Lifter rule in Stock

[Alan Nyhus]

Originally Posted by Grey Ghost

Here we go. Why do the hyd cam combos get an "up grade" and not the solid cam combinations?? IF ( I am not advocating for this) everyone had been up graded to rollers would that not have leveled the playing field? Am I missing something here? Are not the lifter concerns "wiping out a motor" shared with solid and hyd cams?

Hi Phil.

In a way, a hydraulic cam switched to solids actually loses lift when checked the NHRA way. Since the NHRA checking clearance is .000 (zero), a solid cam loses the lift from the lash when it's running.

A hydraulic lifter is theoretically always at .000 (zero) when it's running.

[Kenny Wigington]

So in a sense, all the folks using a hyd lifter, as they were supposed to, can change to solid lifter grind, at the same specs, and gain, what maybe 25 to 30 hp ? Is that idea still correct ?


Im only out of class racing, for a little while...

[Coleydog]

Originally Posted by Grey Ghost

Here we go. Why do the hyd cam combos get an "up grade" and not the solid cam combinations?? IF ( I am not advocating for this) everyone had been up graded to rollers would that not have leveled the playing field? Am I missing something here? Are not the lifter concerns "wiping out a motor" shared with solid and hyd cams?

Seems like a lot of concern about someone getting an edge by using solids making them faster. If they run heads up, maybe, other than that it's a bracket race. Take away the heads up, run on your number, problem solved with Daddy WarBucks mega dollar engine getting a free ride.

[Grey Ghost]

Originally Posted by Alan Nyhus

Hi Phil.

In a way, a hydraulic cam switched to solids actually loses lift when checked the NHRA way. Since the NHRA checking clearance is .000 (zero), a solid cam loses the lift from the lash when it's running.

A hydraulic lifter is theoretically always at .000 (zero) when it's running.

Good Morning Al.

I understand that. Why the rule change then? Higher RPM capability?

[Alan Nyhus]

Originally Posted by Grey Ghost

Good Morning Al.

I understand that. Why the rule change then? Higher RPM capability?

One less thing for Tech to check, would be my guess?

[ron mattson]

My guess would be for ease of tech, the performance
Will change very little , not gonna turn a 6500
Rpm engine into a 8500 or gain a bunch of power.
I would think at very best .03-.05 the current generation
Of limited travel "hydraulic" lifters are solids already!
Just my .02$$ lol!!!!

[pfordamx]

Does this mean that Hydrualic rollers can be replaced with Solid Rollers?

[ron mattson]

Not sure in the roller stuff, but that is where
You would see the largest gain not flat tappets.

[Bob Bender]

Originally Posted by ron mattson

My guess would be for ease of tech, the performance
Will change very little , not gonna turn a 6500
Rpm engine into a 8500 or gain a bunch of power.
I would think at very best .03-.05 the current generation
Of limited travel "hydraulic" lifters are solids already!
Just my .02$$ lol!!!!

x2

[Mike Keener]

Originally Posted by Grey Ghost

Here we go. Why do the hyd cam combos get an "up grade" and not the solid cam combinations?? IF ( I am not advocating for this) everyone had been up graded to rollers would that not have leveled the playing field? Am I missing something here? Are not the lifter concerns "wiping out a motor" shared with solid and hyd cams?

Great question!