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Author: Subject: Velocity stacks with stock airbox
Kevin
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smile.gif posted on 12-12-2003 at 12:19
Velocity stacks with stock airbox



I recently received some velocity stacks for my 1980 kz 1000 I do not plan on running them alone since it is my daily rider. I want to modify my air box and have the stacks comming out of the air box to the carbs. Any ideas anyone?
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440G1
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[*] posted on 12-12-2003 at 12:20


Question do your side covers cover the stock airbox?



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kawtoy
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[*] posted on 12-12-2003 at 13:07


I don't think that they will do any good with an airbox.



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clawson
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[*] posted on 12-12-2003 at 14:16


I'm just wondering what the *point* of using velocity stacks with an airbox would be...

cl




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galaxian
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[*] posted on 12-12-2003 at 14:32


Kevin, the point of using velocity stacks is to get more air into your cylinder. By trying to fit them into your airbox you are negating that use. Making them pointless. Why not run them on the street??? If you want better breathing and filtration perhaps looking into K&N is another solution.



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chevroletwizard
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[*] posted on 12-12-2003 at 15:57


use v-stacks with an airbox???? what for? looks? if so just glue them to the outside of the airbox and don't bother cutting any holes in it either. lol. better yet. just glue two to each side cover.



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alienzr
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[*] posted on 13-12-2003 at 01:41


Well there is a point to using them, the carb mouth will still see air coming in at a higher velocity, hence the name velocity stacks. The problem is that you need to move the airbox waaay back for the stacks to work.
A better solution would be to run the stacks without the airbox and use K&N's similar to the old hilborn injector setup.

[Edited on 13-12-2003 by alienzr]




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kiwi-z
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[*] posted on 13-12-2003 at 02:07


I agree with alien it would increase the velocity of the air intake quite a bit
I have seen a CB 750 in australia using an airbox with velo stacks in classic racing
it seemed to do the trick.
I think it might be better than pod from the steady airflow point of view (it does not filter anything though...)
you want to consider cl's window trick for that......
you might want to leave the lid off or make the air intake bigger

or try a combo like this trick Falco airbox...
Mark

[Edited on 13-12-2003 by kiwi-z]

[Edited on 13-12-2003 by kiwi-z]

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SandRacer
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[*] posted on 13-12-2003 at 07:36


I'd have to agree with alienzr and kiwi-z on this one. K&N even offers a similar set up for automotive use but they call it a "sub stack". The idea is not unlike the pic that kiwi-z posted. The sub-stack is used to smooth out the air flow before it enters the carb. I would think that it would work even better if you were to open up the air box to allow more air in. This may not work well if you live or ride in a very wet climate but is a fairly common practice out here in "Dry Heat" country.

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CoreyClough
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[*] posted on 13-12-2003 at 07:45


It's like having long intake runners after the carb, versus short ones. As long as the "stacks" aren't hitting the top of the air cleaner, they should work. Anything to smooth out the flow into the carb.



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TwoCam
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[*] posted on 13-12-2003 at 10:22


Running stacks in a stock air box will do some good. The main purpose of stacks is the straighten out the air flow through the carb body, to reduce turbulance. in doing so the air flow increases.

I would go for it. maybe epoxy them to the inside of the air box. stay away from the quick set epoxy's. I lilke JB Weld myself. Works on most materials.

K&N makes some filters with stacks incorperated into them.
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Mark Wing
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[*] posted on 13-12-2003 at 10:46


Are you sure you need them. On the KZ650 the boots are velocity stack shaped alredy?
Mark

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Kevin
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[*] posted on 13-12-2003 at 13:47


Yes most of this will be under cosmetic and I'm also incorporating chrome airbox covers from a police bike. I wanted to do something trick that actually do something for the performance of my daily rider also. Thanks for the advice guys I'm going for it!
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