I was reading the rule book because i plan on entering next year and first thing that caught my eye was "Flexible Tubing or "flex pipe" prohibited in all categories." What do you guys use instead for flexiblity?

Im running a 3 inch downpipe with a flexpipe at the end of it so it doesnt crack. Am i going to need to change that now to solid pipe?

 

Yep looks like your going to need to change that.

I dont use anything for flexability other than the stock rubber mounts that go on the exhaust hangers... no problems here.

 

Enter the exact rule, so we can see it.

John

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Luserkid &raquo;</TD></TR><TR><TD CLASS="quote">I was reading the rule book because i plan on entering next year and first thing that caught my eye was "Flexible Tubing or "flex pipe" prohibited in all categories." What do you guys use instead for flexiblity?

Im running a 3 inch downpipe with a flexpipe at the end of it so it doesnt crack. Am i going to need to change that now to solid pipe? </TD></TR></TABLE>

A flex bellows or the shady Pep Boys/Autozone flexible crap? I can't imagine a flex bellows like the one below being illegal, but I could be wrong.


Thats hella weak if these guys aren't allowed.

 

They can't mean that. It would be retarded if they outlaw flexpipes but still make you run full exhaust.

 

i have issues with those god damn things. all the headache that cost me.......

 

i run a flexpipe as well , looks like im gonna have to look at some options.

 

I'm thinking they mean the stuff you see people making their own cold air with. Kinda like dryer vent?

Would really like to see the whole rule as it is used in the paragraph.

 

http://www.jcwhitney.com/webap...10101

I hope this is the crap they're referring too. This is what I meant before, and what I think b18cx is referring to as well.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NHRA Rule book &raquo;</TD></TR><TR><TD CLASS="quote">All cars must be equipped with exhaust collectors, headers, or stacks installed to direct exhaust out of car body to rear of car , away from driver and fuel tank. Flexible tubing, or "flex pipe", prohibited in all categories. All Street Stock, Sport FWD, Sport RWD and E.T. Bracket cars must be equipped with functioning mufflers and may be required to meet maximum decibel limits at certain facilities. If mufflers are used, they must be securely attached to exhaust system and car body or frame.

Part of NHRA's mission is to preserve the right to race. In many communities, the right to race is contingent upon reducing noise and complying with local noise and muffler laws, ordinances, regulations, or agreements. Therefore, all competitors must comply with any muffler rules applicable to his or her class in the rule book and must comply with any noise-reduction requirements (including mufflers) mandated by any member track at which he or she races. Member tracks have the authority to impose muffler rules and noise regulations beyond those required by the NHRA rule book. </TD></TR></TABLE>

I have a flex pipe like the one pictured up above. Got it at a local muffler shop. Is that the type thats illegal? Anyone run those in competitions?

 

I'm willing to bet they mean flexible tubing and not the actual flex pipe that we all have. I wouldn't make sense to restrict a flex pipe since we all know that after a few hard launches, we'd rip the exhaust right off without one.

 

CALLL TOM AT CAMP1320 HE IS THE NHRA "TECH GUY"

 

we don't use any "flex pipe" in our system. hasport mounts= very little engine movement= no need for "flex pipe".. or what movement there is the rubber hangars take care of...

Charlie

 

Without a flex pipe, you are making a huge lever arm out of the exhaust that will try to rotate the manifold and downpipe. That can't be good for durability.

 

You could get some play with slip-fit non-welded tubing if you can't use a flexpipe. Just a thought.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Finest &raquo;</TD></TR><TR><TD CLASS="quote">I'm willing to bet they mean flexible tubing and not the actual flex pipe that we all have. I wouldn't make sense to restrict a flex pipe since we all know that after a few hard launches, we'd rip the exhaust right off without one.

</TD></TR></TABLE>i agree

 

im pretty sure its referring to the fkex piping that sorta looks like dryer exhaust tubing... pretty much an entire flexable pipe... not a flex section like everyone has

 

yea, tom thats wut im talkin about

 

This is what they mean:



not a flex section like the one above..

And like someone said, with no flex section, all that stress going directly to the manifold... can't be good.