Is there any rule of thumb that limits the length of the H pipe???? In other words the connecting pipe, is it more effective the shorter it is???

 

Don't think it really makes much difference, but I could be wrong.

IIRC, all its there for is to balance the pressure between the pipes on a true dual system, as well as to tame the sound a little.

 

Anyone else have anything to say???

I figured some of you would be all over this thread.

I need to decide if its worth it. The H pipe is gonna be pretty long, like around 3 feet, but it'll be way up there by the headers where the pulses are strong.

 

why would the H pipe be so long? i ran true duals on mine and it's maybe a foot in length. how'd you space out your pipes so much? I doubt that it'll make any difference since the main goal is to balance pressure differences. I'm sure even a long H pipe is better than no H pipe.

 

I have a side exhaust, not tail exits. I ran the exhaust such that i would get the best clearance, I wanted to run an H - pipe but i would have been sacrificing clearance.

I am going back into the exhaust to install 2 bullet style mufflers in addition to the moroso Spiral flows to quiet it down some, and I figure I'll install an h-pipe while I am at it, just not sure how i want to do it yet.

Check out the pics of the exhaust and tell me what you think.

https://www.thirdgen.org/techbb2/sho...hreadid=260529

If I could use oval tubing, it would work awesome.

 

The shorter the better. When making custon h-pipe apps, you generally try and find the hottest part of the pipe after the collector to place it (that's why they are always to the front of the car rather than the rear).
If you have too long of a pipe you kill the heat, velocity and general effectivness of the balancing. That's why x-pipes are even better. Shortest path as well as limited directional flow change. hth.

 

If you want an H-pipe, probably the best place to do that is up near your headers under the oil pan, where the factory routed the original Y-pipe.

 

My thought exactly.

With my setup that will be the shortest route possible.

It might be a pain to cut the existing pipe and then install the t - pieces though.

We'll see.

About the h-pipe losing heat and whatnot....I think if i do it way up there by the collectors like you are talking about, there is no possible way it won't stay hot.

 

The usual trick is to paint the pipes, or draw a thick crayon mark the length of the pipe. Where ever the paint burns or the wax melts first is where you want your H pipe.

 

Yep. We used to use temp tape. Helluva lot easier and I was always lazy.

As for placing it to apparently 'keep it hot', you are missing the point. You want to place it at the hottest part of the exhaust after the collectors.

You are playing with the exhaust's pulses and as such you are trying to do so in a specific way. You don't want to make too long a pipe as you with throw off the pulse by altering the heat (and volume) velocity and the pulse itself.

If the pipe is going to be really big, it is better to run no pipe at all.

 

Are you 100 percent positive that it is better to have no pipe at all???

My idea is to run the h-pipe right where the STOCK drivers side manifold pipe comes down and under the oil pan to connect and form the y-pipe.

Since I have duals and not a y-pipe, I have that space free.

Keep in mind that I have hooker shorties, so I basically would be placing the h-pipe about 6-8 inches away from the collector.

good idea? Bad idea?

 

I doubt it. Any pipe is better than none. Shorter is better, yes, but any pipe is better than none. Even if the pipe is unusually long, it will still do its job, just maybe not as well as a shorter pipe.

 

alright guys, i just put my true duals back on my car but this time using a little better muffler (tamer, summit chambered muffler) and an H-pipe which was not incorporated into the last setup. i am using hedman longtubes and so the collectors exit right where the torque converter is. i can't run the h-pipe there. essentially, for ground clearance sake. i have it placed right behind the crossmember for the tranny. is this being effective? or did i waste $37?

 

i placed mine right after the "s-bends" about where the trans crossmember is. works well for me. also, part of the reason the exhaust sounds tamer is due to the H-pipe it's usually worth a few decibels quieter.


which chambered mufflers also?

 

the one for $39.99 it's the one called the "fully welded muffler" that summit puts out. once i get it all welded up and the exhaust leaks fixed, it's going to sound absolutely bad!!!!!

so your is right under the tranny crossmember? i may put mine there then. pics of ground clearance? i guess it wouldn't be any different then having regular piping there. mine is just a little bit behind the x-member as of now.

 

check my cardomain site for pics of ground clearance. link in sig. definately have to tell me how those cheap summit mufflers sound and whether or not they're quiet.

 

No, any pipe is not better than none. What if that pipe is so long/big that the heat loss and pulse weakness completely screw up the flow and energy of the adjoining pipe?
Think like this, if you unecessarily cool the adjoining pipe's pulse, how much distance did you just loose on that pulse (in terms of energy)? If you didn't do anything at all, there would have been no loss of energy and the same temperature would have been seen further down the pipe if not at the exit. You cool it too quick and you are diminishing any help to the scavanging effect you are trying to create.

 

still gotta few exhaust leaks from not having it welded up...put the h-pipe where yours is this morning. gotta say, it sounds better not having all those extra little exhaust leaks from the little extenders i made up. welding it up on monday or tuesday.

very pleased with the sound. i took my g/f out today in it and we could have a conversation at normal talking levels without a problem, except under heavier acceleration...one time wot, just for fun, she wasn't as happy as i was....

you have the moroso's right now, right? well, i would definetly recommend the summits over the moroso's anyday. considering that you and i still have mild-moderate 305's, (anything slower than 12's is moderate in my book and we both are sooo...) these mufflers will flow just as good.

 

cool. do you have the part number off hand of those summit mufflers? glad to hear it quieted down a bit. mine's a little obnoxious, but much more tame than some i've heard.

 

p/n SUM-633222


they rock...

 

what would you compare those mufflers to sound wise? flowmasters? or still louder than that. if i do decide to swap out these moroso spiralflows i'd want something much quieter.

 

compare them to something....hmmm...they definetly have that chambered whistle to them. i am very pleased with the sound. maybe similar to a two-chambered flow.

 

How bout that H-pipe huh?

Darn thread stealers...LOL.

 

i think your idea would be great, i also think that the shortest h-pipe will be the most effective. maybe bending the pipes inward a little will help? the pipe shouldn't have to be a whole lot more than 12-14 inches. get the car up in the air and look under there man.