Miata Mailing List: January 2000, Message #118

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On 7 Jan 00, at 22:25, Bob Schnider wrote:

> 16 degrees btdc... cone filter adjacent to factory header... homebuilt
> heatshield and headlight duct... knock free in all weather with 89 octane.

Lucky you!  :-)     (I was only running 14 btdc btw)

Most likely my deal was I had no heat shield... nor had the desire 
to fab (or procure?) one.  When I was running an Akimoto (K&N), I 
had to run the highest grade I could get in the summer, and still 
had to ease off with the right foot in stop-n-go traffic (when 
underhood temps soar) - it would take a minute or so of 40mph+ 
driving to "clear out" under the hood of the high temps to where I 
could flex my right ankle with impunity.  I also understand the 
susceptability (sp?) of Miatae to knock varies from car to car.  
Mine could be particularly prone, and yours could not.  Another 
degree of freedom in trying to solve the equation...

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