A friend of mine saw I had a k&n breather on my valve cover instead of a oil catch can. He told me that I should run a catch can instead of a breather because everycar that they had go through there shop with a breather blew out the oil seals, front, rear, cam oil seals etc. Said it has something to do with the crank case pressure and that its better to run a catch can instead. Is this true??? My buschur intake doesn't have a fitting for the catch can line to hook up, so thats why I ran the breather, but I'll just tap a fitting on there if this is the case.

 

im running just a breather filter on the valve cover as well... I just popped it on today, was wondering if its safe or not.. A friend said that its safe and won't do any farm 8-x Can sombody give me more info please

 

No it will not hurt anything. Think about it, stock the valve cover goes directly to the intake pipe......... so stock it's going to be under vacuum. With a breather it will be only subjected to atmospheric pressure which won't effect your seals.

 

I dont think its gonna blown oil seals, but every once a while just gonna make a big mass like engine oil all over around breather filter or something..
Im running a catch tank also just with a hose under the car.

 

been running one for almost 2 years no worrys here

 

ok cool, thanks!

 

There is a reason why mitsubishi designed the breather to be under a constant slight vacuum. My buddy moto17 had a 2.3 built by jackson auto machine and they told him to keep the line hook up to the intake pipe. He told me the reason but i forgot:P
Will call him and post back.

 

I dont think that Buschur would design an intake pipe without a return ritting for the crankcase line if it needed to be hooked up. Also they wouldnt be selling the breather filter ifit would cause harm to the motor......

You will be fine...

 

it does need to be hooked up. IT creates vacume to pull moistrure, and oil residue. It works in conjuction with the pcv. By putting the breather on you dont have that vacume, and it can eventually blow out seals, because the pressure built up has no where to go with out the suction of the intake.

 

???? Under normal part throttle driving conditions, the intake manifold is under vacuum and is the vacuum source to vent the valve cover/crankcase. Filtered air is pulled from your intake pipe, through your valve cover and into the intake manifold. It takes oil vapor, blowby gasses (including water) etc. from the head/crankcase areas and sucks them into the intake manifold where they have another chance of getting out the tailpipe. The blowby gasses that are being sucked out are replaced by fresh air coming from you intake pipe. Under wide open throttle conditions when the intake manifold is under boost pressure, the crankcase will no longer vent to the intake manifold, but it will still have a clear path to vent back to your intake pipe, and eventually through your turbo. The purpose of the catch can is to catch any oil droplets that come out and keep them from coating up your turbo and intercooler. If you simply put a breather on the valve cover, the only negatives will be that you could oil saturate the breather and it could drip oil in your engine compartment, and the blowby gasses will stink. But you'll only smell them when under boost pressure, and you'll be moving at a good enough clip that enough air is getting in the engine bay that you'll probably never notice. The crankcase will still vent, and you will NOT blow any seals from this.

 

I've been running a breather for over a year w/ no issues and no residue has come out of the filter. You'll be fine

 

IT does matter, I have friend who worked at a performance shop, and has seen the effects first hand, one car being an evo.

read this thread for more detailed info about it.

https://www.evolutionm.net/forums/sh...d.php?t=200793

 

The PCV Valve is what governs the vacuum to the crankcase, the vent side is just that, a Vent..


The breather's only purpose is to have an escape for excess blowby gases under boost, which is normally recirculated to the intake for two reasons, one to avoid an oily mess on the engine, and two, Emissions..

Putting a breather on in place of the fitting to the intake pipe is technically Illegal since you are fiddling with an emissions device, but it has no other effects other than to possibly spit a bit of oil vapor into the engine compartment.

If you have the fitting on your intake, keep it on there, if not, the breather trick works but may not pass a visual inspection in your state..

Most people don't install catch cans correctly, but if you must use one do the research on the correct way to install it.

 

That thread is unrelated to the question.. That thread only discusses if you intend to use a catch can, that you need to understand how it works and why...

The Ill effects are blowby gases in engine compartment and a bit of oil.. The only purpose of the hose to the intake is to ingest the blowby gases and oil vapor and burn it in the engine to reduce hydrocarbon emissions.. Thats all..

IF you blow seals, leaky gaskets, pop out your dipstick, etc.. then you have to look at the PCV valve or excessive blowby causing more crankcase pressure than both the PCV Valve and Vent tube can handle.. PERIOD..

 

I was just contemplating a thread similar to this nature. BAM! The wonderful things you'd find by doing a simple search. I swear, you guys are like psychics or something.

A K&N breather filter purchase will be deducted in the next few days!