Air "TUBE" Question - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 09-03-2001, 09:26 PM
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Air \"TUBE\" Question


i am adding a cat back to my rig and want to improve air flow a bit

i see people all using these "TUBES" but what is the acutal purpose of the tube?

i have an 89 2.5L with the TBI and the air intake comes in horizontally instead of vertically and look like a nice K&N Filter could easily bolt right to that and would cost much less than those "Air Tubes"

why hasnt anyone done this??

am i missing something? does the tube have a purpose i am missing?


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post #2 of (permalink) Old 09-04-2001, 02:47 PM
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Re: Air \"TUBE\" Question

I imagine someone has done it, however, I believe the "Air Tube" creates laminar flow to more efficiently bring air into the engine. Without the "Air Tube", you get more turbulent flow, resulting in lower volumes of air.

That is my understanding anyway.

Good Luck!

Enjoying Montana's Big Sky
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post #3 of (permalink) Old 09-04-2001, 07:53 PM
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Re: Air \"TUBE\" Question

Be careful when you start messing with exhaust systems on modern engines. Reducing back-pressure has a downside in that it also has a tendency to increase the RPM at which your engine reaches peak torque. This is especially true with small displacement engines.

As for adding flow straightening tubes to the induction system ... well, this is mostly marketing hype. For a flow straightener to begin to work properly its length should be at least 20 time its diameter and the tube should have a system of vanes running lenghtwise in its bore.

Nevada ORU
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