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Velocity Stack Effectiveness?

 
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Old 07-03-2011, 08:41 PM
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Velocity Stack Effectiveness?

My car came with some 3" eBay air intake and I'm not going to go by a stock intake with no noticeable difference. I have heard good things and bad things about these, so I was wondering what the deal is with them.

The type of stack I was looking at was similar to this:

COLD AIR INTAKE VELOCITY STACK 3.0 INCH ALUMINUM TURBO | eBay

The theory behind it seems to hold some water, but it doesn't seem wise to sacrifice all filtration for nominal gains.

Any opinions?
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Old 07-03-2011, 09:17 PM
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Re: Velocity Stack Effectiveness?

K&N makes an air intake filter with a velocity stack as an internal add on. That aluminum is for offroad use only, meaning race day, nothing for you to suck off the track. You could also look up steel mesh filters if you want. I don't know what happened to the laptop you recently purchased, but I do not want to hear any more prelude tragedy this week.
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Old 07-03-2011, 09:59 PM
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Re: Velocity Stack Effectiveness?

I'm trying to picture where it fits. The velocity stacks you see on many race cars are designed to channel air into the throttle body. On our cars, the intake duct already does that. If this fits right in front of the throttle body, it's acting more as a restrictor. Whether the air moves faster through the center or not, you'll only get a certain volume through that opening...and it's smaller than the opening it fits into.
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Old 07-03-2011, 10:20 PM
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Re: Velocity Stack Effectiveness?

Look into a blox velocity stack, they have filters available for them. The piping is in no place smaller than 3in. Preludepower has a review thread on a bpi flowstack it explains the theory behind it very well and has multiple dynos comparing if I recall correctly ( the blox is a copy of the bpi)
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Old 07-03-2011, 10:41 PM
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Re: Velocity Stack Effectiveness?

I just really like the look as well as the theoretical difference it would make. I really wouldn't want to risk my engine or pay a lot for such a small gain regardless.

To SI: I can't believe you remember me buying this thing. I am on it now, my desktop fried. As for Prelude tragedy; My head gasket blew last week. Also discovered my radiator was rotten the other day. Now I'm fixing it right.

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Old 07-04-2011, 12:13 AM
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Re: Velocity Stack Effectiveness?

I already saw the threads. No more madness ok?
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Old 07-04-2011, 01:12 AM
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Re: Velocity Stack Effectiveness?

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Originally Posted by Sideswipe SI View Post
I already saw the threads. No more madness ok?
Define "madness," lol. If by madness, you mean the head gasket carnage, it wasn't my fault in the least bit. It blew when I was cruising at 2500 rpm's. I didn't redline it to death. When we took it apart, one of the intake cam bearings was missing a bolt and the head bolts weren't torqued at all. The center one (longest) was finger tight! The belt snapped on the previous owner and apparently this sorry excuse of work was the result. Regardless, I'm doing it all properly now. I'm hoping this solves many issues. The timing belt is new, but I'm not risking it after seeing the head job. I sent it to my step dad's shop to get ported and polished, but he said Honda did a very good job and it would be nearly pointless. It should be back together this week and ready to tear up the tarmac once again!

I was looking at this stuff for replacement:

http://cgi.ebay.com/ebaymotors/ws/eB...#ht_2059wt_937

http://cgi.ebay.com/ebaymotors/ws/eB...#ht_1869wt_939

http://cgi.ebay.com/ebaymotors/ws/eB...#ht_1316wt_897

I know the head set isn't name brand, but I couldn't find any horror stories about them. Same with OBX. Spectra Premium should be fine.

Any thoughts?
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Old 07-04-2011, 09:12 AM
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Re: Velocity Stack Effectiveness?

Damn, that's crazy. I'm gonna go try that, "how long can I run my hand tightened car?" You can't go wrong with the parts list, most of the time, when shops replace your parts, if it isn't napa/ac delco It's generic anyways.

Just do the 500 mile checkup (I'm due LOL) make sure there's no leaks, squeaks, or rattles, fluid levels, etc,etc. Even hoist it up to check the bottom. Sounds paranoid, but in retrospect. Worth the one Sunday afternoon to save loads of money. Don't forget suspension parts!
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SURGEON GENERAL WARNING:
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Old 07-04-2011, 10:53 AM
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Re: Velocity Stack Effectiveness?

If one of your head bolts was hand tight, you would be loosing quite a bit of compression, your car is going to feel a lot better when it is put together right!
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Old 07-04-2011, 05:33 PM
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Re: Velocity Stack Effectiveness?

The stock intake with the TYPE S mod has 3 velocity stacks.
1: One at the air input
2: One where the air enters the air filter box
3: And on the TYPE S intake a third funnel at the output of the air filter box
Velocity stacks help to channel the air into a tube in an efficient matter which in theory will speed up air flow and improve throttle response and power.

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Old 07-04-2011, 08:20 PM
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Re: Velocity Stack Effectiveness?

^^ Very well said.
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