"Airflow and How it Makes Ponies" Theory, Someone help me out. Options

[FortuneCookie]

Alright guys. I've been looking into intake induction for a while now. I've probably changed out my intake design probably 5 times already just to try to get better gains. I was thinking about getting cold-air intake next since I have a short-ram intake. BUT, as I was thinking, something hit me and it got me questioning really good. As people keep talking about intake, they talk about airflow and how it gives more horsepower by more airflow into the chamber. And ofcourse, more air means more fuel needed. But something else hit me hard. I've changed my intake system a couple times already and all of them felt different in responce. Not majorly but you can tell (it's ur car, you would know). Intake isn't about how much air is going in. Now that I think of it, it's about vacuum! It's not air getting pushed in, it's air getting pulled in. So I questioned to myself, how do I increase the vacuum velocity so that I can get some better gain than what I have now. Well I did some quick research. Apparently, it's all physics. Something that I'm not good at. But my uncle majored in Quantum Physics in college. So I asked him, "Hey, do you know anything about vacuum and velocity for airflow?" And he said, "Yeah. What for?" I said, "I'm trying to figure out how to make air sucked in faster into the my engine without having to spend a big butchet." And he said, "The smaller the pipe, the more vacuum you'll create." And I paused. I said to myself, wait a minute, most of the time, bigger is better when it comes to cars. Like for instance, the bigger the tubing, the more space it would have to channel air to be vacuumed. But it would not create faster vacuum or would it? Not sure but I decided to do more research. And it turns out, that constriction (snake swirl) type tubing actually helps vacuum velocity increase. Not only that but if you have a constriction figure at the both ends or in the middle of a tube, velocity speed increases and also less pressure. I'm stealing these methods from G. B. Venturi who died 1822 as a Italian physicist. http://biyografi.info/kelime/venturi So I figured, how come no ones ever really thought about this? This would actually evolutionize intake tubing design. What do you guys think? Am I onto something?

This post has been edited by FortuneCookie: Aug 15, 2007 - 10:35 AM

[bindertch]

Everything depends on your head design and your intake and exhaust runners. If you have long small intake manifold runners and small ports in the head, intake and exhaust and a long small tube header then you will have low end torque but no high end power because the engine runs out of air volume because of the small ports and tubes. If you have a short large intake tubes (ITB's and velocity stacks) and large ports (port and polish anyone?) and short large tube header (zoomies?) then you will have high end power but no low end torque (this is because there is no velocity in the air but volume). Toyota designed these engines to have a close happy medium with fuel efficiency thrown in. So just changing your intake and filter will only help remove restriction and gain you more top end (volume). If you want to gain more then port and polish your head, I recommend a professional for this, and change your intake manifold and exhaust header. If you want more low end torque then change your head for one with a smaller ports (not feasible for most engines) and change your intake and exhaust manifold to match. As stated before some engines were set up to adjust the intake runner to partially gain low end or high end but not much. As some people do they make a hybrid 7AGE with the 4AGE head because of the difference in design, but some of the heads were designed for volume/flow (large port) and some were designed for torque (small port).