REALLY, Letter to tech.

[Greg Hill]

I thought the rule book said any corporate rear. I know several people who run aluminum spools.

[X-TECH MAN]

Originally Posted by jim wahl

myron,
the answer to your question is yes. I have been paid for an aluminum rear assembly by chrysler several times, however it was when i was driving the fwd spirit. Jim

lol..............

[Alan Roehrich]

Originally Posted by Greg Hill

I thought the rule book said any corporate rear. I know several people who run aluminum spools.

There is no rule I'm aware of on internal components, aluminum spools are legal, from what I understand.

The only real advantage to an aluminum center section is a reduction in unsprung weight. Unless of course you use an aluminum 9" center section that accepts GM 12 bolt components.

Once again, we have bigger issues than this in the class, this is merely another minor distraction.

Do I think aluminum center sections should be legal? Not really, and certainly not if aluminum radiators and drive shafts are not legal for cars not originally equipped with them. Do I think aluminum center sections are a huge issue? Not really, so long as they are not the ones that accept 12 bolt parts.

[Myron Piatek]

Originally Posted by sam the butcher

Plain and simple its a performace advantage. Gives you more weight to move around. Makes it more easy to make weight in lighter classes.

Then NHRA needs to be more specific about what they do instead of causing more questions & confusion. If they allowed Mopar to post for their aluminum center sections and pay out for their use for years, how can anybody think that they are not legal? Why would Mopar spend the money and post for something that isn't legal?

Yes, 10lbs can be a small performance advantage because it can be relocated to a better location. But it's considerably less than the aftermarket brakes that are allowed! As far as unsprung weight, the benefit is negligible in a drag car. It would be a bigger advantage in Nascar, offroad, etc. where there is considerable and constant suspension travel.

[Tony Janes]

This would be a good time to make the rules for Stock the same as Super Stock except for the engine and tires. Let roller rockers in stock, there is no reason to blow a motor up because you break a stamped steel rocker.

[Alan Roehrich]

No thanks to roller rockers in Stock Eliminator. We've got enough "performance enhancements" already. Give them roller rockers and they'll just break something else. If you're breaking enough rockers to have a recurring problem, then something is wrong. We haven't broken a rocker in 6 years, and we average around 125 runs a year.

[X-TECH MAN]

Originally Posted by Tony Janes

This would be a good time to make the rules for Stock the same as Super Stock except for the engine and tires. Let roller rockers in stock, there is no reason to blow a motor up because you break a stamped steel rocker.

UH OH......Ed. F. would not think so. Its moving toward S/S to much.......LOL. Just yanking your chain Ed to see if your awake today.

[X-TECH MAN]

Originally Posted by Alan Roehrich

No thanks to roller rockers in Stock Eliminator. We've got enough "performance enhancements" already. Give them roller rockers and they'll just break something else. If you're breaking enough rockers to have a recurring problem, then something is wrong. We haven't broken a rocker in 6 years, and we average around 125 runs a year.

Maybe you need MORE spring pressure and MORE RPM's to test the parts......

[gmonde]

Originally Posted by Stewart Way

No measuring and checking if you do your homework. Set the spare gear up at the shop. Keep the shims with it in the trailer. On a Dana you can spread the case or cool the ring gear, spool and bearings in a cooler of ice, slide it in after the pre setup pinion is installed, blow dry and your good to go. Been a long tine but I think we used to use .004 tight on the carrier bearings and with ice the shrinkage was just enough, Sure you might have to be under the car, but not much longer than with a chunk.

to add if they are replacing the same ratio that broke,its not a big deal as long as the pinion depth numbers marked on the pinion are the same or a 1 or 2 thousands off they can use the same shims ,dial indicate the back lash and your good ,if your picky hone your pinion bearing just so it slides on the pinion ,i use a solid pinion spacer this will allow the bearings to be tight it is some work but ,if planned its not bad gmonde

[Tony Janes]

The roller rockers is actually under consideration by NHRA