breather system

[Nadine UK GTS]

I have tapped larger breathers into the top of my valve covers and blanked off the OE cover breathers (that puke oil). My 37K mile '97 Coupe has quite a bit of blow-by. I no longer have the block breather / PCV valve with the Supercharger application. I know I need PCV to pass emissions but this is not an issue for me at the moment! I am making a collection bottle (with oil separator) for the new valve cover breathers, and notice that there is a little fine oil mist that's vented, but the main vent product is a caramel-color clear fluid (probably quite acidic!). I read the posts a while back with interest on fitting in-line PCV valves to the breathers (a quality Harley type application was used). What I am wondering is what does the GenII engine favour? Whether or not to just put a small K&N filter breather on my collection bottle, or to put a vacuumed line to the collection bottle, and connect this before the TBs (I have cone type filters and 3" metal tubes). I think if I connect into the port on the SC intake tubes after the TBs, it will give big fluctuations in vacuum pressures with closed / open TBs that may not be in correlation with when the breathers need vent vacuum assistance? If I do tap the breathers back into the air intake making more a closed system, it may help to draw all moisture from the engine (since venting openly through a filter I have noticed the top of my dip-stick starting to make a little rust).

Any comments, knowledge or experience would be gratefully read, so I can be happy I'm doing the best breather system for my engine! Thanks

 

[Jerome Sparich]

Nadine here is the link for the Krank Vents. These are the ones used on HD's and such.

http://www.krankvent.com

They are just really heavy duty pcv valves but do the trick. A lot of turbo cars, like my VR4, run them.

I am not sure where to install them on your car but it should not be hard to figure out.

 

[Daffy Duck Viper]

I'm trying to understand this, but I'm not. In what case is such a thing needed on a Viper? Would all Vipers benefit from this? Do the newer Vipers have technology that makes this obsolete? Just trying to understand something new.

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[HP]

The Krank-vent is a machined, one way piston device - that does the job of
a PVC valve AND - if you close up all other crank case openings - will
save negative engine pulses(vacuum pulses) to help negate positive crankcase
pressure. It originated for big V-twin motors - that are notorious for
crank pressure problems - because of small crankcase air volume and 2 large pistons
creating huge crankcase pressure pulses - both negative and positive.
So someone thought of instead of venting all the pulses - they would vent the
positive and save the negative - to even out the crankcase pressure problem.
The idea caught on with forced induction setups - because the valves are
better sealing than a regular PVC valve - therefore holding back the higher positive intake pressure seen with S/C applications.

 

[Daffy Duck Viper]

That helps my understand a lot more. Thanks.
Is this only needed on a Viper in cases where it's supercharged?
Do the superchargers come with this type of thing built into them?
I know, I know, but please, I'm trying to understand. Bear with me. lol

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[HP]

I think Sean has a list of options to handle the situation - it's not
as if there is one product or one solution.

 

[1TONY1]

You don't want to tap into the tubes after the throttle bodies. It must be ahead of them. I have one k&n style breather in my oil fill hole but it stinks. I will be doing something like you are talking about with the catch can. Look at jegs or summit, they have some that will work. I might try a can with the breather on top and then the breather covered with a hose to the breather box.

 

[HP]

There is a crankcase evacuation system in the JEGs catalogue that uses a
18mm exhaust ****(same as O2 sensor) - it includes a screw in piece for the
exhaust **** - from there you plumb a vacuum line to the valve cover.
I don't have any knowledge of results - I just know it is listed - $16.99.
called 'Pan E-Vac kit' by Dynatech