Re: roller rockers
 

I thought the rule was and is “Any rocker arm permitted.” ?

Re: roller rockers
 

Even then it could be different the next time you go through tech.

Re: roller rockers
 

Until it is fully clarified and there is some sort of a list I would wait to make a purchase. The rule as it is, is too vague. Jim


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Re: roller rockers
 

I talked to Tim Cole yesterday and the understanding is stock configeration, stock ratio. there will no shaft style rockers for BB/SB. Ford, Chyrsler, AMC if they came with shfts you can run the shaft system.

Dirk Olson
5036 B/S

Re: roller rockers
 

This is pretty much what I posted it would be a while ago, however, IT"S NOT IN WRITING YET! which makes it open to each individual tech guy's interpretation. Just a warning. You can bet there will be an accepted list. It's not like roller rockers are going to give you 20 horsepower so don't be to quick to run out and buy them. Be safe rather than sorry (and poorer). Jim

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Re: roller rockers
 

Their must be a goal when NHRA change the rules,,, and i think that the goal must be like this:
Better easier and less money for the racer.
Easier for the tech to do inspections (= less money for NHRA)

This goals should alwayes be their , and be the main thing when the change a rule. And in that case the could always explain to us race WHY.

So is this goal heir with the rocker arms rule ?

The racers : Easier to find ? Less Money ? Better stronger ?

The tech : Check ONLEY valve lift as per the rule book with Zero lash.,, thats it = Easier.
Stock style rockers ,, Studs for the studs like Chevy and shaft for the shaft , like Mopar, use what ever ration we whant, but it must be Stock valvelift.

So for fun,,, look at this rocker arms rule from this GOALS ,,, and see what we came up to.
In my world then i think this is a GOOD rule change !!

Peter PPM Racing

Re: roller rockers
 

I asked three questions to the NHRA tech depart in California a week of so ago.
Are roller rockers allowed = YES
What ratio = THE RATIO ON THE/YOUR BLUE PRINT SPEC
Are aluminum rockers allowed = YES
These questions were,of course,for stock elim.

Re: roller rockers
 

Consider this guys; the ratio on most aftermarkets is stamped on them, and if it doesn't match the specs, it probably won't pass even if the cam passes. And it don't seem so complicated to me; if you got shaft rockers like mopar, don't change the shafts, just the rockers: Studs, keep the configuration, don't machine the head for small shafts etc, And if your unmarked rockers are 1.6 and the spec calls for 1.5, don't be surprised if you need to replace your cam for the 1.5. Basic math (I think). I don't see nothing sinister here. However I'm sure someone will show me the error of my ways; but I'm used to it cause I been married 46 years.

Re: roller rockers
 

My understanding is that NHRA is building jigs to check ratios.

Dirk

Re: roller rockers
 

Somehow I doubt that. They'd need one jig for each engine produced and legal for Stock Eliminator. They'd need at least 7 copies of each jig, one for each division. That's at a bare minimum.

An accepted rocker list is much more likely. Especially since a jig that fits one brand of 1.5:1 rocker arm for a small block Chevy may or may not fit another brand. And that is just one engine of dozens.

Re: roller rockers
 

No need for complicated stuff.

This will be one of the easier checks for tech to do in teardown. Just check the lift at the retainer, then at the lifter. Then divide the numbers.

Re: roller rockers
 

I would have rather had roller lifters to match my cam. Maybe next Christmas.

Re: roller rockers
 

When it comes to STOCK ELIMINATOR,the saying "Christmas comes sooner than you think" might just be the case!

Re: roller rockers
 

Just remember, the change to roller lifters will modify the harmonics in your engine due to the knife edged crank which will alter your NOS settings.

A consideration.

Re: roller rockers
 

Darnit Kyle, you know if I had NOS I would run it in Super Gas where the DP's and CJ's should be.

Re: roller rockers
 

Super Gas? How would you slow them down that much? :rolleyes:

Re: roller rockers
 

With a keyboard and a mouse, how else!

Re: roller rockers
 

Guess I'm a dumb-*** but why would the exact rocker ratio matter to NHRA tech? The lift at the valve would seem to be the important spec, so measure at the retainer and if it is in spec, it is good. The amount of machining needed to use a significantly different ratio rocker on a particular engine to maintain the geometry and have pushrod clearance is probably illegal anyway.

Anyone who has measured the OEM rockers know the last thing they have is an accurate ratio. Measure 16 of them and your probably going to get 16 different numbers.

It's sort of like the rod/piston/pin issue a while back. The total weight of the assembly is the guide so you can have a little lighter piston with a little heavier pin or rod, etc, as long as the total weight is good, it's OK.