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Old 06-15-2024, 10:36 AM   #1
Charles Stewart
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Default Minimum weight in AA/AF and BB/AF for Ecotec engine

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.
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Old 06-18-2024, 01:52 PM   #2
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Default Re: Minimum weight in AA/AF and BB/AF for Ecotec engine

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...
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Old 06-19-2024, 05:30 PM   #3
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Default Re: Minimum weight in AA/AF and BB/AF for Ecotec engine

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.
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Old 06-20-2024, 10:18 AM   #4
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Default Re: Minimum weight in AA/AF and BB/AF for Ecotec engine

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Originally Posted by Nick Heath View Post
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,
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Last edited by Charles Stewart; 06-20-2024 at 10:20 AM.
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Old 06-20-2024, 02:55 PM   #5
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Default Re: Minimum weight in AA/AF and BB/AF for Ecotec engine

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Originally Posted by Nick Heath View Post
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,
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