ucleadguitar

iTrader: (1)

What's ghetto about a Breather instead of the return line to the intake?

mikeschaefer

I've used them before and they don't catch as much as you'd like. That's if there's even enough pressure in the crankcase (and most think there isn't) to push oily vapor out. If that's the case then it's still useless.

mysql101

I did both...

oil catch can, with a breather on the end of it.

My catch can is about half way full right now, need to dump it soon.

dgrx8

do u happen to have a picture of your setup??

mysql101

I'll snap some new photos tonight - if I don't forget.

CURED RX8

mysql101...Love the Lord of the Rings reference.

See this from another thred on Oil Catch Cans:

http://www.finishlineperformance.co...050-06-1664.pdf

If you prefer, you can get the new '06 setup done at the dealership. No need for the Oil Catch Can.

Edit: I don't think the link is working, I'll try and find the thread again!

mikeschaefer

So they use lower intake manifold vacuum to pull the oily vapors in, much more close to the combustion chambers. If I had to make an educated guess, you probably wouldn't want this done if your car is boosted.

mysql101

As promised..

The breather is dry, so it looks like the catch can is working extremely well.

sosonic

I'm thinking about doing this mod. The above pics, by mysql101, are nice.

But I have a problem deciding to go with the catch can and breather, in-line filter, or the 06 Mazda mod where the return line routes to the lower intake manifold.

With the catch can and breather I'm confused about the vacuum pressure issue. It appears that some people are saying that no oil vapors actually make it to the catch can and breather. Is the filter on the breather good enough to protect you and the inside of the engine compartment from oil vapors? Is that really safe?

Even if that is the case, it appears that no oil vapors and weird condensed gunk are getting into the intake. That means only fresh air into the intake? So, it would appear that means better performance?

With the 06 Mazda mod, the oil vapors route to the lower intake manifold. I understand that this would bypass having gunk condensing in the air intake. But you are still mixing "dirty air" with fresh air. So, would this not still be limiting your performance?

Also, is it me or is there a flaw in the 06 Mazda mod? I would think that before you run the oil vapors into the lower intake manifold or even the air intake that you should have a filter to out "dirty air and vapors". In the Mazda mod, it seems that a filter to "clean the air/vapors" would make sense, so that you have cleaner air and higher performance.

So, would it not be better to simply put a filter on the return line, regardless if it goes to the air intake or lower intake manifold? This of course is what the "catch can" concept is partially about, but is a brillo pad a truly effective filter? Would an effective filter not be better than a "catch can"?

In other words would not a good in-line filter (that is a good oil from air separtor) on the return line between the air intake or lower intake manifold be the "end all" to "dirty air", "oil vapors", and condensed gunk.

If so, than what is the best type of in-line filter?

I'm interested in which options people think is better to do.

dgrx8

regardles... u'd still have hot nasty oil vapor entering the intake manifold.
i've had just a breather attached for months now & i have not noticed any oil vapor sludge anywhere in my engine bay. the only thing is... i'm starting to wonder if all the vapors are causing building in the oil system. the only problem w/ the crankcase breather as mentioned on all the threads here... is the doubt of insufficient ventilation due to not providing any vacuum...

rotarygod

It doesn't need to have any vacuum. Your goal isn't to try to pull any oil out. What gets out on it's own is fine. We don't need a vacuum as we don't have a crank spinning in this space so that won't help us. You only need to catch what does come out. The factor runs it back to vacuum in the intake manifold to burn it. It's all about emissions and simplicity.

dannobre

iTrader: (3)

I think the idea is to "vacuum" out the water vapor and oil vapor from low temp operation...esp in colder humid climates like Seattle.....Then the water vapor won't condense with the oil vapor into the gunk that I had in my oil inlet piping

theboy

i got grease or oil in my Air intake tube as well. other than this modification any other method?