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MANDREL BENDING WORKS!
To see how much of an improvement mandrel bending can make, take a look at the chart below, which shows the effective cross-sectional areas for press bent and mandrel bent pipes. In the press bent column, two numbers are shown, corresponding to a 20% and 30% reduction. 20% is typical for a slight bend, 30% for a larger bend.
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Nominal Pipe
Diameter |
Press Bent Area
(Square Inches) |
Mandrel Bent Area
(Square Inches) |
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2.25" |
2.74 / 3.13 |
3.92 |
|
2.5" |
3.43 / 3.92 |
4.90 |
|
3" |
4.94 / 5.65 |
7.06 | |
| As can be seen from the table, a 2.5" press bent downpipe is actually smaller in cross-sectional area at the bend than a 2.25" mandrel bent downpipe!
Consider how long it would take to make one piece of tubing, with three bends in it, if you had to cut it in three places, cut out each bend from pre-bent tubing, and then weld each bend in place by hand. That's nine cuts and six 360-degree welds. Our C.N.C. Benders achieve that in 30 seconds at the touch of a button. |
PICTURES TELL THE STORY
As you can see in figure A, the 3" pipe that is mandrel bent measures 3" inches at the centre of the bend. True 3 inches throughout the pipe will give you 35% less backpressure. Less backpressure equals increased horsepower, torque, and improved fuel economy.
As you can see in figure B, the 3" pipe that is stock bent measures 2 and 1/2 inches at the centre of the bend. You don't benefit much by having a 3" pipe with 2 and 1/2 inch restriction in each bend. Your exhaust system is only as good as its weakest link. Why settle for restrictive sub par bending!.
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