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Miata Hardtop - Points?


LuckyKid
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I believe this is still in the rule book, specifically addressing this.  You can put a top on the car, as long as it matches the factory dimensions it can be handmade at no points. 

 

We built ours instead of spending $$$ on a factory hard top.

 

Now, if you go fastback or something with aero components, then you get to take points.

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1 hour ago, hotchkis23 said:

I believe this is still in the rule book, specifically addressing this.  You can put a top on the car, as long as it matches the factory dimensions it can be handmade at no points. 

 

We built ours instead of spending $$$ on a factory hard top.

 

Now, if you go fastback or something with aero components, then you get to take points.

Ha,  you left out that we built ours because our cage doesn’t fit in a factory top either.  

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We will be in our first Champ race in February and have yet to go through tech inspection.  Our miata has an aftermarket fiberglass top with a plexiglass rear window.  It appears to be more or less the same dimensions as a factory hardtop.  Do I have to claim points for this?  If so, how many?

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16 minutes ago, DEE DEE said:

In his post he said he had plexiglass for rear glass.

 

Oh  I see what you were saying, but the prohibition on acrylic (Plexiglas) and the requirement for polycarbonate (Lexan) is only for the front windscreen not side and rear windows. I seriously doubt that that rear window is made from acrylic anyway and much more likely to made from some form of polycarbonate. Lots of people interchange the names without differentiating between them.

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1 minute ago, mhr650 said:

Good point, it would basically be impossible.

Acrylic is harder.  A rockwell test would be sufficient:

 

Acrylic / Plexiglas Extruded 

Impact Strength 0.4 ft lbs / in
Hardness Rockwell M: 93

Polycarbonate / Lexan

Impact Strength 12 ft lbs / in
Hardness Rockwell R: 118

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