"Smallbear wants a modern Syclone, local Maple Leafs spammer" (smallbear94) 03/18/2015 at 12:51 • Filed to: None

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Is this a thing?

This is a complete shot in the dark, but...

I want to do a custom (read: homemade mickey-mouse) cold air intake, and I was looking for a pressure diagram to show me where the best place to locate the intake would be. I know I have seen them around, but I don't know if it was just a one-off for somebody else's project, or if it was from a website somewhere that actually did them for different vehicles. Anybody know anything?

Snuze: Needs another Swede > Smallbear wants a modern Syclone, local Maple Leafs spammer 03/18/2015 at 12:58

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What do you mean by a pressure diagram? Have an example?

I deal a lot with pressure drops through HVAC systems, so are you talking about loss coefficients through various fittings and things like that?

Smallbear wants a modern Syclone, local Maple Leafs spammer > Snuze: Needs another Swede 03/18/2015 at 13:13

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Basically I mean that I want to know where exactly the air meets the most resistance. Something like this:

that shows up higher pressure in red. That will tell me that that site is best and will give me a sort of "ram air" effect. Obviously the headlights spring to mind, but I can't mess with them. In theory, I could supply the engine with more air and at the same time reduce drag a little.

However I'll admit that what I know about vehicle aerodynamics you could put in your eye without noticing it...

Smallbear wants a modern Syclone, local Maple Leafs spammer > Snuze: Needs another Swede 03/18/2015 at 13:14

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Image got Kinja'd.

Snuze: Needs another Swede > Smallbear wants a modern Syclone, local Maple Leafs spammer 03/18/2015 at 13:22

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Your picture won't load, but I think I see what you're getting at... Putting an intake in front so you get a ram effect. So the issue with doing that sort of thing is you're going to ingest a lot of crap... dust, bugs, debris, water etc.

Unless you want to cut a hole in the hood or fender and have a snorkel sticking up, you're going to have to route all the piping around the radiator core support, etc. Without knowing any specifics about your car, you are probably going to need a lot of piping and some elbows, etc. These all add pressure losses to the system, which translates into reduced flow. So whatever ram effect you gain may just as likely be negated by these extra bits.

Smallbear wants a modern Syclone, local Maple Leafs spammer > Snuze: Needs another Swede 03/18/2015 at 13:33

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It's a truck so there's lot's of space. The stock airbox is pretty deep, I was thinking of modding it so the air still goes through the stock filter. There are a few likely places on the front, but I wanted the chart to check the best spot before I cut anything...

Anyways, I see what you're saying about not getting much gain—I'm not saying I'm going to give it up, but I'll definitely have to look pretty hard at the routing before I try anything. Thanks anyways for trying to help.

Snuze: Needs another Swede > Smallbear wants a modern Syclone, local Maple Leafs spammer 03/18/2015 at 13:57

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Not a problem always glad to help. And by all means, give it a shot. I wouldn't try to talk you out of it unless it was dangerous or profoundly stupid. Just trying to give you a realistic expectation of results. And a lot of old truck airboxes did suck, so you may actually pick some gains up. But the airboxes on almost all newer cars and trucks are much much better designed. They have to be to meet emissions requirements and such. Also, a lot of cold air intakes, especially the short-ram style, provide artificially high numbers on dynos due to the closed conditions of the cell, real world numbers are usually much lower i.e. about same as stock.

Let me know if you want any advice or help with calculations.