over a hundred bucks a pop -- x2 + dyno time makes for a pretty pricey experiment, especially since they may or may not fit...

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