NHRA Disqualifies Two Competitors during the Chevrolet Perfo
 

NHRA Disqualifies Two Competitors during the Chevrolet Performance U.S. Nationals.


#1 - supercharger pulley did not meet specs.

#2 - false battery installed.

Re: NHRA Disqualifies Two Competitors during the Chevrolet P
 

I spoke to the gentlemen with the false battery. It was a borrowed ride and he
was unaware. He wanted to fix it but NHRA wouldn't let him.

Re: NHRA Disqualifies Two Competitors during the Chevrolet P
 

I had a fake battery in tech a couple years ago they found and we didn't even know it was a fake battery...Bo actually argued with the tech guy about it until we unscrewed it and lifted it up. There were quite a few of us that had them and it was more annoying than anything. I don't understand why they care so much about that. It is still stock appearing. I can't believe they would throw someone out for that.

Re: NHRA Disqualifies Two Competitors during the Chevrolet P
 

I have it from a good source that the supercharger pulley was larger than the specification.

There is no plus or minus tolerance on the pulley spec's. unlike crank stroke.

The rule needs to be clarified before a competitor gets pitched. Not a good call by the NHRA.

See you at the races,
Wayne Kerr

Re: NHRA Disqualifies Two Competitors during the Chevrolet P
 

I was told the pulley was smaller, by another supercharged CJ racer, and that he should have had another 120 lbs in the car to run that pulley.

Re: NHRA Disqualifies Two Competitors during the Chevrolet P
 

NHRA had busted a few on this earlier this year and even put a reminder on NHRARacer. So with all those warnings it was probably pretty cut and dry as far as they were concerned.

Re: NHRA Disqualifies Two Competitors during the Chevrolet P
 

I believe the pulley was too large and there is a spec on the pulley diameter.

Re: NHRA Disqualifies Two Competitors during the Chevrolet P
 

Classracerinfo.com shows a spec of 3.5" upper and 8" lower on the pulleys for the 2013 CJ (2014 won't load). If you are using OEM pulleys and wanted to argue that the OEM manufacturing tolerances are unknown, how much deviation from the posted specs should you be allowed? Up to 1%? 5%? 10%? At what point does it become an unfair advantage?

Does anyone know how far off spec the pulley actually was?

Re: NHRA Disqualifies Two Competitors during the Chevrolet P
 

Tech inspectors discovered the supercharger pulley did not meet NHRA specifications.

That all it says Mike.

Re: NHRA Disqualifies Two Competitors during the Chevrolet P
 

Your good source should have told you that the pulley was from a different year Ford supercharger. Thousandths of an inch had nothing to do with the DQ. Using a different OEM Ford pulley from another year is what got the racer tossed.

Re: NHRA Disqualifies Two Competitors during the Chevrolet P
 

With all the underrated hp thats out there, you still have to cheat. If that is the way , then stay the hell home

Re: NHRA Disqualifies Two Competitors during the Chevrolet P
 

The pulley was larger so it actually made less boost but was not the correct size for that year. I'm sure he will have it next time and be faster.

Re: NHRA Disqualifies Two Competitors during the Chevrolet P
 

Several different pulleys, blower sizes for different year models. Surprising the tech guys can keep up with it all.

Re: NHRA Disqualifies Two Competitors during the Chevrolet P
 

Received this today:
I was reading the DQ at Indy thread. There is a little misinformation. Rodgers was running too large a pulley which in fact gives those motors more HP at high RPM according to Jimmy Ronzello who works for Ford on the Cobra Jets. The CJs turn such high RPM that the belt doesn't slip on the larger pulley at high RPM and ends up producing more boost than the smaller pulley. That is why they have a 120 lb weight penalty.

Re: NHRA Disqualifies Two Competitors during the Chevrolet P
 

These comments are better suited for comedy central..

sorry ED..

Re: NHRA Disqualifies Two Competitors during the Chevrolet P
 

When he told me that, I remembered customers trying to make more boost on their street cars with Prochargers and Magnachargers. Higher load, and less belt wrap on the blower pulley did cause high RPM slip. You would know more about the Fords than I, that is for sure.