ATTN: everyone who has a fliter on the valve cover breather - Miata Turbo Forum - Boost cars, acquire cats.

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Old 12-04-2007, 05:04 PM   #1
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Default ATTN: everyone who has a fliter on the valve cover breather

PLUG IT INTO THE INTAKE! I know many people here have said this before, but trust me, IT IMPROVES YOUR IDLE AND LEAN IDLEING/VAC LEAKS. It was an amazing difference when I acually connected it. So do it! now!
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Old 12-04-2007, 05:09 PM   #2
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Originally Posted by cardriverx View Post
PLUG IT INTO THE INTAKE WITH A PROPER BAFFLED CATCH CAN IN BETWEEN! I know many people here have said this before, but trust me, IT IMPROVES YOUR IDLE AND LEAN IDLEING/VAC LEAKS. It was an amazing difference when I acually connected it. So do it! now!
I added something..
That is the truth though.
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Old 12-04-2007, 05:09 PM   #3
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How the hell could that affect your idle and vac leaks? The cam cover has nothing to do with your intake or vacuum leaks. Unless you have a bad PCV, then maybe something strange could be leaking that way.
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Old 12-04-2007, 05:24 PM   #4
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The breather was only added to cars for emissions reasons. The only thing its gonna do is pull some vac at idle. I'd much rather tune my idle with ms and have my breather vented to atmo with a catchcan though. Under boost thats the only way you are gonna remove crank case pressure quick enough. I'f you live in an area that has emissions checks though....thats not an option for you (once a year that is :P)
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Old 12-04-2007, 05:34 PM   #5
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I have a feeling your PCV valve is toast. it shouldn't effect anything but the oil drain.
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Old 12-04-2007, 05:52 PM   #6
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I have a feeling your PCV valve is toast. it shouldn't effect anything but the oil drain.
well, you made my day better as in it is not the rings now. So.. ignore this thread
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Old 12-04-2007, 06:00 PM   #7
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I'm not a fan of the PCV systems anymore to be honest. They were primarily an emissions thing.

I run a turbo honda with just a vented catchcan... no issues. This is along with many others I know with turbo cars.

I know people will argue with me over that, with regards to getting some vac during cruising and with the proper pcv, nothing during boost. But honestly.. that system then blocks venting during boost... which i do NOT like at all.

My ideal setup would be a catchcan and an old gmc electric vacuum pump pulling vacuum from the motor at all times. I just haven't found a good deal at the junkyards for one yet.
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Old 12-04-2007, 06:09 PM   #8
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I'm not a fan of the PCV systems anymore to be honest. They were primarily an emissions thing.

I run a turbo honda with just a vented catchcan... no issues. This is along with many others I know with turbo cars.

I know people will argue with me over that, with regards to getting some vac during cruising and with the proper pcv, nothing during boost. But honestly.. that system then blocks venting during boost... which i do NOT like at all.

My ideal setup would be a catchcan and an old gmc electric vacuum pump pulling vacuum from the motor at all times. I just haven't found a good deal at the junkyards for one yet.
That's what I'm doing for my SC setup. I'll have a old vacuum pump or two, one just for the SC (for proper oil control, long story) and one for the motor. Don't know exactly how I'd set it up yet though I have a few ideas.
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Old 12-04-2007, 06:11 PM   #9
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To avoid the leavy PCV issue and yet still have some negative pressure on the crankcase, I wonder what the effect would be of plugging the PCV ports and simply connecting the left side port to the intake between filter and compressor inlet? Granted, assuming the air filter is in reasonably decent condition it won't pull much vacuum, but it should at least be better than the little vent filter I've got on there now...

Note to self - buy a fitting and re-connect that line.
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Old 12-04-2007, 06:18 PM   #10
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To avoid the leavy PCV issue and yet still have some negative pressure on the crankcase, I wonder what the effect would be of plugging the PCV ports and simply connecting the left side port to the intake between filter and compressor inlet? Granted, assuming the air filter is in reasonably decent condition it won't pull much vacuum, but it should at least be better than the little vent filter I've got on there now...

Note to self - buy a fitting and re-connect that line.
This is what Ford did on a lot of their trucks in the late 80's, early 90's. There was a hose that went from the valve cover to the air intake box, right before the airfilter. It causes the filter to get soaked in oil, and after many miles of neglect, the filter will fall apart from the oil.
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Old 12-04-2007, 06:29 PM   #11
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It causes the filter to get soaked in oil, and after many miles of neglect, the filter will fall apart from the oil.
Well, my K&N is already soaked in oil, but I'm suggesting the return line be put after the filter, before the turbo. Functionally equivilant to how the stock setup was.
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Old 12-04-2007, 06:38 PM   #12
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I'm going to do what the honda boys do. route both the lines to a catch can that's vented to the atmosphere.
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Old 12-04-2007, 06:43 PM   #13
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I have both lines routed to a breather right now. It needs a catchcan though as the spot it's routed to stays oily. I personally don't want oil going into my intake manifold, or exhaust gases for that matter.

Joe, if you do that, just don't put it too close to the filter, or the oil will probably get on the filter anyway.
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Old 12-04-2007, 06:57 PM   #14
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Blah blah blah, VTA FTW. Doesn't smoke, stink, or consume a drop of oil. (PCV is still in place on the intake side)
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Old 12-05-2007, 12:46 AM   #15
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i'll eventually run mine pre-turbo just to get the vapor out of the crank case and prolong my engine life ever so slightly.
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Old 12-05-2007, 12:56 AM   #16
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Quote:
Originally Posted by Joe Perez View Post
Well, my K&N is already soaked in oil, but I'm suggesting the return line be put after the filter, before the turbo. Functionally equivilant to how the stock setup was.
Terrible idea. Then every *single* time you lose a lifter or a main bearing, you're just going to suck that into your turbo and have to get it rebuilt.

It's where I have mine plummed. Don't see how it hurts anything, though a catchcan to keep oil out of the intake might be nice.
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Old 12-05-2007, 10:55 AM   #17
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Why would it really matter if the breather is connected between the filter and the turbo? Its just a source of fresh air for the crank case isnt it? As long as its clean, it should be fine.

As for the PCV. I am guessing some of you recommend a catch can because the additional boost causes more oil to be pushed out of the PCV during vacuum conditions?
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Old 12-05-2007, 11:10 AM   #18
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Terrible idea. Then every *single* time you lose a lifter or a main bearing, you're just going to suck that into your turbo and have to get it rebuilt.
That makes no since at all...
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Old 12-05-2007, 11:41 AM   #19
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i am really trying to read all this and take it all in and learn from it, but i have to admit, i am more confeused now...

it is my understanding that the breather side of the PCV system is just a source of fresh air that is supposed to circulate through the crank case and help absorb the vaporous gases and move them along towards the intake manifold/vacuum source to relieve the crank case pressure caused by these gases
so why does it matter where the fresh air is coming from?
as long as the PCV valve is functioning properly, you should not have any problems, right?
if i am understanding this wrong, someone please point it out to me, i will not get offended!
thanks
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Old 12-05-2007, 11:46 AM   #20
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^ I am right there with you.

I think the only reason people use catch cans on the PCV side is the increased likelyhood of blow by because of the extra boost. No one wants the interior of their manifolds coated in oil as well every vacuum hose.
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