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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 06-27-2004, 03:12 AM   #1 (permalink)
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I think I figure out why there is no significant gains when you get a CAI (short or long) unlike other cars. IF you take your air box out and look into that tube that connects to the carbeurator, there's another pipe enclose withing that pipie. You know, a pipe within a pipe. Now, this pipe is like 1.5-1.75 inches in diameter as compare to the stock 2.5 inch. Could this be the problem as to why having more air doesn't really do much? I don't know myself but its just a thought. Anyone else knows what I'm talking about or agrees with me?
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Old 06-27-2004, 11:50 AM   #2 (permalink)
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I'm pretty sure it doesnt exactly matter about how much air it is.... its all about TEMPERATURE..... hense the cold air intake in the name.... just an observation....

If you really want to get into it.....

As a pipe... or intake narrows towards the end... from big pipe to small pipe... the speed of the air increases.... so I can understand why they did that... The temperature of the air will remain constant.. from beginning to end...

Due to Bernoulli's law as the air goes through a convergent duct or pipe... the speed of the air increases but the pressure drops... as for the intake... the pressure drops at the beginning of the manifold... and depending on the designe of the intake manifold... the pressure of the air either increases or decreases before it is sent to the combustion chamber.

Hope this helps...
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Old 06-27-2004, 01:50 PM   #3 (permalink)
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I totally understand what you're saying but this pipe is ridicuously small. Just take a look yourself. I'm curious though, fo the newer BMW have this type of setup?
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Old 06-27-2004, 01:51 PM   #4 (permalink)
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They probably do.... stuff that is enginered for a reason usually doesnt change from model to model.... but you should ask them any ways.
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Old 06-27-2004, 05:31 PM   #5 (permalink)
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Im sorry, but I'd learn a tad bit more about what "thingies" in the engine are what. I assume you mean either the trottle or intake manifold when you said carbuerator.
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Old 06-27-2004, 05:53 PM   #6 (permalink)
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Are you talking about the sensor within the air flow metter? Because there is no other tube withina tube. and that is only for a little bit.

Kevin

P.S. Bernoulli's Principle I believe, the reason aiplanes fly. Aren't you talking about the Venturi Effect . And no, I don't have anything better to do...
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Old 06-27-2004, 06:16 PM   #7 (permalink)
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Hey Kevin... the venturi effect.... Is another name for Bernoulli's law..... When either a liquid or gas is induced into a convergent duct it will increase in the velocity and have a corresponding decrease in pressure.\


Oh and yes... you were right about why airplanes fly... its because there is slower air under the wing and faster air going above the wing.. which means... more pressure pushing up.. and less pressure pushing down... which makes planes go up...
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Old 06-27-2004, 06:28 PM   #8 (permalink)
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Werd, nice to have somebody that knows what they're talking about and isn't about 20" dubs

Kevin
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Old 06-27-2004, 06:30 PM   #9 (permalink)
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I fly on airplanes for a living.... good subject for me...
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