Miata Mailing List: July 1998, Message #125

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On 7/1/98 11:15, EMarksbury@aol.com EMarksbury@aol.com wrote:

>I am also waiting for a NACA duct from Brainstorm which should give me
>an extra 2h.p. considering the air cleaner sits right behind the headlight.
>For those who do not know what a NACA duct is I will explain.  This duct
>replaces your drivers side headlight cover with a new cover that has a 
>half of
>an hour glass shape air duct built into it.  These 2 items combined may 
>cost a
>little more than the JR CAI, but I belive it gives the car a much more racier
>appearence.

No doubt--it does look cool. But don't be too surprised when your 
expected 2 hp doesn't materialize, since air flows *out* of a NACA 
headlight cover on a Miata, not into it. The faster you go, the more air 
flows out. It's in an area of significantly lower pressure than the 
mouth. This has been documented on the list by experiments using tufts of 
yarn to indicate airflow.

---
Lanny Chambers, St. Louis, USA
'94C

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