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Velocity stack intake1/8/2024 ![]() ![]() ![]() This is one of the velocity stacks here from that photo so this is anodised grey but this is an aluminium machined part here so that's one process of making something like this.Īnd the kind of form, geometry, thickness and obviously the length of these changes a lot for different engines but they're all generally the same kind of trumpet shape. So various different processes that we could use to make these, we'll just jump onto the overhead camera. The alternative one, and one of the key benefits of using CAD is the ability to use CAM which is computer aided manufacturing which basically is allowing us from our CAD software or using another CAM software, control CNC machine to make the part and that could be something like a 3D printer or a CNC machine like a 5 axis mill or a lathe or something like that. So why would we want to model our velocity stacks in CAD software? And we might just be doing it for a few different reasons, one of them might be just to have it inside an assembly, say we're trying to design something like this and we want to see how it'll fit and maybe how it would look if we're designing an air box, we might want to check clearance issues so that might be a reason. The length of them, these ones here are very long pieces, depends on the harmonics in the intake runners and there's a lot to do with that about tuning powerbands especially in naturally aspirated engines.īut we'll cover that in a separate thing, today we're focusing on CAD. So that's why we have this kind of runner length and the nice bell shaped mouth on the end to keep that airflow smooth. So velocity stacks, intake trumpets, whatever we want to call them, these parts here bolted to the throttle bodies and then we've got the manifold here so I won't get too deep, I won't get into the reason why we'd have these but it's essentially about keeping that airflow unrestricted on the way in, keeping the flow nice and smooth and laminar at high airflow velocities. This is a WhitleyTune sports injection kit from here in New Zealand for the L24 engine in my 240Z. We'll just jump onto my computer here, I've got an image here of my personal intake setup. So velocity stacks, let's just start with that. ![]() This week we're going to be talking about modelling velocity stacks in OnShape so actually going to give you a demo of modelling velocity stacks or intake trumpets, air horns, whatever you want to call them, inside OnShape which is a free online browser based CAD software. Through the well-revered DMS community, a member mentioned swapping a 4-inch turbo intake with a Velocity stack on one of their customer cars that made 490-wheel horsepower.- Hey team, Connor here from HPA and welcome to this week's webinar. The icing here is that a Velocity stack is not a highly complex engineering solution but a simple one that if done right can lead to a decent power bump at a lower cost. In addition to this, you get induction noises that tingle your aural receptors. ![]() Velocity stacks on the other hand are relatively inexpensive and offer 3% more power while keeping most of the engine characteristics the same. While they do make significant power upgrades, they are still expensive and vastly alter engine characteristics. There are multiple ways to increase horsepower: you can have an ECU flash, have a supercharger bolted, or slap on a turbo. Now if you managed to own a high-revving screamer chances are that you must at some point look to make more power out of it. Therefore, a high-revving engine sucks in more air than a long-stroke unit. The volume of air passing through the engine is directly proportional to the engine speed. ![]()
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