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-   -   Why No Protest? (https://classracer.com/classforum/showthread.php?t=29762)

Ed Wright 11-18-2010 01:37 PM
Re: Why No Protest?
 
Quote:
Originally Posted by x-tech man (Post 222975)
x 2
x 3

Dave Casey 11-18-2010 02:31 PM
Re: Why No Protest?
 
It really is an insignificant change as, Yes, there are already springs that do the job. It may actually save some people money, as they are not limited to the configuration rules we had before. It took me a few sets to get a spring for my 427 that fit the "single spring with damper" required for my combo. With this rule, I would've had an easier and less expensive time getting the spring I needed.

Chad Rhodes 11-18-2010 02:45 PM
Re: Why No Protest?
 
Quote:
Originally Posted by Dave Casey (Post 223008)
It really is an insignificant change as, Yes, there are already springs that do the job. It may actually save some people money, as they are not limited to the configuration rules we had before. It took me a few sets to get a spring for my 427 that fit the "single spring with damper" required for my combo. With this rule, I would've had an easier and less expensive time getting the spring I needed.
very well put Dave. This is one rule change that may have a positive effect on the racer's budget.

Steve Williams 11-18-2010 03:08 PM
Re: Why No Protest?
 
Quote:
Originally Posted by GUMP (Post 222962)
My guess is that the next change will be aftermarket rockers due to all the rocker failures we will soon see!
Gump,

You are a very smart man or your method of prediction is near unbeatable. That is where the rocker arm situation is headed. Roller tip or full roller is probably coming down the road.

Larry Fulton 11-18-2010 03:12 PM
Re: Why No Protest?
 
Quote:
Originally Posted by bob pagano (Post 222956)
nhra has finally figured out how they are going to get rid of stock, after all the cars are already ss
amen...
Thats what i've been saying for the past 10 years!

danny waters sr 11-18-2010 06:41 PM
Re: Why No Protest?
 
Quote:
Originally Posted by Steve Williams (Post 223022)
Gump,

You are a very smart man or your method of prediction is near unbeatable. That is where the rocker arm situation is headed. Roller tip or full roller is probably coming down the road.
Allready ok at IHRA now in stock

Rick Leininger Jr. 11-18-2010 07:02 PM
Re: Why No Protest?
 
There are 1.300" dual springs available that are 850 lbs.+ over the nose, some of you guys are kidding yourselves if you don't think this rule will get taken advantage of.

Steel "hydraulic" roller lifter bodies are available. Any pushrod OK, and the heads can be ground for them. Now any spring that fits the pockets. The rocker will be the weak link.

Alan Roehrich 11-18-2010 07:10 PM
Re: Why No Protest?
 
There's a limit to how much spring pressure you can use, and after that, you're just wasting power and creating problems. If you think the valve spring rule will suddenly add 1000RPM of usable power band you will be sorely disappointed in most cases.

You can only make a cam lobe so aggressive before you run off the edge of the lifter. There's already plenty of spring available to deal with that limiting factor.

It seems a lot of people thing "if a little is good, more is better, and too much is just right". That is not necessarily true with valve spring pressure.

It is not just valve spring pressure that is breaking rockers.

X-TECH MAN 11-18-2010 07:53 PM
Re: Why No Protest?
 
Quote:
Originally Posted by Alan Roehrich (Post 223057)
There's a limit to how much spring pressure you can use, and after that, you're just wasting power and creating problems. If you think the valve spring rule will suddenly add 1000RPM of usable power band you will be sorely disappointed in most cases.

You can only make a cam lobe so aggressive before you run off the edge of the lifter. There's already plenty of spring available to deal with that limiting factor.

It seems a lot of people thing "if a little is good, more is better, and too much is just right". That is not necessarily true with valve spring pressure.

It is not just valve spring pressure that is breaking rockers.
Lobe design causes a lot of harmonic problems. Incorrect heat treatment on some of the out of country made parts cause a bigger problem. Buy known quality parts and have them frozen and coated helps. Check your rocker arm geometry.

Rick Leininger Jr. 11-18-2010 09:34 PM
Re: Why No Protest?
 
Good thing my lifters don't have edges. Valve springs and 6.14 gears on order. :D


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