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Exhaust 5.7 HEMI Exhaust Discussion


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  #1  
Old 11-13-2013, 02:11 PM
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Default Not happy with Magnaflow Y Pipes

I made up a quick cross section sketch of the Magnaflow #10778 Y pipe that we commonly use on our trucks. I've highlighted with a red arrow showing a lip on the outlet side that will clearly be a restriction and cause reversion. Now I'm not sure if this is a flaw in the one I have or is it the way they are all built.

If someone has one laying around. Stick your hand inside and feel for that lip. Let me know what you find.
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File Type: jpg Maggie y pipe drawing.jpg (6.4 KB, 63 views)
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  #2  
Old 11-13-2013, 05:45 PM
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Wow! I'm not the only one that's anal.....

I swear, I too felt that when I had mine. I think it's a tad more evident than what your sketch portrays.

It really didn't concern at all, but for sheet-n-giggles, I pointed it out to my exhaust guy. His reply?

"Are you serious? C'mon Ed.... take you skirt off! It won't be an issue and most certainly be much better than the crushed scrap-metal on there now"

I don't believe reversion will be an issue as far as flow, performance and/or sound is concerned. My exhaust guy shares my opinion.

Good observation indeed.
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Old 11-13-2013, 05:57 PM
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this has 4 images of that Y pipe, move your cursor over the images to ZOOM in

http://www.etrailer.com/Accessories-...w/MF10778.html
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Old 11-13-2013, 08:36 PM
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I picked up both the Magnaflow #10778 Y Pipe as well as the Flowmaster #Y250300 Y Pipe. Let's just say the Flowmaster is a much nicer piece. It has very smooth edges and transitions inside. Where as the Magnaflow does not. Take a look at my pics.
Attached Images
File Type: jpg Y pipe (7).jpg (128.0 KB, 56 views)
File Type: jpg Y pipe (12).jpg (128.3 KB, 58 views)
File Type: jpg Y pipe (11).jpg (129.5 KB, 58 views)
File Type: jpg Y pipe (3).jpg (126.1 KB, 55 views)
File Type: jpg Y pipe (10).jpg (127.5 KB, 51 views)
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Old 11-13-2013, 10:19 PM
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If I was ever going to it, it would be the Flowmaster hands down.
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Old 11-13-2013, 10:35 PM
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That is actually not a restriction. It seems counterproductive at first, but it actually is better than a smooth transition. That lip will allow more air to be pushed through the pipe faster.

I certainly have been wrong before, but applying what I've learned, that is actually better than a smooth transition.

The velocity of the exhaust gas is theoretically zero immediately beside the tubing wall. The closer you get to the exact center of the tubing the faster the exhaust velocity. With that lip, you have more exhaust volume that is away from the wall of the tubing, which means more volume will enter the singles exhaust(in that y pipe). To optimize that design the lip would be "mushroomed".
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Last edited by snrusnak; 11-13-2013 at 10:39 PM.
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Old 11-13-2013, 10:46 PM
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Quote:
Originally Posted by snrusnak View Post
That is actually not a restriction. It seems counterproductive at first, but it actually is better than a smooth transition. That lip will allow more air to be pushed through the pipe faster.

I certainly have been wrong before, but applying what I've learned, that is actually better than a smooth transition.

The velocity of the exhaust gas is theoretically zero immediately beside the tubing wall. The closer you get to the exact center of the tubing the faster the exhaust velocity. With that lip, you have more exhaust volume that is away from the wall of the tubing, which means more volume will enter the singles exhaust(in that y pipe). To optimize that design the lip would be "mushroomed".
I know it's not a restriction. I know all about transitions and anti reversion properties. When air flow is going over the lip. It's not so great when airflow is going straight into a sharp lip as is on the 3" exit of the Magnaflow Y pipe. I'm gonna have to cut this y pipe in half to get my point across. And for the measly $20 it cost I probably will.
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Old 11-13-2013, 10:50 PM
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Send it to me,it'll save you the work of cutting it open,lol.
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Old 11-13-2013, 10:54 PM
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Quote:
It's not so great when airflow is going straight into a sharp lip as is on the 3" exit of the Magnaflow Y pipe
You don't understand. I know exactly what you are saying as I noticed it on mine when I got it. There is an approximately 1/8" to 1/4" lip sticking into the y pipe from the 3" exit. This is what I'm talking about. This is actually better than a smooth transition.

I know, like I said above it seems like it would be a restriction to the flow of the exhaust gases, but it's not. This concept is most often used with intake manifold design.

Here's a picture of an example of this being used in an intake manifold:



This will actually flow more than "smooth/flush" transitions.

You may know what a velocity stack is, it's similar theory. It would be best if the lip on the 3" exit of the y pipe was mushroomed, but still having the lip is not a bad thing, and I think it would actually be better than if it were smooth.

In reality though, it doesn't really matter. It probably makes a .00000001 hp difference either way lol.
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Last edited by snrusnak; 11-13-2013 at 11:02 PM.
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Old 11-13-2013, 11:01 PM
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I know, like I said above it seems like it would be a restriction to the flow of the exhaust gases, but it's not. This concept is most often used with intake manifold design.[/QUOTE]


Intake works under vacumn,not pressure like what's in a exhaust pipe.
Put a forced induction set-up on your intake,and smooth transitions will flow more then the step transistion
You don't build your header pipes to stick into the exhaust port.
You want smooth transitions under pressure,think stepped headers or collectors

Last edited by Hornet; 11-13-2013 at 11:04 PM.
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