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Old 10-30-2007, 11:16 PM   #1
MooZX3
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Breather filter.

So I've seen a few of these around. I know that from the factory the breather tube runs into the airbox. But I always seem to get some amount though slight oil in my filter.
But there is a type of cone filter that you can just put right up to where the breather tube connects to the engine.
Doesn't this create heat soak?
Although from the times I've paid attention it doesn't seem as though the thing really moves any significant amount of air.
So what's the opinion on these?

If so I would like to just put that cone filter on. And run another Ice-Man clone to the Airbox.


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Old 10-31-2007, 10:54 PM   #2
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22 views, and no one knows or has ANY ideas on this?
I just thought using the second hole in the air box would give me a chance to make more air available to the TB and such.....
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Old 10-31-2007, 11:00 PM   #3
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There was a post somewhere around here... I tried looking for it before and couldn't find it. Someone had attached a cone filter directly to the MAF of the stock zetec and then added a little breather filter. I've read up on it, well mostly google'd, and it looks like it doesn't really do anything for performance. I'm going to try it just for the fun of it once I'm done with my intake plans.
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Old 10-31-2007, 11:17 PM   #4
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If you are talking about an aftermarket filter for the crankcase breather there are at least a couple things to keep in mind: 1) if the filter gets wetted out with oil it will increase the resistance to gas flow. In some other forced induction engines this has lead to increased windage effects to the extent that the oil light was triggered; 2) related to 1, a catch can should be used prior to the filter.


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There was a post somewhere around here... I tried looking for it before and couldn't find it. Someone had attached a cone filter directly to the MAF of the stock zetec and then added a little breather filter. I've read up on it, well mostly google'd, and it looks like it doesn't really do anything for performance. I'm going to try it just for the fun of it once I'm done with my intake plans.
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Old 10-31-2007, 11:20 PM   #5
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Yeah, I'm not real sure about that. And the whole MAF thing.
I just wanted to know if adding a small breather straight to the crankcase as you said would cause adverse effects, in any effects at all.
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Old 10-31-2007, 11:25 PM   #6
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Yeah, I'm not real sure about that. And the whole MAF thing.
I just wanted to know if adding a small breather straight to the crankcase as you said would cause adverse effects, in any effects at all.

If you want to do something to increase the performance, add a metered vacuum valve to that opening and draw vacuum from another area on the engine. Keep the depression to about 10". You need the filter in that reverse flow app to avoid drawing in dirty air to the engine.

Of course, this is all emissions illegal. In older engines what was called a draft tube was run down the side of the block. I have a 1960s Triumph straight six block with one sitting here.
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Old 10-31-2007, 11:27 PM   #7
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^great posts, might even be rep worthy...

anyway, you will not get heat soak from a 3/8" diameter hole...
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Old 10-31-2007, 11:40 PM   #8
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I'll 2nd that. Makes sense, but where would do I get that kind of valve? And where would I draw vacuum?
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Old 10-31-2007, 11:44 PM   #9
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well it depends how much vac you need, but if it was up to me I would splice into the brake booster.
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Old 10-31-2007, 11:55 PM   #10
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which, is....where? Wow..haha mabey this is something I shouldn't attempt myself. This seems like a more "experienced" type job.
What type of benefits would this yield performance wise??


**edit: I guess I takes awhile for REP to show up? That or I screwed it up...
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