Slant Six Forum :: Making my own exhaust.

Quote:

Yeah, its kinda' like when someone goes to HF to buy their hydraulic pipe bender to use for rollbar or exhaust tubing and wonders why it wrinkles the bends. In the industrial world, pipe and tubing are two different things and are measured totally different in size, so make sure you are clear on how you are classifying what you are needing to the company before you buy it. It can save you a lot of expense and headache.

So the main difference is that tubing is mandrel bent and piping is bent with a hydraulic pipe bender? Not to mention "piping" is used for pretty much every other application that would not be exhaust. So the misconception is "exhaust pipes" are underneath a vehicle.

Author:	exoJjL [ Fri Nov 18, 2011 1:40 am ]
Post subject:
Quote: Yeah, its kinda' like when someone goes to HF to buy their hydraulic pipe bender to use for rollbar or exhaust tubing and wonders why it wrinkles the bends. In the industrial world, pipe and tubing are two different things and are measured totally different in size, so make sure you are clear on how you are classifying what you are needing to the company before you buy it. It can save you a lot of expense and headache. So the main difference is that tubing is mandrel bent and piping is bent with a hydraulic pipe bender? Not to mention "piping" is used for pretty much every other application that would not be exhaust. So the misconception is "exhaust pipes" are underneath a vehicle.

Author:	WagonsRcool [ Fri Nov 18, 2011 10:53 am ]
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Mandrel-bent tubing means that the bending machine has a part that fits & supports the inside of the tubing. The bends are smooth & the are same diameter as the straight sections. Generic benders just "mash" the tubing into shape from the outside- the bends are wrinkled & crushed down to a smaller diameter. A 2.5" tube might end up 2.25" or (much) less. I've used flux-core wire feed welders & can't reccomend them. They work,but gnerate LOTS of sparks, spatter, & slag. The extra $250 I spent on a gas MIG conversion kit & a small welding gas tank (C25) was the best money I ever spent. Yep, exhaust "pipes" is just slang.

Author:	CNC-Dude [ Fri Nov 18, 2011 2:45 pm ]
Post subject:
Quote: Quote: Yeah, its kinda' like when someone goes to HF to buy their hydraulic pipe bender to use for rollbar or exhaust tubing and wonders why it wrinkles the bends. In the industrial world, pipe and tubing are two different things and are measured totally different in size, so make sure you are clear on how you are classifying what you are needing to the company before you buy it. It can save you a lot of expense and headache. So the main difference is that tubing is mandrel bent and piping is bent with a hydraulic pipe bender? Not to mention "piping" is used for pretty much every other application that would not be exhaust. So the misconception is "exhaust pipes" are underneath a vehicle. No, the difference is in the sizing, for instance, 1-1/2" pipe and 1-1/2" tubing are not the same sizes. If you order 1-1/2" pipe, it will be 1-1/2" on the ID( inside). If you order 1-1/2" tubing, it will be 1-1/2" on the OD(outside diameter). So you need to have the correct mandrel for either pipe or tubing. Using a 1-1/2" pipe mandrel for 1-1/2" tubing will ruin the tubing because the radius of the pipe mandrel doesn't fit the tubing correctly to support it as you make the bend. Pipe and tubing are two completely different things, so make sure you make that distinction when you talk about it to anyone in the industry or you will get the wrong product.

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