I am thinking about just doing two breathers on my new 600 horse BBC and eliminating pcv. Anyone doing this in a closed engine compartment. Am I going to have oil mist everywhere? Let me know what your running and if it works. My cam is a .650 lift with a 850 holley dp. Big rect. Heads and powerflow exhaust.
I would consider having both up front then ran to a puke tank....that should keep it from spittin. I have a closed with a pcv on the rear side and a reg breather on the front....I replace it at least 1-2 times a season. Watch out for the fumes...I just saw this pic...
you'll end up with a little oil, but being it is a closed engine compartment, it won't go everywhere. you can get a puke tank or taller breathers to help with the problem.
I did a single PCV only system on a stock bbc. It was blowing oil out the dipstick tube. Gen 6 motor designed for a closed crancase system originally. Added breather in the valve cover and no more blowing oil. So I guess what I'm saying is even a stock engine needs to have the cranck case breath some way. If you eliminate PCV you better have decent VC breathers.
PCV works for what it's intended for. I don't really care about having oil film being put into the intake manifold. A guy could always get one of those little air/oil separators that you use on air compressors to remove the oil out of the air. We had to do that on several LSx motors because they were sucking oil mist from the valve covers into the TB. That fixed the problem, and the pcv still worked like planned. You'd be surprised how much oil gets past those pcv valves and goes straight into the manifold or carb.
Not splitting hairs but breathers in the valve covers or evac tubes to the headers are all types of crank case venting. Emission reduction was the reason to use a PCV valve and recycle the hydro carbons produced by heating the engine oil. In a performance application a good set of breathers usually does just fine. Point is to let the crank case vent and not build pressure. Now if you want to go all out, put a vacuum pump set up on your engine for that last little bit of HP.
If you run open breathers and PCV the PCV doesn't work
PCV is designed to vacuum the crankcase into the intake manifold - smog stuff. By adding a breather vent you eliminate the possibility of vacuum. Waste of time you by passed the design
Thanks for the replys...I got the CP extreme valve covers and 2 breathers for them. Can anyone give me a proven location to mount the breathers. Im gonna have my buddy machine the valve covers this week.
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