NTPA rule change (didn't see this mentioned) November 13, 2019 01:36AM
I remember discussion about screw blowers, but missed this one-

Per NTPA Tech page showing new rules:

2019 rulebook pg 24, letter G now reads:
"Automotive engine is any engine or its replica available in a passenger car. Maximum of (8) cylinders. Maximum supercharger size: 14-71, 19-inch rotor case length, 11.25-inch rotor case width. Helix restricted to a maximum rotor spiral of 6.5 degrees per inch of rotor length. Variable multi-speed supercharger devices prohibited.”

So, Knapp, Eder, and several others in both light and heavy unlimiteds have expensive 18-71 superchargers that are now expensive doorstops? Screw blowers are legal, though (w/ 125% overdrive).
I don't see anything exempting the unlimited classes from the 14-71 limit.

Could someone clarify?



Edited 2 time(s). Last edit at 11/13/2019 01:37AM by The Original Michael.
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Re: NTPA rule change (didn't see this mentioned) November 18, 2019 02:12AM
I think that applies to all classes that use automotive engines unless the specific class rules say differently. The unlimited class rules override this rule would be my thoghts.
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