smoke Posted April 1, 2014 Report Share Posted April 1, 2014 If you want to actually gain some power from a stack (which will be very little in reality) you're going to want a round, smooth edge (pictured). This is due to the air coming in the top from all the way around the stack. A way to picture what that edge does would be to imagine wind blowing across the top of it, like you held it out a car window, holding it straight up and down. The wind coming at it from the side will slide over the round edge and opposed to being whipped up by a sharp one. The air being pulled from the sides will "trip" on that edge more than it would on one like this. Quote Link to comment
hogboy5two Posted April 23, 2014 Report Share Posted April 23, 2014 Some years back a friend built a flow bench for porting heads and showed that shape "11" inside an ordinary flat air cleaner worked as well as any other improvement. As a side note I do not know the password of my former "hogboy52" account and have not been able to access my 2008 e-mail "rca****y@hotmail.com" for years. Quote Link to comment
loungin112 Posted April 29, 2014 Report Share Posted April 29, 2014 Velocity stacks look so nice....but I'm not willing to drive without an air filter. Happy medium somewhere? Also....it seems the concept of velocity stacks and throttle body spacers are the same.....just different location. True? Quote Link to comment
smoke Posted April 29, 2014 Report Share Posted April 29, 2014 Different effect. You can run stacks under an air filter. Quote Link to comment
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