Dual exhaust with SBC350 and turbo 400. Anyone run a crossover??

[Kicker]

First off...Yes I searched :D

I am going to be swapping in my 350 nad th400 in about a month. I am curious whether there is enough room to run a crossover? I would like since it will help the power output.

Just wondering who has been able to set it up this way. Does the front driveshaft cause issues?? Does the trans pan cause interference??

Any help would be appreciated! :D

Steve

[NE-RokToy]

why not run a big single exhaust? it will have the same benifits of dual with crossover but easier to route. Single 3.5" pipe would be about the same as dual 2.5" pipe as far as cross sectional area (3.5" = 9.61" and 2.5"= 4.91" x 2 = 9.8 ) T

[RockyXJ]

Originally posted by NE-RokToy
why not run a big single exhaust? it will have the same benifits of dual with crossover but easier to route. Single 3.5" pipe would be about the same as dual 2.5" pipe as far as cross sectional area (3.5" = 9.61" and 2.5"= 4.91" x 2 = 9.8 ) T

I agree with this as well. Same benefits, less carnage on the exhaust. I'd stick with a single if your playing on rocks and the such.
Jordan

[High5]

when i installed the vortec in my cj i tried the ol' two into one and i didn't like it. maybe it was the fact that the place i had do it didn't do a very good job but it was realy tight and i had some clearance issued. i ripped it out and put duals with glasspacks. alittle louder but lots more clearance:D

[Kicker]

I don't think two into one has the same benifits as a dual with a crossover. It might flow really well if it is large enough.

If the exhuast has to cross over to do the two into one, I don't see why it would take up more room to run a dual with cross over. Especially with 2.5" pipe.

Know what I mean?

Steve

[redruM]

Kicker what kind of t-case will bolt up to the TH400?

i have a buddy with an el camino (i know) 454, TH400 that he wants to convert to 4x4 and needs a x-case ???

[Chrisjeep7]

i would save your self the head ache and go dual flows or glass packs, even a single. is that crossover going to give you that much more power....no. hell any V-8 in a jeep is plenty of power, just run plain jane out the back exhaust. i have ran fender well headers, single and dual. i like the dual glass packs. are you building a street rod or a rock crawler? Ask your self that question on every decision you make.

Chris G.
:beer:

[Johncm]

What for do you need a cross over in a Jeep. The real benifits of this set up do not come on until in the higher RPM range. More like street rod stuff. In a Jeep, with a 350, the Y pipe configuration with no more than a 2 1/2 in pipe will work very well. Good torque curve down low, where you want it. Be sides, it takes up less room.

[Jakesteramalamajama]

Originally posted by Johncm
What for do you need a cross over in a Jeep. The real benifits of this set up do not come on until in the higher RPM range. More like street rod stuff. In a Jeep, with a 350, the Y pipe configuration with no more than a 2 1/2 in pipe will work very well. Good torque curve down low, where you want it. Be sides, it takes up less room.

You have it backwards. An exhaust crossover (H-pipe, X-pipe) helps horsepower in the lower RPM range because the the exhaust moving through the pipe coming from the opposite cylinder bank tries to equalize and acts as a venturi helping to scavenge or "suck" the exhaust out of the cylinder, thereby evacuating it more efficiently. An H-pipe also effectively increases the overall collector volume without restricting the exhaust flow, thereby simulating the effect of a longer header (perfect for Jeeps which usually have to use shorty or block hugger headers to acheive an in-frame V8 exhaust system utilizing headers).

This effect diminishes at high RPMs because the gases cannot bleed across an H-pipe fast enough. At this point, the exhaust system is just outgassing massive amounts with little finesse. A X-pipe is better in this respect in that you get most of the low-end gains and you get some high-end gains as well.

Here's a couple of sites where they talk about this:

http://home.earthlink.net/~micfly/crosspipe.htm
http://www.hedman.com/pages/XTREME-SCIENCE.html

HTH,
Jake

[Kicker]

The h-pipe does make more power down low. And it sounds better than a single exhaust.

I guess I will just see what the shop thinks. Whether he can fit it or not I don't know. But the guy I use is pretty good.

I'll let you guys know when I get it down.

Thanks,
Steve

[Kicker]

redruM- I am using the NP205 that came with it.