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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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  #26  
Old 12-22-2006
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I can't find what I want online, but here is a link that might give you something to think about. Go ahead with the X if you use a straight through (non baffled) muffler design, but use an H for a baffled design. On v8s this has been seen to work best. No on a v8 there is a definite HP and TQ increase with a crossover, but on a v6 it might be just for sound tuning more than anything else. I doubt if it would hurt.

http://www.mustangforums.com/m_1028601/printable.htm

Kind of contradicts itself:
Quote:
Some of you ask about a Cross Over on a V6.

In the case of the V6, with their “Even Firing Sequence… Having a crossover or not, is very dependent on the size of the exhaust and distance from the engine of the pipes placement. A cross over is not required if the exhaust is “tuned” to the engine. Tuned systems are nearly always without a crossover pipe because the length and diameter of the exhaust is specifically designed to work with your engine at a specified RPM Range to avoid reversion and scavenging.

On a V6 there is no need for a crossover due to the even firing engine. However, it has been proven that in some instances, a crossover pipe will decrease backpressure and allow for a higher flow. If the crossover pipe is too close to the engine, it allows the pulse timing of the opposing cylinders exhaust cycles, to crash into each other – that is to say, the pressure from a right cylinder will still be present in the left pipe when the left cylinder opens to vent. Too far a placement can create a “Pulse Vacuum”, causing diminished pressure on the venting opposing cylinder, causing decrease in torque (Called Scavenging). .

Proper design and placement of the cross over will allow a balance of pressures across the system and therein increase torque, especially at lower RPM.

Also, it has been shown that having a cross over pipe mellows out the raspy “ricer” sound that occurs above 3000rpm. So some people install them just for their “sound” value.

So, the bottom line is, you probably should have a cross over pipe on a V6 exhaust, even though it is not needed. There is minor performance gain and sound gain as well.
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  #27  
Old 12-22-2006
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I'll rephrase his last comment with my edition in bold:

So, the bottom line is, you probably should have a cross over pipe on a V6 exhaust, even though it is not needed. However, you must locate it correctly or it will hurt performance.
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  #28  
Old 12-23-2006
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Quote:
Originally Posted by n3elz
I'll rephrase his last comment with my edition in bold:

So, the bottom line is, you probably should have a cross over pipe on a V6 exhaust, even though it is not needed. However, you must locate it correctly or it will hurt performance.

John explain this more, how do you locate the "correct" spot?
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  #29  
Old 12-23-2006
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I think it's in refence to how far back it is from the headers. Which makes sense, but how does one find the best possition is beyond me.
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  #30  
Old 12-23-2006
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The old method for locating the sweet spot is this:

Fab up the exhaust without a crossover and then paint the exhaust with a paint that will burn a little. Drive it hard for a few minutes and then see where the paint burns off the most. This will be where you need to put the crossover.

I wish I could find the articles I have seen in the past on V6 exhaust on the net, but I can't. Sorry.
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  #31  
Old 12-28-2006
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Quote:
Originally Posted by 01xltranger4x4
This is true only on 04+ 4.0's, as they have 3 cats.

Our 01-03 4.0's have 4 cats, and they defenitly dont sound as good as the 04+ does.

Sorry to re-open a old topic, but are you saying that I could take off my last cat when I install a new exhaust and still pass emission?
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  #32  
Old 12-28-2006
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i think that would be cool
X pipe on a 4.0
it should sound bad a**
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  #33  
Old 12-28-2006
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Quote:
Originally Posted by DerangedPony
Sorry to re-open a old topic, but are you saying that I could take off my last cat when I install a new exhaust and still pass emission?

Yes, but I believe that you will trip a SES light since yours in an 03. My 04 has no o2 sensor after the 3rd cat, so removal isn't a problem........
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  #34  
Old 12-28-2006
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On a side note, I would really like to make my truck a true dual setup. I think that it would be very unique, and if it is setup properly, I see no reason that performance would suffer. My question now is....... Is the above mentioned method correct for custom fabing an H pipe? what kind of sound and performance would be noticed for me seeing as how I have all stock pipe with 40 series delta flow in place of the stock muffler?
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