STUPID QUESTION: what exactly is a breather and whats it for - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-08-2005, 09:27 AM   #1
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Default STUPID QUESTION: what exactly is a breather and whats it for

ive seen breathers replacing the oil cap on cars and ive seen breathers that looked liek they were going into the UIM, so im still not exactly sure whats its for, why would you want air in the oil? and how would oil not clog the breather? and what woudl be the poitn of a breather to the UIM if all the air is goign there anyway?
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Old 07-08-2005, 09:39 AM   #2
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A vavle cover breather replaces the PCV on cars that have a modifacation the disables it, Such as a turbo.

A PCV is needed because some of the combustion energy bypasses the piston and goes down into the crankcase. This air has to go somewhere and the PCV lets it into the UIM.
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Old 07-08-2005, 09:58 AM   #3
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To sum up your question, Breathers do nothing for our cars. Some folks like the looks of having one. And it does kinda give it that "Old School" look. But that'* about it. Purely cosmetic.
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Old 07-08-2005, 10:17 AM   #4
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My car has a smoother idle, regardless of a new PCV. The idle changes noticeably when I remove the breather and re-install the cap, and with the breather, it seems to be slightly better revving.

But otherwise, with a proper working PCV, it'* not SUPPOSED to make a difference.
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Old 07-08-2005, 10:54 AM   #5
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Why did I know Will would jump in and contradict me...
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Old 07-08-2005, 11:01 AM   #6
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Don't get me wrong, I'm not saying there'* really any benefit to it. If I put my cap back on, it takes about 5 minutes for the PCM to re-adapt for idle. And the other way around, too.

SOMETHING is different.
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Old 07-08-2005, 11:01 AM   #7
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Bill: Can you test the effects of breather effects by temporarily pulling the oil cap [of course not driving the car like that]?

-justin
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Old 07-08-2005, 11:06 AM   #8
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Not necessarily. The cap is somewhat restrictive. And I don't really care that much to bother. My cap only breathes through a hole about the same ID as the PCV. Most are like that.
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Old 07-08-2005, 05:41 PM   #9
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Okay.. because I had some free-revving issues, and I noticed my PCV Valve was a little loose. Oh well, a whole list of things could have been wrong, but I think we all know what step one is


-justin
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Old 07-08-2005, 07:21 PM   #10
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Quote:
Originally Posted by opensourceguy
Okay.. because I had some free-revving issues, and I noticed my PCV Valve was a little loose. Oh well, a whole list of things could have been wrong, but I think we all know what step one is


-justin
Step 1: Do it again, asking for advice and help to ensure you do it right and don't have to take it apart again.

We are here to help out. Please, ask the questions.
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