Valve Cover Breathers: What Works?
Ok, currently I have the push in K&N breathers on my valve covers for my fresh 540. One on front of odd bank and one in back of even bank. After running last year I would get a little mist of oily mist from my rear even bank breather after pushing it hard. Not enough to signify issues but enough to make a bit of a mess in the bilge. I imagine this is a run of the mill issue after reading threads about it from searching but I couldn't come up with a definitive answer. My K&N breathers are un-baffled and there is no baffle under the valve covers except the stud girdles.
So here is the question: What do I replace my K&N breathers with, the nice looking tall bolt-on aluminum breathers or do I go to a catch can breather system? What has eliminated the issue for you guys as I have read the K&N breathers are notorious for this issue? |
when the oil gets to operating temp there is a steady mist of oil flying around under the valve cover,this mist finds it,s way out of a breather in the back of a valve cover.
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I got tired of fighting this and ultimately went with a catch can system last year.....no more mess.
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That's why I use PCV systems on my motors.
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So there is no tube going from breather up to flame arrestor? Or pcv system? Before pcv cars used a metal tube venting crankcase down to the road. You must have some way to get crank vent back into intake air. You also get oil smell at low throttle-speed with your current setup.
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Originally Posted by dereknkathy
(Post 4299076)
So there is no tube going from breather up to flame arrestor? Or pcv system? Before pcv cars used a metal tube venting crankcase down to the road. You must have some way to get crank vent back into intake air. You also get oil smell at low throttle-speed with your current setup.
http://i734.photobucket.com/albums/w...ps0thsosnb.jpg http://i734.photobucket.com/albums/w...pststafq8x.jpg |
I was tired of the mess on the valve covers on my Corvette, so I installed a catch can system on each valve cover. A way to improve on the catch can could be to route the vapors off the catch can up yo the spark arrestor
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How are the K&N installed? Eddie Young told me to mount the filter 6 inches above the valve cover. This allows the oil to settle out.
Padraig |
Originally Posted by Gimme Fuel
(Post 4299031)
Ok, currently I have the push in K&N breathers on my valve covers for my fresh 540. One on front of odd bank and one in back of even bank. After running last year I would get a little mist of oily mist from my rear even bank breather after pushing it hard. Not enough to signify issues but enough to make a bit of a mess in the bilge. I imagine this is a run of the mill issue after reading threads about it from searching but I couldn't come up with a definitive answer. My K&N breathers are un-baffled and there is no baffle under the valve covers except the stud girdles.
So here is the question: What do I replace my K&N breathers with, the nice looking tall bolt-on aluminum breathers or do I go to a catch can breather system? What has eliminated the issue for you guys as I have read the K&N breathers are notorious for this issue? |
Originally Posted by Black Baja
(Post 4299115)
I ran K&n breathers on my 632 never much below 6000 rpm and never had a drop of oil out the breathers. The breathers were both in the front of the valve covers (wouldn't clear exhaust in the rear).
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