1/26/2024 0 Comments Velocity stack vs air cleanerThis is what I find interesting about the oem air box air supply tube #4 - it is basically a extended concentric reducer. K&N 6" at 60$ with a vstack: Universal Clamp-On Air Filter Green at 65$ plus a v stack: Green Filter - Part #7214 Spectre at 26$ plus a v stack: HPR0892 Spectre Conical Filter K-Tuned at 80$: -K-Tuned Velocity Stack Combo Are the pricier filters really better? When I look at my K&N filter I feel like these filters shouldn't cost so much. I'm still going to pay shipping and import duties so Spectre and Blox are the best priced and I'm very tempted. The v stack won't be open in the engine bay, it will be part of a custom box with a cold air feed. Hopefully a year from now I'll source a RBC, header and larger exhaust. But if there's good reason to go larger on my setup I will! My teg is standard with the exception of the intake and a 60mm Kakimoto Regu 06R exhaust. I'm looking at 3", not larger because that's the pipe I have and I'm afraid of losing mid range. But I'm trying to establish some basics.I currently have a large K&N cone filter with 3" flange and aluminum tube but these filters don't have have a proper bellmouth shape built in, just a basic curve so my plan for now is just to make this more efficient. I realize that I'm over simplifying this and there is friction and other variables to flow that are involved here. An example using round numbers is if your engine sucks a max of 10 cu feet of air per second, if you put a filter on that was say 5 or 10 micron and could flow for the same pressure and temperature 30 cu ft of air per second, you could potentiall have the filter 2/3 plugged and your engine would see no reduction in power. This will give you the best filtration and largest air flow capability while providing long filter life. So, if you had no limits, you would want to install the biggest filter practical on your engine with the smallest pores. And the K&N claim that their filter becomes more efficient at removing dirt as you use it is because it is plugging up with dirt which makes the pores smaller and hence stops smaller particles. They use a tortuous route thru oiled gauze, but when all is said and done, they will pass larger dirt particles. If you take a paper element of a given demension and flow area and replace it with the same size element and it provides more flow, it means that they have either figured out a way to put more holes of the same size on the same surface area (nano technology has achieved this) or you are just putting larger holes on the same surface area. I know I'm about to open Pandora's box and start the thread down a K&N filter argument, but this is why I don't like K&N filters and why I think that they are more snake oil than anything else. And even if you did it, you would have such a small surface area of pores that it would not be long before it would be plugged with dirt. So, going back to the idea of stuffing a filter into a velocity stack, in doing so you greatly reduce the flow capability of the stack. The more surface area we have, the more micron size holes (pores) we have which means we can plug more of them with dirt and still have sufficient flow into the carb. So what does this mean? It means we need lots of holes which means we need more surface area. And we know there is no shortage of dust on our roads. Microns is how they measure dust particles. Now, take that 1 inch hole and reduce it to microns. This will work until too many holes are plugged with marbles and the engine starves for air. We've increased the surface area of the perforated plate to give us more holes. So maybe the solution is more of a long tube that will fit on the carb with a series of 1 inch holes. But what happens when marble gets lodged in one of the holes? It reduces flow, right. How would you keep those marbles out and maintain the flow? Maybe make the plate more of a dome and put several 1 inch holes in it. That plate with a 1 inch hole is a filter. But what does that do, it restricts the flow due to the smaller opening. So, if we wanted to make sure that anything bigger than any thing bigger than a 1 inch marble could not get sucket into the filter, we could put a plate over the bellmouth with a hole 1 inch in diameter. And it changes with RPM due to velocity but lets not complicate it and keep it stead state for discussion purposes. So the volume of air you are trying to achieve is that volume of air. Best way is with an open inlet and a velocity stack. What you need to keep in mind when it comes to filtration is you are trying to provide sufficient air flow to fully fill the combusion chamber.
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