NHRA hp updates

[Mike Gray]

Originally Posted by Larry Hill

If you can’t run at least -.650 under at a race it will have zero affect on the average. It will be like you were never at the race according to the AHFS.

Oh, okay I’m catching on to the new AHFS if I run BETWEEN .650 - .850 under they will like me and over .850 under and they will send me hate mail. Do I understand this correctly that my combo in B can affect other cars from AA - C because it’s in the same engine family even though the engine specs may be different, like different heads and valve sizes? I must have skimmed over the paragraph below too quickly.

“1st screening: The average for all vehicles running the particular engine family combination being reviewed is included in this screening. The review process will average runs in ALL classes TOGETHER with the same transmission type & the same body platform.”

[Tom Meyer]

Assuming transmission means auto or manual? I was going to sort out my SS combo with my trusty PG vers a three speed that some say are 15 quicker. But I still could take the hp hit. Now what about wagons, is a chevy II wagon going to be the same platform as a 2dr ht? Is the malibu wagon the same as 2 door car. Tom

[Billy Nees]

Tom, I'm pretty sure that they go by wheelbase. If the hardtop and wagon have the same wheelbase then they're considered the same.

[Alan Roehrich]

Originally Posted by Mike Gray

Oh, okay I’m catching on to the new AHFS if I run BETWEEN .650 - .850 under they will like me and over .850 under and they will send me hate mail. Do I understand this correctly that my combo in B can affect other cars from AA - C because it’s in the same engine family even though the engine specs may be different, like different heads and valve sizes? I must have skimmed over the paragraph below too quickly.

“1st screening: The average for all vehicles running the particular engine family combination being reviewed is included in this screening. The review process will average runs in ALL classes TOGETHER with the same transmission type & the same body platform.”

Your combo cannot affect anything other than that same engine combo. If your combo has different heads, valve sizes, etc, then it doesn't affect combos that don't have the same specs. So, if your combo has 2.07"/1.725" valves and oval port heads, it will not affect a combo with 2.195" and 1.725" valves and rectangle ports.

[Bob Shaw]

That's the way they say it works. For the 4.3 Chevy tbi engines they factor flat tappet cams, roller tappet cams, 108 wheelbase, 117 wheelbase, 430 lift cams, stock lift cams, cars or trucks together. All are considered the same engine family and body style.

[Mike Gray]

Originally Posted by Alan Roehrich

Your combo cannot affect anything other than that same engine combo. If your combo has different heads, valve sizes, etc, then it doesn't affect combos that don't have the same specs. So, if your combo has 2.07"/1.725" valves and oval port heads, it will not affect a combo with 2.195" and 1.725" valves and rectangle ports.

Okay, makes more sense. Why couldn’t they just say running the same engine specs rather than “engine family”.

[Terry Cain]

Originally Posted by Mike Gray

Okay, makes more sense. Why couldn’t they just say running the same engine specs rather than “engine family”.

They wouldn't do that. They paid a law firm to write the wording.

[Mike Gray]

Originally Posted by Terry Cain

They wouldn't do that. They paid a law firm to write the wording.

The FE engine family is confusing enough with all the different variations. There are numerous combinations that could be in the same class. Now I see how this could help with the average for each because hardly any two 428 cars are running the EXACT same combinations.

[Bernhard]

What effect would bringing back the factory valve spring rule have?
Would this not simplify tech and negate some of the advantage found in cylinder head and intake advancement?