What is the flex section on a y-pipe for?
11-04-2003, 04:14 PM
#2
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Location: San Bruno, CA (SF Bay)
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if the pipe was stiff and solid, you would have a good deal of trouble lining everything up straight enough to bolt it down. Remember that to keep exhaust gasses in, all those bolts and such need to be very tight. so it can definately not be tightened crooked or at an angle, so something needs to be able to move, hence the flex section. Odd its call the flex section because your not supposed to flex it that much.
11-04-2003, 05:15 PM
#7
Originally Posted by SXN
if the pipe was stiff and solid, you would have a good deal of trouble lining everything up straight enough to bolt it down. Remember that to keep exhaust gasses in, all those bolts and such need to be very tight. so it can definately not be tightened crooked or at an angle, so something needs to be able to move, hence the flex section. Odd its call the flex section because your not supposed to flex it that much.
Actually, there is a flex section in the y-pipe not for ease of installation (that's just a side benefit), but because when you're on the gas or WOT, there is quite a bit of movement of the engine/tranny in the engine/tranny mounts on account of the torque generated by the VQ. This movement is transferred to the y-pipe.
The flex section is there to absorb movement and prevent undue stress to the exhaust system and contact interference between the exhaust and other parts of the underbody that would occur if there was no flex section.
(Careful, it's dangerous to think you have the last word on anything around here).
11-04-2003, 05:19 PM
#8
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i never said it was for install only, but wouldnt u agree with my point that the exhaust cant bolt up perfectly straight, and stay perfectly straight without bending or stressing something? thats all i said about that. the engine does torque and move, another purpose of the flex section i did not mention... i didnt say i had the last word unless you are refering to the post about searching. my search brought up absolutly no result about the purpose of the Y pipe flex section...therefore i see no problem with my statement 
11-04-2003, 05:28 PM
#10
Originally Posted by SXN
i never said it was for install only, but wouldnt u agree with my point that the exhaust cant bolt up perfectly straight, and stay perfectly straight without bending or stressing something?:
Originally Posted by SXN
the engine does torque and move, another purpose of the flex section i did not mention...
Cheers,
-K-
11-04-2003, 05:35 PM
#11
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Originally Posted by KWheelzSB
Yes, but that's incidental. It's not the primary design objective.
Not just "another" purpose; the PRIMARY purpose. -As long as we're clear on that, it's all good.
Cheers,
-K-
Not just "another" purpose; the PRIMARY purpose. -As long as we're clear on that, it's all good.
Cheers,
-K-
Originally Posted by SXN
something needs to be able to move, hence the flex section...
11-04-2003, 05:44 PM
#12
Originally Posted by SXN
yea, we are clear on that...look at my first post
i never specified if it was for engine torque or for instalation...just said for the piping to move without buckling etc. Since i didnt discern that, why would i need to state the "primary" purpose?
i never specified if it was for engine torque or for instalation...just said for the piping to move without buckling etc. Since i didnt discern that, why would i need to state the "primary" purpose?
Peace,
-K-
11-04-2003, 09:42 PM
#15
Senior Member
Join Date: Oct 2000
Posts: 1,391
Originally Posted by ManualMaxima
no need to argue over something simple. So do all cars y-pipes have flex section. Would a 300zx have one?
11-06-2003, 08:00 AM
#17
Donating Maxima.org Member
Join Date: Jun 2003
Posts: 384
Originally Posted by KWheelzSB
Actually, there is a flex section in the y-pipe not for ease of installation (that's just a side benefit), but because when you're on the gas or WOT, there is quite a bit of movement of the engine/tranny in the engine/tranny mounts on account of the torque generated by the VQ. This movement is transferred to the y-pipe.
The flex section is there to absorb movement and prevent undue stress to the exhaust system and contact interference between the exhaust and other parts of the underbody that would occur if there was no flex section.
(Careful, it's dangerous to think you have the last word on anything around here).
The flex section is there to absorb movement and prevent undue stress to the exhaust system and contact interference between the exhaust and other parts of the underbody that would occur if there was no flex section.
(Careful, it's dangerous to think you have the last word on anything around here).
SXN why so hash?
11-06-2003, 05:32 PM
#19
Handsome
Join Date: Sep 2002
Posts: 2,074
Originally Posted by KWheelzSB
Actually, there is a flex section in the y-pipe not for ease of installation (that's just a side benefit), but because when you're on the gas or WOT, there is quite a bit of movement
11-06-2003, 05:42 PM
#20
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Location: San Bruno, CA (SF Bay)
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my last car had some sloppy engine mount bushings, and it moved a lot. if the y pipe bumps anything and makes noise, i found wrapping it is the easiest way to take care of it
11-06-2003, 05:58 PM
#21
Handsome
Join Date: Sep 2002
Posts: 2,074
Originally Posted by SXN
my last car had some sloppy engine mount bushings, and it moved a lot. if the y pipe bumps anything and makes noise, i found wrapping it is the easiest way to take care of it
11-06-2003, 06:01 PM
#22
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thanks, like i said, my last cars engine moved a lot, so i already knew about that function of the y pipe... i glazed over that point. i would have done the same probably, if the heat shield is in the way, just easier to bend it out of the way 
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