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Thread: Airflow through corrigated vs non corrugated pipes

  1. #1 Airflow through corrigated vs non corrugated pipes 
    New Member
    Join Date
    Jul 2007
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    4
    Hello,

    I have recently been modifying my cars intake system to get rid of some restrictions in the airbox.

    Now I have been reading certain auto forums and nearly all of them said they have had restriction problems with corrugated or "ribbed" pipes.
    Even a guide on modifying a cars intake suggests swapping from a ribbed pipe to a non ribbed pipe and says it flows better.

    I always though corrugated pipes were better for airflow, why is there certain guides suggesting to switch to a non corrugated pipe.

    Here is the link to the guide :

    http://www.autospeed.com/cms/article.html?&A=0779

    Scroll down to the heading titles "Phase 3" and you see that the corrugated pipe is replaced with a non corrugated one.

    Any thoughts on this?

    Thanks,
    Kidcash.


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  3. #2  
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    For the same crossectional area of a pipe a ribbed one will have a greater surface area in the flow path. A circular pipe offers the maximum cross section with a minimum wall interface.

    Now in simple terms the greater the surface area the greater the friction. THink of throwing a line of corks across a flowing river, the corks in the centre will flow fastest, there is a model for this, imagine if you like two skate boards each very long one on top of the other. THe lower one is riding on the road whilst the second is riding on the first, the second one is going at the combined speed of both. A little simplified but it should illustrate the point,

    If all of the air is close to a surface it will encounter more friction. A ribbed pipe is better for cooling, all pipes are a compromise oh and polish the inside as highly as you can.

    THe subject is fluid mechanics


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  4. #3  
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    Jul 2007
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    Thanks,

    So the ribbed pipes are for cooling rather than for better airflow? As I was always was bought to believe air flows better through a ribbed pipe
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