My friend has an accura with all kinds of fun stuff done to it. One small thing that caught my eye was this; on the cold air intake there is the small vaccume hose that lets excess oil from your manifold back into your cold air, and then just gets burned up. But he has a small cone-filter breather that comes off the manifold, so it doesn't dump the oil back into the cold air intake. What is the benefit of this?! and whats your opinions?!?!

Thanks!!

 

there is no oil that gets dumped into the air intake or recycled or burned or period
I think there is a lot of grammatical cofusion here and your prolly talking bout the little bung on the air intake that has a hose that connects to the......forgot the name bung on the blocks head...they look cool is bout it

 

or are you talking about that he has a breather filter on top of his valve cover?

 

Yes, there is oil vapor that "can" be piped into the intake through that, and the filter he put on there takes the place of the stock air filter.

What happens is under high vaccume (idle) crankcase vapors are pulled into the intake manifold, and fresh clean air is pulled through that tube into the crankcase, that normally connects to the intake pipe. That little filter cleans the air that is pulled INTO the engine at idle.

"however'' at low vaccume(non idle, and especially full throttle) oil vapors that would normally be pulled through the PCV valve into the intake manifold, can be pushed out that little filter, which is why its not "legal" for emissions reasons.

more oil vapor will be pushed if you have worn piston rings, creating higher than normal crank case pressure...

hope that helps!


sohc

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SOHCMAN &raquo;</TD></TR><TR><TD CLASS="quote">Yes, there is oil vapor that "can" be piped into the intake through that, and the filter he put on there takes the place of the stock air filter.

What happens is under high vaccume (idle) crankcase vapors are pulled into the intake manifold, and fresh clean air is pulled through that tube into the crankcase, that normally connects to the intake pipe. That little filter cleans the air that is pulled INTO the engine at idle.

"however'' at low vaccume(non idle, and especially full throttle) oil vapors that would normally be pulled through the PCV valve into the intake manifold, can be pushed out that little filter, which is why its not "legal" for emissions reasons.

more oil vapor will be pushed if you have worn piston rings, creating higher than normal crank case pressure...

hope that helps!


sohc</TD></TR></TABLE> You earned it

 

I've got next round

 

so that dumb little filter serves, what advantage opposed to just a hose conecting the valve cover and the intake pipe?

 

Well thanks for all the info!! but as 361 accord said, what is the advantage to the filter instead of just piping it back into the air intake? I'm sure its only a small change, but I would still like to know.

Thanks again!

 

Well the oil vapors which are put into the air intake is then sent into the combustion chamber to be burned off. With the filter in place, the oil no longer gets to go that route, so then you're just burning air and fuel. With less vapor in the chambers, that means more air can be in the chamber...and you know what that means

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 361 accord &raquo;</TD></TR><TR><TD CLASS="quote">so that dumb little filter serves, what advantage opposed to just a hose conecting the valve cover and the intake pipe?</TD></TR></TABLE>

Purely aesthetic unless you just so happen to have an aftermarket CAI/SRI that does not have a connection for the valve cover fresh air intake port. Or you don't want oil getting back into your CAI under WOT as explained by SOHCMAN

If you still don't understand. Maybe you should do a search on how your engine works. Pay special attention to the chapter on PVC or Positive Crankcase Ventilation. You may be able to grasp the dumb filter concept then.