No Mine Shaft for 2025!
 

The SRAC tried to bring back mine shaft rule this year, NHRA rules committee denied the request!! So let me understand this, no mineshaft rule at 100ft and all runs count, but at +4200ft at Indy the runs do not count towards the AHFS? �������� unbelievable! Can anyone explain the logic here?

Re: No Mine Shaft for 2025!
 

There was a rumor that the AHFS would be not be used for all class eliminations but I'm guessing not.

Re: No Mine Shaft for 2025!
 

So Indy is the only place us southern boys can say “Hay y’all watch this!”

Re: No Mine Shaft for 2025!
 

I hate the AHFS. I personally think that Stk/SS is a performance class and should be treated as such. ie; qualified field, lane choice to the lower qualifier, routine tear downs, etc. However, I realize NHRA has chosen not to go in that direction. NHRA has chosen the AHFS as a means to police the class. With that being the case, I don’t see the logic in waiving the AHFS at certain events. The system simply will not work as designed under these circumstances.

Re: No Mine Shaft for 2025!
 

I did not see the No Mineshaft on the NHRA website.

Did I miss it somewhere?.

Re: No Mine Shaft for 2025!
 

The mineshaft rule actually works against you if you make a fast run. It takes away all of the runs for the weekend that could be used to lower the average. Not just the fast run.

Re: No Mine Shaft for 2025!
 

This is especially bad at the end of the year.

Re: No Mine Shaft for 2025!
 

I think every new rule idea submitted was shot down by the rules committee. Some that I heard that got submitted for Stock were allowing addition valve reliefs to solve the piston ding problem, and allowing pistons to be made with the smaller size ring lands so racers would not have to use spacers. Both got shot down. I'm sure there were more. The poll that was taken to see if racers wanted the indexes lowered had a very low percentage of eligible racers voting, and it was shot down.

Re: No Mine Shaft for 2025!
 

What's the piston ding problem?

Re: No Mine Shaft for 2025!
 

wtf is the point of AHFS if it isn't employed at races where guys actually have to run their ***** wide open?

Re: No Mine Shaft for 2025!
 

.........................

Re: No Mine Shaft for 2025!
 

The idea of mineshaft is that the weather is stupid fast for everybody
Including you slow poke
When you have more than 50% of the field going 85 under that means it?s freaking fast out there

Mineshaft is more helpful than harmful

Re: No Mine Shaft for 2025!
 

hey hey hey, no name calling lol

Anyway, fair. I can see the importance and necessity of a mineshaft rule. Maybe more generally, when the mineshaft rule isn't/wouldn't be in play, why do we not have AHFS at all of those races too? Like Indy, National opens, etc? Also, what defines mineshaft air and who makes the decision on when the air is too good?

Re: No Mine Shaft for 2025!
 

Read post 12.
When more than 50% of the field goes more than 85 under.
It used to go to the mineshaft rule.

Re: No Mine Shaft for 2025!
 

By that definition Indy 2024 was a mineshaft. More than half the Stock field was over a second under.
The relationship between AHFS and indexes is out of whack

Re: No Mine Shaft for 2025!
 

As you are not allowed to notch pistons for valve clearance, NHRA saw fit to make it illegal to allow your valves to do the job.

Re: No Mine Shaft for 2025!
 

Exactly, which is why I asked the clarifying question. If there are that many people with the ability to go 1.0+ under in terrible air, maybe we don't have a mineshaft rule until AHFS has a chance to catch up and get some combos in line.

Re: No Mine Shaft for 2025!
 

Sounds good. But, in reality, having the mineshaft rule in place allows less runs to fix your average. Without the mineshaft rule you can fix that 1.00 run on a good weekend. Ask me how I know....

Re: No Mine Shaft for 2025!
 

So slow your average at ?slow? races! Mineshaft rules are for extremely fast weather conditions that don?t occur often.

Re: No Mine Shaft for 2025!
 

Like Indy?

Re: No Mine Shaft for 2025!
 

Indy just shows you how much everyone holds their stuff back all year long. The US Nationals does not have mineshaft conditions but everyone runs all out to win class.

Re: No Mine Shaft for 2025!
 

Some would argue that indicates everyone above the line needs an AHFS horsepower hit.
Others would argue this indicates indexes haven't kept pace with performance improvements since the last adjustment (2009?).
My guess is most would agree it indicates one of holes in the AHFS system, which is that it is easily manipulated and not likely to be effective or equitable for that reason alone.

Re: No Mine Shaft for 2025!
 

It's a tough situation. I honestly don't know what the fair answer is.

We work hard to protect our combinations. The 376 has already triggered one qualifying session in. Now Bragg has a heads-up first round. Foley went faster than we guessed he would too. So, now we have to work on our average or get HP.

Until last year, I had no clue that the low HP 396's could go so fast. How about that 350/255!