Suggestions for Velocity Stacks?

AzSpeng · 05-16-2014, 11:41 AM

asdasd.jpg

black_sedan · 05-16-2014, 12:27 PM

Quote:

Originally Posted by AzSpeng

Attachment 88621

Nice work.

Jordo! · 05-16-2014, 05:01 PM

Quote:

Originally Posted by 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.

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.

Quote:

Originally Posted by AzSpeng

Attachment 88621

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!

Quote:

Originally Posted by 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

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...

05-16-2014, 11:41 AM	#1 (permalink)
AzSpeng Enthusiast Member Join Date: Nov 2013 Location: Chandler, Az Posts: 345 Drives: Skyline GTR Rep Power: 11	asdasd.jpg black_sedan likes this.

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