Minimum weight in AA/AF and BB/AF for Ecotec engine

[Charles Stewart]

Do you know the reason why the 4 cylinders Ecotec engine is penalized so much, in minimum weight VS all others 4 cylinders?

AA/AF: Minimum weight: GM Ecotec, 2,050 pounds, all others 1,750 pounds.
BB/AF: Minimum weight: GM Ecotec, 2,350 pounds, all others, 2,050 pounds.

[Charles Stewart]

I also see in the turbocharged paragraph that the size is limited at 68 mm for the Ecotec and limited to 74 mm to all others 4 cylinders 4 valves...
This engine get a lot of restrictions for some reasons...

[Nick Heath]

Hi Charles, I don't have an "official" answer but remember that those classes grew out of the old NOPI/NHRA Sport Compact racing series.

From what I understand, the Ecotec engine dominated every class and probably helped kill the series. I imagine NHRA made "parity adjustments" to level the Ecotec with other combinations.

It would be similar to how a FSS/SM Mustang would need a bigger pulley than a COPO or Drag Pak even though it's running in Comp.

[Charles Stewart]

Originally Posted by Nick Heath

Hi Charles, I don't have an "official" answer but remember that those classes grew out of the old NOPI/NHRA Sport Compact racing series.

From what I understand, the Ecotec engine dominated every class and probably helped kill the series. I imagine NHRA made "parity adjustments" to level the Ecotec with other combinations.

It would be similar to how a FSS/SM Mustang would need a bigger pulley than a COPO or Drag Pak even though it's running in Comp.

Hi Sir, I was not aware of such domination in the NOPI/NHRA Sport Compact Series.
I didn't have any kind of interest for that serie at that time.
Thanks, I appreciate your input.
Keep on,

[Charles Stewart]

Originally Posted by Nick Heath

Hi Charles, I don't have an "official" answer but remember that those classes grew out of the old NOPI/NHRA Sport Compact racing series.

From what I understand, the Ecotec engine dominated every class and probably helped kill the series. I imagine NHRA made "parity adjustments" to level the Ecotec with other combinations.

It would be similar to how a FSS/SM Mustang would need a bigger pulley than a COPO or Drag Pak even though it's running in Comp.

Mr. Heath, I just received a confirmation of your previous information from Mr.Pat Cvengros, Pacific Division Technical Director
Thanks again for your support,