why is a cat-back better than just a pipe with a muffler?
Supreme Member
Joined: Jun 2001
Posts: 9,550
Likes: 4
From: Charleston, SC
Car: 91 Camaro Vert
Engine: 02 LS1, HX40
Transmission: 2002 LS1 M6
the aftermarket catbacks usually have larger tubing and have mandrel (spelling?) bends..
a normal muffler shop crushes the inside of the pipe when it makes bends.... the aftermarket ones have smooth turns..
now all that is suppost to make it flow better....
also, its generally cheaper to bolt in a kit, then to have a shop take the time to make one.. esp if they make one by welding together mandrel bends (that they have to buy) instead of making their own crushed pipe.....
and you can bolt on most kits in the driveway...
now if you have a small welder and some time, you can make your own, but to most people its not worth it.. they just want to bolt on somthing that sounds good and works better then stock and go...
did that help? heh its late but i cant sleep, so what i typed may not make sence.. hehe
a normal muffler shop crushes the inside of the pipe when it makes bends.... the aftermarket ones have smooth turns..
now all that is suppost to make it flow better....
also, its generally cheaper to bolt in a kit, then to have a shop take the time to make one.. esp if they make one by welding together mandrel bends (that they have to buy) instead of making their own crushed pipe.....
and you can bolt on most kits in the driveway...
now if you have a small welder and some time, you can make your own, but to most people its not worth it.. they just want to bolt on somthing that sounds good and works better then stock and go...
did that help? heh its late but i cant sleep, so what i typed may not make sence.. hehe
Supreme Member
Joined: Jun 2001
Posts: 9,550
Likes: 4
From: Charleston, SC
Car: 91 Camaro Vert
Engine: 02 LS1, HX40
Transmission: 2002 LS1 M6
Originally posted by joshwilson3
When someone bends a pipe using mendrel, what does it do to keep the pipe smooth inside? What do they do different than someone else would do by just bending it? Is it a special method or special equipment to bend the pipe?
When someone bends a pipe using mendrel, what does it do to keep the pipe smooth inside? What do they do different than someone else would do by just bending it? Is it a special method or special equipment to bend the pipe?
Originally posted by joshwilson3
While I am thinking of that, when you get headers. you know, they have bends in them, are they always bent using mendrel? Or do you have to ask the company if they mandrel bend there headers? For an example, Hooker headers.
thanks
While I am thinking of that, when you get headers. you know, they have bends in them, are they always bent using mendrel? Or do you have to ask the company if they mandrel bend there headers? For an example, Hooker headers.
thanks
matter of fact, i usually see thease tiny little lines across the pipe... im totally guessing here, but i think it just grabs the pipe all the way around a little at a time and bends it or somthing.... or perhaps they stick somthing in it, i donno... would give me somthing good to look up online when im bored though
Supreme Member
Joined: Jun 2001
Posts: 9,550
Likes: 4
From: Charleston, SC
Car: 91 Camaro Vert
Engine: 02 LS1, HX40
Transmission: 2002 LS1 M6
heres what i found after a quick search:
http://www.bankspower.com/Banks_FridayNight_020102.cfm
they have a whole little artical with pictures... but heres a small snippit:
http://www.bankspower.com/Banks_FridayNight_020102.cfm
they have a whole little artical with pictures... but heres a small snippit:
The larger the tubing, the more severe the crimping will be with regular tube benders. Shrinking the diameter of the tubing at each bend negates the benefit of going to larger-diameter tubing.
Fortunately there's a solution. It's called mandrel bending. It's a bit more costly and time-consuming, but it's very effective. A mandrel tube bender is very similar to the Huth-type in that it uses a pair of half-round steel dies to hydraulically bend the outside of the tubing. The difference is that the mandrel bender inserts an articulated steel "stiffener" (the mandrel) inside the tube to keep it from collapsing. It's sort of like a series of three or four metal donuts (held together by a ball-and-socket and spring arrangement) just a hair smaller in diameter than the inner diameter (i.d.) of the tube. It's really a pretty simple system that has been around for quite a while.
Fortunately there's a solution. It's called mandrel bending. It's a bit more costly and time-consuming, but it's very effective. A mandrel tube bender is very similar to the Huth-type in that it uses a pair of half-round steel dies to hydraulically bend the outside of the tubing. The difference is that the mandrel bender inserts an articulated steel "stiffener" (the mandrel) inside the tube to keep it from collapsing. It's sort of like a series of three or four metal donuts (held together by a ball-and-socket and spring arrangement) just a hair smaller in diameter than the inner diameter (i.d.) of the tube. It's really a pretty simple system that has been around for quite a while.
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