Mandrel bent Versus Normal exhaust

Submitted: Sunday, Jun 13, 2004 at 16:45
ThreadID: 13723 Views:9102 Replies:5 FollowUps:0
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Is spending the extra money on a mandrel bent exhaust for a non-turbo deisel landcruiser worth it, or will I get the same gain out of a normally bent two and a half inch system. I have heard you should get a mandrel system for turbo powered deisels, but I am not clear whether there is any real difference between the two when it comes to your stock standard deisel.
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Reply By: Jimbo - Sunday, Jun 13, 2004 at 17:13

Sunday, Jun 13, 2004 at 17:13
Stan,

Mandrel bent means the pipe is bent evenly all along meaning you are getting a constant 2.5 inches. "Cheapy" bent pipes have "corners" where they er bent reducing the diameter. Think of a kink in a rubber hose, it is this type of effect.

Get the mandrel bent.

Jim.
AnswerID: 62993

Reply By: cj - Sunday, Jun 13, 2004 at 18:03

Sunday, Jun 13, 2004 at 18:03
Unless the bends are greater than 90 degrees (real bad) an option to 2.5" with mandrel bends would be to go 3" with normal bends. For your application the real world difference would be negligible, but it's your money.
AnswerID: 62998

Reply By: Truckster (Vic) - Sunday, Jun 13, 2004 at 19:47

Sunday, Jun 13, 2004 at 19:47
I agree with CJ, its your money, but your not chasing .01 of a HP, the difference in Non mandrel and mandrel would be minute for the outlay...
AnswerID: 63011

Reply By: Member - Nick (TAS) - Sunday, Jun 13, 2004 at 21:26

Sunday, Jun 13, 2004 at 21:26
Have heard that Mandrel bends have a habbit of breaking at the bends due to the extra stresses of being drawn out,not bent.Any thoughts?
AnswerID: 63028

Reply By: hoyks - Tuesday, Jun 15, 2004 at 11:42

Tuesday, Jun 15, 2004 at 11:42
There is actually less stress in a mandrel bend although the wall of the pipe on the outside of the bend is thinner. Mandrel bent tube is still bent there is just a big plug up the centre of the pipe while it is being bent to stop the pipe crushing in on it's self.

A standard bend is under more stress, have a look at how many changes in direction are around each bend, crushing, stretching, pinching. Mandrel bending is much nicer to the tube.

For a standard motor where exhaust gas velocity is not as much of an issue, I doubt it would make much difference, especially if you are running the standard exhaust manifold.
AnswerID: 63216

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