question U BEND - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-24-2006, 03:38 PM   #1
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Default question U BEND

What is U bend delete mean.
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Old 05-24-2006, 03:39 PM   #2
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it is only applicable to the W-bodies, they have a sharp U pipe where the O2 sensor sits in the middle, it restricts the exhaust flow very much so they just cut that part out and weld in a straight pipe with a hole for the O2 sensor to sit in.

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Old 05-24-2006, 03:47 PM   #3
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W bodies are Grand Prix'* and such. Not Bonnevilles. We don't have U-bends. Never did.

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Old 05-24-2006, 03:48 PM   #4
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Clear thanks, I knew it had to do with GPs,just didnt know exactly what.
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Old 05-24-2006, 03:49 PM   #5
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Quote:
Originally Posted by willwren
W bodies are Grand Prix'* and such. Not Bonnevilles. We don't have U-bends. Never did.

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Thanks Mr. Wren, I should have mentioned that W bodies was Grand Prixes, and the other "such" are Regals, Monte Carlos, Impalas.
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Old 05-24-2006, 03:59 PM   #6
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That really clears it up.

No other bodies that we are aware of had the U?
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Old 05-25-2006, 02:24 AM   #7
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anyone got a pic? i'd like to go take a quick look at my van (U-body) and see if i've got one...
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Old 05-25-2006, 02:25 AM   #8
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Quote:
On the factory exhaust for your car, GM decided they wanted the O2 Sensor mounted vertically which resulted in what'* been termed the U-Bend. This restrictive section of pipe causes added backpressure resulting in power loss. Modifying your car with a different intake system and/or smaller pulley only makes this restriction worse. Free up this restriction with our U-Bend replacement.
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Old 05-25-2006, 02:53 AM   #9
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Quote:
Originally Posted by fuelforthesoul1999

Thanks Mr. Wren, I should have mentioned that W bodies was Grand Prixes, and the other "such" are Regals, Monte Carlos, Impalas.
*clears throat*

*points to sig*.....you forgot one....you bastard you
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Old 05-25-2006, 04:06 AM   #10
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While we're on the topic, what exactly is the point of the u bend? The only real benefit I can see from it is that it'* a way to protect the o2 sensor, which works great until you bottom out hard and jam it up into the body and break it (which i've personally seen on a BMW 3-series). Is that the reason GM used it?
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