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HotRodGuy · 04-05-2002, 06:56 PM

Mandrel bent is talking about the actual bend itself. There are two types of pipe bending: Mandrel and Crush.

The crush bend is what most muffler shops do. You put the pipe in a bending machine and it bends the pipe causing small indentions on the inner side of the bend which, on high hp engines, could cause the exhaust to slow down and create turbulance in the exhaust flow.

The mandrel bend is what is on the more expensive premade, bolt on systems. There is a special way to bend the pipe in which you don't get those indentions and the exhaust flows more smoothly. I think that they put sand (or sumpthin) inside the pipe to keep from "crushing" it. But don't quote me on that part.

Change subject...
I would just like to add that so far I've replied to three different threads, all relating to this same basic topic...all today. It would be nice if people would take the time to look through the previous topic's to see if maybe, just maybe there might be one that relates to their question before they post a new topic. I hate to post the same info in three different threads, about the same thang, on the same day <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/confused.gif" border="0" valign="absmiddle" alt='???'>  but I don't mind sharing my hot rod knowledge with others. <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/biggrin.gif" border="0" valign="absmiddle" alt='

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04-05-2002, 06:56 PM	#11
HotRodGuy Leaky Injector Join Date: Mar 2002 Location: Tennessee Age: 54 Posts: 105 Trader Rating: (0)	Mandrel bent is talking about the actual bend itself. There are two types of pipe bending: Mandrel and Crush. The crush bend is what most muffler shops do. You put the pipe in a bending machine and it bends the pipe causing small indentions on the inner side of the bend which, on high hp engines, could cause the exhaust to slow down and create turbulance in the exhaust flow. The mandrel bend is what is on the more expensive premade, bolt on systems. There is a special way to bend the pipe in which you don't get those indentions and the exhaust flows more smoothly. I think that they put sand (or sumpthin) inside the pipe to keep from "crushing" it. But don't quote me on that part. Change subject... I would just like to add that so far I've replied to three different threads, all relating to this same basic topic...all today. It would be nice if people would take the time to look through the previous topic's to see if maybe, just maybe there might be one that relates to their question before they post a new topic. I hate to post the same info in three different threads, about the same thang, on the same day <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/confused.gif" border="0" valign="absmiddle" alt='???'>  but I don't mind sharing my hot rod knowledge with others. <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/biggrin.gif" border="0" valign="absmiddle" alt=''> __________________ '91 240sx SE Fastback (sold to a kid who wrecked it) '93 Chevy Silverado '03 Chevy Cavalier '05 Chevy Tahoe If it ain't broke... don't fix it, just tweek on it and make it faster!