Exhaust cutouts?

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Exhaust cutouts?

Post  Maddmattmustangs on October 21st 2010, 5:12 pm

Would exhaust cutouts be worth any power mounted infront of a muffler like right after the header? Pipes a 3 1/2 so that would be the cutout size and a 3 inch reducer welded at the end.
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Re: Exhaust cutouts?

Post  LivermoreDave on October 21st 2010, 9:47 pm

Several years ago NHRA dis-allowed tubular headers on the "Stockers". Several designs I had the opportunity to inspect simply had the "cut-out", if you will, installed in-line with the exhaust pipe just after the manifold. The muffler and the pipe that appeared to connect the muffler to the system was "T'd" off after the "cut-out". This allowed the "path-of-least-resistance" to follow the open "cut-out" and bypass the muffler!


******(ignore the asterisks)** >------ Muffler --->
************************** ^
Exhaust Manifold >-------> Cut Out >------->

My point is, install the opening of the "cut-out" in-line with the headers collector and "T" the exhaust pipe leading to the muffler on the side of the collector or the large diameter tubing you now call the "cut-out".

Damn, now I'm confused!
Dave.

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Re: Exhaust cutouts?

Post  Maddmattmustangs on October 21st 2010, 9:51 pm

So install the muffler on the part that sticks out Laughing
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Re: Exhaust cutouts?

Post  bb429power on October 21st 2010, 10:12 pm

Dave, I am so glad you see it the same way I do. I have always hated the design, the exhaust will want to keep flowing straight, not go out of its way to go through an open pipe off to the side. I have always wanted to make a better designed cut out because of this reason. Very Happy

That's why I have always liked the design of this x pipe that Jegs sells...
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Re: Exhaust cutouts?

Post  Maddmattmustangs on October 22nd 2010, 12:03 am

bb429power wrote:Dave, I am so glad you see it the same way I do. I have always hated the design, the exhaust will want to keep flowing straight, not go out of its way to go through an open pipe off to the side. I have always wanted to make a better designed cut out because of this reason. Very Happy

That's why I have always liked the design of this x pipe that Jegs sells...

That's exactly what I was thinking but makin sure I was on the right track Very Happy
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Re: Exhaust cutouts?

Post  Beast on October 25th 2010, 3:51 am

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cut out design

Post  wheelinhigh@aol.com on July 29th 2012, 1:00 am

This may be a little off topic, but why does every one design cut outs the same way? With the free flowing part as a after thought, like a T. wouldn't that affect flow? If you think about flow like water, then the water that flows into the T section would be hitting the blocked off wall. Trying to bounce off instead of flowing strait when it is closed, causing back pressure. even when the section is open the flow would want to continue its path strait into the existing pipe instead of exiting the cut out. I think it should be a Y with the butterfly in the center to direct the flow not to block it. Any one else think this way or am i just loosing it?

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Re: Exhaust cutouts?

Post  Beast on July 29th 2012, 3:24 am

wheelinhigh@aol.com wrote:This may be a little off topic, but why does every one design cut outs the same way? With the free flowing part as a after thought, like a T. wouldn't that affect flow? If you think about flow like water, then the water that flows into the T section would be hitting the blocked off wall. Trying to bounce off instead of flowing strait when it is closed, causing back pressure. even when the section is open the flow would want to continue its path strait into the existing pipe instead of exiting the cut out. I think it should be a Y with the butterfly in the center to direct the flow not to block it. Any one else think this way or am i just loosing it?

I'm with you. I think that it's best to have the cutout on the straight through, and have the pipe continue on the angle into an x pipe. That way there is minimum restriction when you want full power. I went with a unit like this:



http://www.ebay.com.au/itm/BadlanzHPE-Electric-Exhaust-Cutout-Cutouts-3-5-INCH-C-/180740378974?pt=Motors_Car_Truck_Parts_Accessories&hash=item2a14f7515e
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Re: Exhaust cutouts?

Post  wheelinhigh@aol.com on July 29th 2012, 11:17 am

I see what your saying about the straight through layout i think that's a good way to keep the flow straight and smooth. even if my idea for the smoother butterfly in the middle does not add that much more flow, it will still be cheaper than trying to port and polish heads. i think its worth bringing up to a few CNC buddy's.

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Re: Exhaust cutouts?

Post  wheelinhigh@aol.com on July 30th 2012, 8:03 pm

does any one have the mr.gasket cutout ? it looks from the pictures that the butterfly is in the middle. anyone have any idea what the insides look like ?

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Re: Exhaust cutouts?

Post  kim on July 30th 2012, 8:46 pm

Its a simple butterfly valve/flap.

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Re: Exhaust cutouts?

Post  Mustang-junky on July 30th 2012, 8:55 pm

The Mr. Gasket cut out is cast iron.

Jess
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Re: Exhaust cutouts?

Post  Beast on August 1st 2012, 4:10 am

I think that they only make them in 2 inch, or 2.5" or something. Too small IMO.
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