Valve Cover Breathers

07 Boss · Apr 21, 2009

Just a couple of little shiny things for my clean engine bay. A little funcionality too. I got a baffled oil breather/filter coming too from Central Florida Motorsports.

navyman8903 · Apr 21, 2009

looks clean.

Nasty · Apr 21, 2009

Nice. I need to do that ... Have a link to the valve cover breathers?

07 Boss · Apr 21, 2009

Got them from Summit. Can't remember the part #'s. I think KN 63-1320 and KN 63-1340.They are simple clamp-ons but the drivers & passenger side are different sizes for some reason, 3/8" and 5/8".

Nasty · Apr 21, 2009

Cool, thanks.

07 STROKER · Apr 21, 2009

dont those drip oil onto the cam covers?

Nasty · Apr 21, 2009

Kind of .. It's not bad from what I've seen. It's better than puffing oil and smoke out the back though. :lol

07 STROKER · Apr 21, 2009

ya but for me or you huffer guys....wouldint a catch can be more effective?

07 Boss · Apr 21, 2009

I think it all depends on how much blow by you get. If it's not too bad you shouldn't get any oil leaking out. You F/I guys might encounter some oil on the cam covers. Either way, whether your running breathers or a catch can, I don't like putting the blow by back into my air/fuel mixture. If these were baffled you wouldn't get any at all with either application. Like I said earlier, I'm also getting a baffled oil cap breather/filter to help vent the crank case which should lessen the pressure on the valve cover breathers, so I'm hoping not to get any oil spillage.

Nasty · Apr 21, 2009

Are you sure those are the right sizes?

Nasty · Apr 21, 2009

Also, does anyone know if the threading is the same on the valve cover as it is on the filler neck? I don't have the filler neck on my valve covers anymore but want to order the oil filler filter from Central Florida Motorsports. Will it work?

07 Boss · Apr 21, 2009

Yeah, they are the right sizes. I still have the packing on the garage table and that's what I told the guy at K&N when I got the part numbers.

You don't have a filler neck? Does your cap screw right into your valve cover? The one from CFM comes with a it's own filler neck. At least that's what it looked like. I ordered one last week and will post pics as soon as I get it and put it on.

Nasty · Apr 21, 2009

Cool, I ordered those filters and some caps.

I don't have the filler neck, correct. My oil cap screws right into the valve cover.

usafimj · Apr 21, 2009

Whats the purpose of the breathers

07 Boss · Apr 21, 2009

Well the breathers just vent any positive crank case pressure caused by blow by into the atmosphere instead of back into your engine to get reburned. Basically any exhaust gases that make it by your rings during the power stroke, or for that matter the compression stroke, need to get vented or pressure would continue to build inside of your engine. If enough pressure builds inside your block it finds a way out via busting a main seal or something else. Positve crank case pressure also makes the engine work harder just to run, let alone make any power. Currently your stock PCV (Positive Crankcase Valve) routes the blow by gases back into the engine, These just let them escape. By doing this you can prevent a lot of oil, or oil mist, from entering your intake system and gumming it all up. A catch can system will remove the oil from the gases but still route that stuff back through your engine.

usafimj · Apr 21, 2009

Cool thanks for the info

ROUSH STAGE II · Apr 21, 2009

Looks good bro, and good choice with the Central Florida Motorsports breather. The only one I get a little oil in is the one that replaces my oil cap (k&n) which isn't baffled. It never leaks out though. I'll probably swap it for the CFM baffled breather sometime down the road. Good Job!

TimboStang · Apr 21, 2009

I really need to work on getting this done too. Could be some extra HP and torque hiding in the crankcase.

svt95gt · Apr 21, 2009

does the crankcase need any negative pressure? I had a turbo car that wouldn't run right because it was a negative pressure crank case (according to dealer) and I put a CAI on it that didn't have the ccv nipple on it.

07 Boss · Apr 21, 2009

They do make crankcase pumps. And actually the way the stock set up works is that if uses negative manifold pressure (vacume) to help evacuate gases from the engine. It is my understanding that crankcase pumps can help F/I setups because they tend to get more blow by. Whether or not it is necessary is debatable. Just about every V-8 that I have owned I have been vented in this manner though and never had any issues mechanical issues. The 2 possible drawbacks to doing it this way is possible oil seepage from the filters onto the engine and fumes in the cabin because the gases are vented into the engine compartment instead of back through the engine.
But to really answer your question, It is not necessary to run negative pressure in a N/A setup because any positive pressure will find its way out throught the breathers anyways. It may be beneficial but not necessary.

onederful100 · Apr 21, 2009

do you have a different oil cap? is the threading different than the stock oil cap?

Nasty · Apr 21, 2009

No, it's the stock oil cap. It screws right into the valve cover like the 4Vs. I got rid of the filler neck because I thought it looked cleaner that way.

shanec · Apr 21, 2009

Having just read why breathers are supposed to be good - why doesn't the factory do this?

onederful100 · Apr 21, 2009

emissions

Nasty · Apr 21, 2009

Exactly.

Valve Cover Breathers

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