Part Time 4WD Conversion

BEAUDESERT MANDREL BENT EXHAUSTS

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.

Normal Pipe Diameter	Press Bent Area (Square Inches)	Mandrel Bent Area (Square Inches)
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. The C.N.C. Benders achieve that in 30 seconds at the touch of a button.

The Picture Tells 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!


Fig A		Fig B

Systems available for the following 4WDs
Available in both Stainless Steel and Mild Steel.

Toyota
100 Series Land Cruiser	Factory Turbo, including Dump Pipe 3" V8Petrol, Extractors 2 3/4" exhaust 4.5Petrol, Extractors 2 1/2" exhaust
80 Series Land Cruiser	Factory Trubo, including Dump pipe 3" 4.5 Petrol, Extractors 2 3/4" exhaust
Prado 2000 Model	Factory Turbo, including Dump pipe 2 3/4"
Prado 2004 Model	Factory Turo, including Dump pipe 2 3/4"
Hilux 2000 on Dual Cam & Cab Chassis	Factory Turbo, including Dump pipe 2 ¾”
79 Series Land Cruiser	Factory Turbo, including Dump pipe 3”
75 Series Land Cruiser	Non-Factory turbo, from Dump pipe back 3”
Nissan
GU Patrol 2.8	Factory turbo, including Dump pipe 2 ¾”
GU Patrol 3Ltr	Factory turbo, including Dump pipe & exchange convertor 2 ¾”
GU Patrol 4.2 Wagon	Factory turbo, including Dump pipe 3”
GU Patrol 4.2 UTE, Coil & leaf sprung	Factory turbo, including Dump pipe 3”
GU Patrol 4.2 UTE and Wagon	Factory turbo, no Dump pipe 3”
GU Patrol 4.2 Wagon	Factory turbo, from Dump pipe back 2 ½”
GU Patrol 4.2 UTE, Coil & leaf sprung	Factory turbo, from Dump pipe back 2 ½”
GU Patrol 4.2 Wagon	Non-turbo, from engine pipe back 3”
GU Patrol 4.5 petrol	Extractors and full 2 ¾” exhaust
GU Patrol 4.8 petrol	Extractors and full 2 ¾” exhaust
GQ Patrol 2.8	Factory turbo, from Dump pipe back 2 ¾”
Navara 3Ltr	Factory turbo, Including Dump pipe 2 ¾”
Holden
Rodeo 3Ltr 2000 model	Factory turbo, Including Dump pipe 2 ¾”
Rodeo 3Ltr 2004 model	Factory turbo, Including Dump pipe 2 ¾”
Ford
F250 7.3Ltr	Factory turbo, 4” system.

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