I'm thinking of ditching my breathers due to the mess and smell and go with a crankcase evac system like this: http://store.summitracing.com/partde...5&autoview=sku I just bought a set of used Dynatech long tubes and while there out getting coated I'll have the probes welded into the mids downstream of the front O2's. If I don't like it I can always cap off the threaded probes and go back to a breather setup. Hit me hard with some input boys.

 

My only concern would be. Will the oil saturation foul 02s and wideband sensors? I would think this method would be bad for our trucks upstream 02s and such. Maybe not initially, but I dont think the sensors are supposed to act as a pcv alternate.

 

I would consider putting them after the cats to avoid potential issues with fouling o2 sensors and clogging with unburnt oil residue.

This could create an issue of oil pooling in the muffler and exhaust system, but I guess it's better there than in the intake. It's probably a non-issue anyway.

 

I will be running catless mids and not using the rear o2's. Also, like stated above, the probes will be downstream of the front o2's. I think it will be fine. Anybody else?

 

That said, IMO your idea is probably one of the best if not THE best solutiont to the dreaded crankcase vent problems. I never liked the seperator mod, as for me I'm running the 3 breather pcv delete approach. It works for me but now with this idea I may be switching up. Let us know how it goes and good luck.

 

Ive been thinking of doing this to, also been considering this from the vette guy's http://forums.corvetteforum.com/show....php?t=1450082

 

I would stay with the three breathers to let the crankcase breath and fix the problem you have with the smell when your A/C is on or the vent.

The smell is strong but it can be eliminated. As for "the mess" I have not experienced an oil mess.

My solution was to use hose from the cam covers to catch cans mounted down by the frame. Motor breathes no mess and no in cabin smell. I had mounted it higher (at the battery location) as in old pics in my gallery but still would get a slight smell.

Or you could mount remote breathers or catch cans or whatever you choose down to the bumper area or where every you decide to eliminate the smell.
I was concerned that this could possible put oil (on the track) or under the truck and it will not. There is just not enough oil/crankcase gases in liquid form that reaches the breathers to create any problem. I check it frequently and change the oil every 4 months.

here is a pic I took back in Feb of the lines at the pass. cam cover and oil fill to my remote located box.
https://www.f150online.com/galleries...108-149623.jpg

 

After reading that string over on the vette forum, it sounds like I could possibly be pressurizing the crankcase at wot if there is too much back pressure in the exhaust. I am running a Bassani catback and will have the catless mids, so I wonder if that will offer enough recuction in back pressure to make the system work at wot. I really think it will, but I wonder if it would help to still run a breather at the oil fill cap. If the system becomes pressurized, that would allow an escape point. Or would this reduce the vacumn the system is trying to create? Dammit I need a bigger brain.

 

I wouldnt think it would be an issue on forced induction.

 

why, there is the potential for much higher bp with forced induction.

 

If they work like they say they do, there should never be an issue with back pressure.

The whole point of these if positioned correctly in the exhaust is that the flowing exhaust gases create a pocket of low pressure at the nozzle (part in the exhaust stream) which will pull a vacuum on the crankcase.

The higher the back pressure means the higher the flow of exhaust gases which will mean more airflow for crankcase ventilation.

If you install these you definitly want to install them like Figure #2 in the instructions for "oval track" with both separators on one valve cover and install a filter breather on the other valve cover to act as an inlet for air into the crankcase.

If by some chance, under the most extreme conditions, your blow by pressure is greater than you evacuation suction, this breather would relieve that pressure. But 99% of the time the air will be entering the crankcase through this breather rather than leaving it.

 

well said, Id add to that, if you place the vents at the low pressure area in the system ie. the collector its possible the scavenging effect will further enhanse evacuation, However after much thought on this isuue I think Ill stay with the 3 breather setup with extensions to curtail the smell. Interesting idea tho, Keep us posted

 

That type of evac system is best used for RACE only vehicles with completely open headers. i would not suggest this for the L, its not designed for use in an exhaust system with mufflers or pipes. just my 2 cents.

 

Ditto, Toooo much exhaust back pressure, 3 psi on the best systems with cats and 5 psi on others.