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Re: Flex Pipe Question
[Re: vadartlover]
#2793475
07/06/20 03:09 PM
07/06/20 03:09 PM
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Joined: May 2019
Posts: 6,267 nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,267
nowhere
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Depends on what pipe you actually are looking at. I know of two styles and they are bendable to some extent. Neither are real good for smooth flow, imo. Dynomax 46975 for example, spiral wound steel tube basically. Bellows style, all one piece.
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Re: Flex Pipe Question
[Re: Sniper]
#2793493
07/06/20 03:51 PM
07/06/20 03:51 PM
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Joined: Aug 2011
Posts: 2,861 Pattison Texas
CSK
master
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master
Joined: Aug 2011
Posts: 2,861
Pattison Texas
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I have seen these on turbo set ups
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: Flex Pipe Question
[Re: CSK]
#2793511
07/06/20 04:18 PM
07/06/20 04:18 PM
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Joined: Oct 2006
Posts: 7,368 Iowa
burdar
Owen's Dad
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Owen's Dad
Joined: Oct 2006
Posts: 7,368
Iowa
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I have seen these on turbo set ups Those braided style flex couplers come OE on a lot of FWD cars. They usually use it between the manifold and the rest of the exhaust. Since those engines are transverse mounted, the exhaust has to absorb some fore/aft movement. A solid pipe won't work in that situation. I can remember back in the late 90's when a car came into the shop with a bad flex coupler like that. We replaced it with another flex coupler. A few months later, the car was back with an exhaust leak. The new coupler was bad. Turns out that the car had a bad engine mount and there was excessive fore/aft movement which took out the coupler.
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Re: Flex Pipe Question
[Re: burdar]
#2793523
07/06/20 04:59 PM
07/06/20 04:59 PM
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Joined: Nov 2007
Posts: 21,825 Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,825
Kirkland, Washington
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Some short sections were OEM on new Kenworth’ up at the turbo area for the same reason—engine movement.
Don’t like seeing that stuff on vintage muscle though.
Last edited by Pacnorthcuda; 07/06/20 05:00 PM.
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Re: Flex Pipe Question
[Re: Sniper]
#2794054
07/07/20 08:09 PM
07/07/20 08:09 PM
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Joined: Jan 2003
Posts: 15,383 Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,383
Omaha Ne
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Depends on what pipe you actually are looking at. I know of two styles and they are bendable to some extent. Neither are real good for smooth flow, imo. Dynomax 46975 for example, spiral wound steel tube basically. We used that stuff back in the early 70's when a properly done exhaust was not in the budget. It would last a couple of months and then unravel LOL.
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Re: Flex Pipe Question
[Re: poorboy]
#2794220
07/08/20 09:55 AM
07/08/20 09:55 AM
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Joined: May 2019
Posts: 6,267 nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,267
nowhere
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Any flex tubing for exhaust I've seen usually has a pretty short life expectancy. That is the truth right there. I only used it once when I swapped a 360 in place of the 225 in my Dart and I needed to save up for a dual exhaust. Used the donor car's Y pipe and in the trunk of the donor was a new muffler and piece of flex tubing. Lasted till the next payday and in it went for duals.
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