Airsign89
10+ Year Contributor
- 178
- 5
- Jul 4, 2011
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troy,
Michigan
Read it. "Aem EMS pulled a couple of degrees up top". Is this topic about exhaust systems or knock? Back on topic...
Edited
Edited
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Read it. "Aem EMS pulled a couple of degrees up top". Is this topic about exhaust systems or knock? Back on topic...
Edited
No one says exhaust tubing must be round.
Too much thinking "inside the box" going on in this thread.
Hal
Or dual 2.5", which would be easier to snake around stuff.
then placed it in a press to flatten it a bit to make it oval. Beauty of this technique is that cross-sectional area of the pipe stays the same while staying smooth
Except that the area doesn't stay the same. It gets less.
For a given perimeter, a circle has more area inside than any other shape.
That is, unless you are Dr Who
they HAVE to have the same area. Right?
Except that the area doesn't stay the same. It gets less.
For a given perimeter, a circle has more area inside than any other shape.
That is, unless you are Dr Who
DSM Forums - View Profile: Tort9320g and this: DSM Forums - View Profile: johnnytsi
Way way more to find but i looked at a few on the first page. Most dont mention exhaust but these say full 3" TBack. I imagine either one of these cars (just random examples i found) would gain 20+ hp if they kept the same 3" pipe and cut it down to 3 ft long or just straight down from the turbo. Longer pipes create more backpressure correct?
Could do a 4" off turbo come down to smooth transition into 2 2" or 2.5" pipes. As the other fella said, smaller pipes easier to bend and fit in to place. The transistion itself would cause flow impedance but would it still be worth it is the question. This is interesting. We all know with turbos, bigger is better for exhausts. Space and weight are the limiting factors for a 4" full lenth pipe. 5" would be even better , but i think id draw the line at 3.5 or 4 realistically.
What? How so? Air a tire up 50psi then place a load on it. Pressure didn't change because area never changed. Just the shape.
I'm confluzisssided now dammit.
Nherron: I was skeptical too. Circle area= piR(squared) Ellipse(oval) area is similar. piR(a)R(b) squared. radius A and radius B are the unknowns. That depends how far you smoosh the pipe but still, i have to agree, they HAVE to have the same area. Right? Someone flame me but in the process please educate me as to why im wrong.
I too looked at that and disagreed.
Actually, an oval can have less or the same area. What happens when you crush it too much? It becomes a flat piece of metal with no cross sectional area. Also I don't believe the above formula is correct due to the fact that it would net a larger area than the circle . The actual area would be 2* the integral from 0-diameter Given the formula for one side. Or turn it upright and it may work out to 2 parabolic formulas. I'm not 100% on it though.
What they have the same is their perimeter or circumference. That is what doesn't change as you distort it from circular to ellipitcal or any other shape.
If you have a circle of some perimeter, and any ellipse with the same perimeter, the area of the ellipse will always be smaller than the area of the circle with same perimeter.
You could spend a good couple hours proving this to yourself with formulas. Because, unfortunately, the formula for perimeter of an ellipse is not a simple one.
Perimeter of Ellipse
So basically, you can start out with numbers for the a and b dimensions of an ellipse, any ellipse you want. Calculate the perimeter of that ellipse. Then go find a formula for calculating the area of an ellipse (same web site has it) and calculate the area of your ellipse.
Now take your perimeter number and figure out how big a circle you would have with that perimeter. Get the area of that circle.
Now you have the area comparison.
Do this as many times as you want, with different ellipses.
Take coffee breaks as needed