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- Hemi Ram, 71 Plymth Scamp, 71 Plymth Duster 340, 69 Dart 340/4sp
It can and will cause idle issues and can even cause lean condition.
What is this hose for?
- Thread starter TenaciousB
- Start date
are you guys confused? it shouldn't cause idle issues, and I don't see HOW it could cause lean issues. Its an EMISSIONS issue... to pass emissions, you'd need to completely burn oil that recirculates thru the stock tube. If you put a breather there, you are simply allowing those fumes/oil particles to vent, increasing emissions. Its only for emissions.
There is ZERO change in idle and ZERO change in fuel if you change from a tube to a breather if your engine is in fine running condition.
There is ZERO change in idle and ZERO change in fuel if you change from a tube to a breather if your engine is in fine running condition.
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- 92 & 16 Meyatas
this is my kinda thread....more info please...? there seem to be some many pro's and con's???(uhm)
dirtysouth_msp
Member
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- 2003.5 Blazing Yellow MSP (Forged)
BLKZoomZoom can you comment on how it can cause these issues. I am curious and you've always given me straight answers.
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- Hemi Ram, 71 Plymth Scamp, 71 Plymth Duster 340, 69 Dart 340/4sp
It's pretty simple concept. I have seen it cause idle issues and I have personally witnessed the leaning ability it has.
What else is on the Valve cover other than the crankcase breather tube? The pcv. What is the pcv connected too? The Intake Manifold. If you open up the crankcase breather to the atmosphere you are in affect creating a vacuum leak through the pcv into the intake manifold.
The system was designed around the crankcase getting air already metered by the Maf sensor. With the crankcase breather vented to the atmosphere you are introducing un-metered air into the intake manifold. On some cars it won't make as much as a difference as others, but it doesn't change the fact that it is.
If you really want to see its affects get a V6 Passat and pull the oil cap off while its running, it will start to misfire.
What else is on the Valve cover other than the crankcase breather tube? The pcv. What is the pcv connected too? The Intake Manifold. If you open up the crankcase breather to the atmosphere you are in affect creating a vacuum leak through the pcv into the intake manifold.
The system was designed around the crankcase getting air already metered by the Maf sensor. With the crankcase breather vented to the atmosphere you are introducing un-metered air into the intake manifold. On some cars it won't make as much as a difference as others, but it doesn't change the fact that it is.
If you really want to see its affects get a V6 Passat and pull the oil cap off while its running, it will start to misfire.
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- 92 & 16 Meyatas
on my mam sleeper there is no provision for the breather tube/hose to the intake? i've got the filter on there?
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- Hemi Ram, 71 Plymth Scamp, 71 Plymth Duster 340, 69 Dart 340/4sp
Are you asking me? lol.
does this help explain?
Also, Blk I fail to understand your lean issue. A breather does not allow air IN to the engine. The PCV system (duh) is crankcase VENTILATION not crankcase air supply. the air/oil is LEAVING the engine. The only reason OEM recirculates it is because no vehicle would be certified for emissions if it was blowing oil oil out of the motor... make sense? so having a breather vents the oily smoke out to the air instead of reinjecting it into the air stream for a complete burn
Also, Blk I fail to understand your lean issue. A breather does not allow air IN to the engine. The PCV system (duh) is crankcase VENTILATION not crankcase air supply. the air/oil is LEAVING the engine. The only reason OEM recirculates it is because no vehicle would be certified for emissions if it was blowing oil oil out of the motor... make sense? so having a breather vents the oily smoke out to the air instead of reinjecting it into the air stream for a complete burn
Attachments
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- Hemi Ram, 71 Plymth Scamp, 71 Plymth Duster 340, 69 Dart 340/4sp
safariMP3 said:
Start your car up and pull the tube off. Tell me if it is blowing out or sucking in.
Why is taking the oil cap off different than throwing a filter over a hole?
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- Hemi Ram, 71 Plymth Scamp, 71 Plymth Duster 340, 69 Dart 340/4sp
safariMP3 said:
The breather does allow air into the engine. The pcv is hooked up to the strongest vacuum source in the engine. Air will take the path of least resistance and instead of the pcv taking the air from the crankcase it instead will suck it through the breather.
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- Hemi Ram, 71 Plymth Scamp, 71 Plymth Duster 340, 69 Dart 340/4sp
It gets sucked into the intake manifold. Thus adding un-metered air into the engine and possibly causing idle and lean(er) conditions.
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- Hemi Ram, 71 Plymth Scamp, 71 Plymth Duster 340, 69 Dart 340/4sp
zverg said:
huh?
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- Hemi Ram, 71 Plymth Scamp, 71 Plymth Duster 340, 69 Dart 340/4sp
The baffles are so that oil doesn't get sucked up.
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- Hemi Ram, 71 Plymth Scamp, 71 Plymth Duster 340, 69 Dart 340/4sp
I bet your pcm did.
during extremely high load, if the volume of blow by exceeds the ability of the PCV valve to draw in vapors, the excess blow by flows THRU the breather hose to the combustion chamber OR BREATHER. If using a breather, the excess blow by simply vents to the atmosphere. the pintle in the PCV controls air that enters the crankcase. only a small volume is pulled in if using a breather, not usually causing vacuumm concerns due to various check valves in place.
