Oil catch can vs breather vs breather catch can
Oil catch can vs breather vs breather catch can
I saw a nice looking breather catch can for the mini-cooper and it started me thinking. Which of the 3 was really better and why? Oil catch can, breather, or breather catch can. Case of each: 1. The oil catch can http://us.st11.yimg.com/us.st.yimg.c...1985_510397141 The theory for this is that intake vacuum sucks in oil vapors and oil into the catch can. The catch can helps condense a lot of the oil, but vapors and gases may still enter the intake. This method would reduce the problem but not totally eliminate it. Some oil vapors would still make it back into the intake. Note- a good oil catch can would have baffles to help condense the oil and bad ones would not. For the types without baffles you would need to put some type of steel wool/brillo inside for the purpose. Baffle or no, some oil vapor would get past. 2. The breather or inline oil catch can and breather https://www.rx8club.com/attachment.p...1&d=1166998323 Usually is done inline and perhaps with a small catch can in front of it. This would prevent any oil or oil vapor from getting into the intake, but the problem is vacuum necessary for "blow back" oil coming from the oil filler pipe? Other issues are using too small of an inline catch can and too much oil get into it. The other problem is excessive oil vapor being vented by the breather. 3. Breather catch can http://new.minimania.com/images/articles/nme4512.jpg This seems to be the best of both worlds. It will help condense larger oil vapor, oily gasses would be expelled by the breather, and all this would be done with the aid of vacuum pressure from the intake. In theory, the breather catch can would have "cleaned" the air going into the intake so that very little vapor would be there. However what do you guys think about number 3? Note: Oil Catch Can of any type is not required for Series II's 2009-2012. |
unless there is a check valve in that breather, #3 looks like a giant vacuum leak
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I'm looking into this about the check valve. I see what you mean, suction from the intake could cause a "reverse flow" from the small air filter thus a giant vacuum leak.
The breather catch can would have to be constructed to allow only flow from the oil filler piper > to catch can > to breather or to intake. The breather/filter should only "exhale"/push out vapor and never inhale/suck air or it is worthless. |
No vacuum leak.
The catch can is vented pre-MAF on a recirculating setup. If you just do a vented can (like most people), you are just ventilating the "crankcase", which isn't under vacuum to begin with. Because of the way the Renesis ventilates, you don't need anything more. You just want to catch the oily water vapor that boils out of the pan. |
You only need an oil catch can or breather if you drive an 04 or 05.
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Originally Posted by Renesis SE3P
(Post 2299241)
You only need an oil catch can or breather if you drive an 04 or 05.
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Originally Posted by MazdaManiac
(Post 2299386)
Right, because if you drive an '06 or later (or have had the TSB countermeasure installed), the crap from your crankcase goes directly into the upper intake manifold and sh*ts on your motor more completely.:jerkit:
I have a catch can and breather. But, the idea of a breather catch can is intriguing. If it works, seems like it might have been the way to go. |
Originally Posted by MazdaManiac
(Post 2299386)
Right, because if you drive an '06 or later (or have had the TSB countermeasure installed), the crap from your crankcase goes directly into the upper intake manifold and sh*ts on your motor more completely.:jerkit:
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Don't need the can just a filter and a plug into the intake.
Check the DIY section. |
Originally Posted by Razz1
(Post 2302187)
Don't need the can just a filter and a plug into the intake.
Check the DIY section. |
MM, what's your catch can/breather setup? Any pics? Suggestions?
I'm really considering doing this, especially because the other day I had a BIG oil blowback/overflow issue into my intake. It happened (I think) when I accelerated briskly up to about 7000-7500 rpm and held it there for a few seconds. I went to check my oil level after I got home and found oil had blown all over the place, and was running down my intake tube and out the filter (K&N v.2 intake). The weird part was that my oil level was barely at the full mark-not overfilled at all.:dunno: |
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I have a breather on the end of my catch can too. It's been this way for a long time, there haven't been any issues with the engine bay getting dirty.
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MM, is your catch can vented and running only from the oil filler neck?
would you suggest this method or having a sealed can running from both intake and oil filler neck? |
Originally Posted by MazdaManiac
(Post 2302474)
Only if you want an oily little filter dripping on your alternator.
You can alwayes get a longer hose or an extension to make it hang down the side of the engine. :beer05: |
I've been reading up and doing alot of research on oil catch cans and I believe that running it back into the intake would be the best choice.
Reason: The catch can will catch all the oil but the oil fumes will go back into the intake and can also grease up parts the throttle body. It has other advantages as well... mostly serve as lubrication though. Hell, it might be good for our apex seals as well! |
Originally Posted by Renesis SE3P
(Post 2316747)
The catch can will catch all the oil but the oil fumes will go back into the intake and can also grease up parts the throttle body.
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I'm talking about catching the blow back oil itself, not the fumes.
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You don't want ANY of that going through your intake.
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Originally Posted by Razz1
(Post 2316725)
Depends upon where and how you mount it.
You can alwayes get a loner hose or an extension to make it hang down the side of the engine. :beer05: |
Originally Posted by mysql
(Post 2317079)
I actually did that once. The result isn't as you'd expect. As oil drips, the air passing under the car pushes the oil up and you end up with the bottom of your car slick with oil. Not really the best solution.
I actuality mine has barley turned color in over a year. Of cource I only put on about 4k miles, it has seen several track days. It's not like oil gushes out of the fill pipe into the intake. |
Originally Posted by Razz1
(Post 2317199)
It's not like oil gushes out of the fill pipe into the intake.
I've looked at a few catch cans online (ebay, etc.) and I can't find one that has a breather on it, like MM's. Anybody know where to find one, hopefully for a decent price? |
you don't buy a catch can with a breather.
you buy a catch can, and instead of connecting one end to the intake, you buy a breather filter at your local auto store and install that instead. |
The Mazsport Oil Catch Tank doesn't have a breather "nipple/port" on it. I never asked why.
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Originally Posted by mysql
(Post 2317675)
you don't buy a catch can with a breather.
you buy a catch can, and instead of connecting one end to the intake, you buy a breather filter at your local auto store and install that instead. |
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