any body do this?? and if so did u guys have any problems with your car?

 

That is bad for your car. I will try to find all the info.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">Originally posted by SurferX on Jun/28/02
The breather helps ventilate the crankcase. It surprises me how many people mistakenly think the air blows out into the intake so they think removing it will give them more power. Talk about misinformed. Mike D posted a good write up on this before:


Here's the stock PCV diagram from the Helms manual. On the left is a cutaway view of the engine. On the right is a cutaway view of the stock intake. In the middle are the separate breather circuit and the PCV valve circuit:



all you have to learn is how the fresh air cicuit flows (follow the open white arrow) and how the crankcase vapor (with oil vapors in it ) circuit flows (follow the black arrows). Notice which circuit flows to the valve cover (on top of the engine on the left)....it's NOT the crankcase vapors. When you add a breather, you remove the line from the intake to the valve cover.


The honda crankcase breather is a POSITIVE pressure ventilation system.The air from the intake blows into the valve cover. It is NOT a negative pressure ventilation system...it does NOT suck air from the valvecover to the intake.

Breathers remove the source of positive ventilation that repressurizes the POSTIVE CRANKCASE VENTILATION (PCV) valve.

There is less pressure in the crank when you add a breather at the valve cover. The consequence of this is you get more positive blow-by from the combustion chamber past the piston rings and into the crankcase. More blow-by means less cylinder pressure...less cylinder pressure means the burn is slower and less complete...the result is more emissions and less power.

If you want to do this right and remove oil vapor from the circulating crankcase before it goes into the intake valve then, get an oilcatch can and put a breather on the catch can. Then place the catch can in between the valve cover breather and the PCV valve.

Disconnecting the breather tube, which blows fresh intake air into the valve cover, and placing a breather on the valve cover just creates more blow-by and emissions. Eventually you have so much blow-by, you lose power.

</TD></TR></TABLE>

 

ic thats what i thought but would this affect your gas tank in any way??
because my check engine light came on, and the code i got was a p1456 which means the pressure in the gas tank is low, checked the gas cap and its fine

any other suggestions

 

Make sure you do 3 clicks on the gas tank cap.

 

yeah i did, i think i might need a new cap

 

sooooooo........ this is just the alcoholtalking.....

what would happen if you sayyyy plugged it up ??

 

****, my valve cover vent is hooked up to a tube, which runs down near the tranny.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jay Blazed &raquo;</TD></TR><TR><TD CLASS="quote">sooooooo........ this is just the alcoholtalking.....

what would happen if you sayyyy plugged it up ??</TD></TR></TABLE>

plugged what up??

 

The valve we have been talking about the whole time, lol.

 

is he seroius??

 

sorri i thougth u were tlaking about i plugged something in my gas tank, the filter is off now but would pluging the pcv affect the gas tank pressure is waht i really want to know

 

are you sure that the breather on the valve cover brings in fresh air, it seem like air would be drawn out do to the fact that there is a vacuum in the intake pipe? i need to know for sure because i made a catch can that i was going to hook up the valve cover and the hose to the PCV to with one vacuum to the I.M.

Sorry to thread jack i thought i was relevant,

also sorry if i seem dumb for asking

 

the breather in the valve cover isnt supose to bring in fresh air its supose to just let out vapours from the head

 

that's what i thought but that pic show different

 

I love the write up, but can someone show how you hook up the catch can, I thinking of getting one.

 

i think ur wrong. i think the crankcase pushes air into the intake. basically re-circulating old air with oil vapors back into the intake manifold...

i mean, i u pull the tube out, turn the car on, u can feel air pressure coming out of the crankcase.

i mean, people put oil catch cans in for reason why? i dont think the crank case is sucking clean air out of the catch can...

 

it doesnt suck in clean air thru the catch can, the catch can just makes it so that the oil vapors are not being recirculated in to the intake manifold and cleaner air is going in

 

I'm kinda tired to search for the threads on this info, but this was the breakdown:

THEORETICALLY, as seen in the helms manual, the intake is to supply the crankcase with fresh air. It's a positive pressure system.

But EMPIRCALLY, depending on the amount of vaccuum, which is RPM/load dependent, the system will either be positive or negative. This was only shown through experimental data. Someone actually measured the amount of pressure coming from the crankcase, BUT, and another huge BUT, it was on a turbocharged honda. The data can be found somewhere in the Forced Induction forum.

I don't know how or even if any of this applies to N/A cars, though.

All I know is that my car's valve cover vent is vented to the outside through a tube, which is not connected to anything at the other end. But, when looking down the throttle body into the intake manifold, I still see a bunch of black gunk. I'm thinking that before the previous owner installed a short ram intake, the stock intake was hooked up as it should have been. It seems that negative pressure during higher rpms probably caused the negative pressure, causing the crankcase to vent out to the intake.

Either that or I had a really shitty filter.


Modified by erikiksaz1 at 9:05 PM 9/10/2006

 

I've seen that before too<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by erikiksaz1 &raquo;</TD></TR><TR><TD CLASS="quote">I'm kinda tired to search for the threads on this info, but this was the breakdown:

THEORETICALLY, as seen in the helms manual, the intake is to supply the crankcase with fresh air. It's a positive pressure system.

But EXPERIMENTALLY, depending on the amount of vaccuum, which is RPM/load dependent, the system will either be positive or negative. This was only shown through experimental data. Someone actually measured the amount of pressure coming from the crankcase, BUT, and another huge BUT, it was on a turbocharged honda. The data can be found somewhere in the Forced Induction forum.

I don't know how or even if any of this applies to N/A cars, though.

All I know is that my car's valve cover vent is vented to the outside through a tube, which is not connected to anything at the other end. But, when looking down the throttle body into the intake manifold, I still see a bunch of black gunk. I'm thinking that before the previous owner installed a short ram intake, the stock intake was hooked up as it should have been. It seems that negative pressure during higher rpms probably caused the negative pressure, causing the crankcase to vent out to the intake.

Either that or I had a really shitty filter.</TD></TR></TABLE>

 

i have one on my car (the filter) and it doesn't cause any problems. the reason that the tubes are usually there is for when you hit vtec it causes positive pressure in the head and it sometimes pushes some oil and vapors out. having the tube running to the intake puts those vapors and oil back into the engine and it just burns it. that's why sometimes people have a little puff of smoke when they hit vtec. but a catch can would do the same thing. just hold onto everything instead of putting it into the engine.

 

where did you get this info, sorry its just hard for me to believe that some times it vacuum and some times it positive pressure,

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by coronadrinker &raquo;</TD></TR><TR><TD CLASS="quote">where did you get this info, sorry its just hard for me to believe that some times it vacuum and some times it positive pressure, </TD></TR></TABLE>

Go search the FI forum under any of the keywords. There will be one thread that stands out. Unfortunately, I'm not in the mood to look any of it up

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by erikiksaz1 &raquo;</TD></TR><TR><TD CLASS="quote">Go search the FI forum under any of the keywords. There will be one thread that stands out. Unfortunately, I'm not in the mood to look any of it up </TD></TR></TABLE>

x2

 

i did this when i was n/a but heard on FI forums that i was bad due to the pressure coming out of the valve cover is getting restricted. so i took it off and put a long tube to where my tranny is at