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Exhaust 5.7 HEMI Exhaust Discussion


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  #1  
Old 06-29-2010, 09:13 PM
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Default I am confused about exhaust

Hey Everyone!

I am getting really confused on here since the guys with new Rams are talking about X pipes. Now dont the new Rams have the dual outlet but it is not a true dual correct? I am under the impression that the new Rams are a single exhaust and out as duals.

Another thing the X pipe should be used with a true dual set up no??

I am just confused because the last few days there has been a couple of guys with new Rams talking about getting X pipes.

So can someone please clarify this for me haha

Thanks in advance!
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  #2  
Old 06-29-2010, 10:35 PM
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yeah scat if you run true duals you put the x pipe in there (it replaces the y pipe), i do believe for back presure, dont quote me on that
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Old 06-30-2010, 12:24 AM
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'09/10s w/ the notched bumper have the Y up front, SIDO muffler and the duals to the bumper.

Correct about X pipe. For true duals.
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  #4  
Old 06-30-2010, 01:02 AM
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Yes, "X" pipes are for true dual systems. It's also called a crossover pipe.

Why have a crossover or X pipe?

The firing order of all production V8s, regardless of make, has one cylinder in each bank that will fire within 90 degrees of crankshaft rotation of another cylinder in the same bank. This occurs twice during completion of the entire firing order. These two cylinders will be exhausting almost simultaneously into the same exhaust manifold system.

At the same time two cylinders exhaust in one bank, there is no activity in the opposite bank. The traditional H-pipe equalizer allows some of the excess pressure to bleed over to the 'quiet side' of the exhaust system, resulting in some low and mid-range torque improvements. At high RPMs, however, in traditional exhaust systems, the gases cannot bleed across the H-pipe fast enough to help power significantly. Performance systems with the H pipe design, attempt to over come this by using a shorter cross over pipe which is also slightly larger in diameter as the main exhaust, then would be used in a standard exhaust.

To overcome the power loss of "over loading" the H pipe design, Exhaust manufacturers came up with the X pipe design, which features a tangentially Siamese crossover junction to synchronize exhaust pulses. The X-pipe concept is to split the flow in the crossover junction, so the pressures on both banks will be equal and pulse-free after the crossover, regardless of the rpm. Volumetric efficiency and power are therefore improved at all engine speeds.
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Old 07-02-2010, 04:06 PM
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maddog you are like a walking book of knowledge
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Old 07-02-2010, 04:13 PM
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Bingo! In effect the H pipes, X pipes and siamesed pipes all serve to reduce back pressure and increase flow. They are especially useful on engines that need to sustain high RPM's such as round track race car engines.
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Old 07-02-2010, 04:29 PM
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Maddog very well put and give a guy like me a better understanding of what's what on exhaust. With that said, what are you running?
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Old 07-02-2010, 04:41 PM
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Quote:
Originally Posted by got hemi View Post
maddog you are like a walking book of knowledge
Or very good at Googling (which is a talent in and of itself!)

http://www.hedman.com/products/Defau...id=3447&v=more

Sorry dude. Long time Mustang guy and it sounded familiar.
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  #9  
Old 07-02-2010, 06:53 PM
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No worries, Sean. Knowledge is everywhere, you just need to know how to find it. Then when you find it, you share. But I am very familiar with the various iterations of this simple device, having raced a lot over the years. Racers look for every edge they can get to increase performance.

A crossover will help immensely with exhaust scavenging, promoting efficient flow. If you don't go too big with the opening or the pipe back to the tips, you won't suffer from loss of back pressure and lose any low end torque.

The question always was where to put the crossover or H pipe to your best advantage. An old racer's trick (thanks for reminding me about that, Randy!) was to paint the inside of both exhaust pipes from the header collector back. Then, they went out and ran the car until the pipes got hot.

As the exhaust gases move down the pipes, they start to cool, slowing down and changing the pulse rate. Where the paint wasn't burned off was the point where the gases had cooled, and the pulses had slowed, enough to where they wanted to "crossover".

This was the point where the crossover is installed to keep the gases moving towards their ultimate destination.
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Old 07-02-2010, 07:11 PM
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Was certainly meant as friendly nut bustin'. Hope it came across that way.

I never got that involved w/ trying different types. My drag racing days were hobby only and it was my daily driver (singple plane w/ a double pumper, plastic race buckets, no a/c or ps so still leaning towards serious). Did longtubes and shorties but never tried the X. Always ran an H as, for me, I thought they sounded better. Car was 4.56 gears and a 5spd in a 3200# car so it likely would have liked the X crossover. It didn't need any more tq w/ a 28" tire and those gears.

The biggest thing is most cars are cammed with the idea that there's a somewhat restrictive, emissions legal system in place. A completely free flowing exhaust is good, but you'd need a custom cam to make the most of it. All give and take. Want to keep low end boosted? You're gonna give up a little up top. Balls to the wall? Be willing to suffer w/ the low end losses, or gear/stall past it.
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