I've got a 96+ B18B with no valve cover. From everything I've read, the 96+ has the PCV valve on the valve cover while the 94-95 is connected to the breather chamber which is connected to the block. I'm trying to understand the PCV system to see if I can use a valve cover from a 94-95 LS.



Is this a picture of the two seperate systems? Is the one on the left the entire system for the 96+?

 

my PCV valve is right in the middle of the valve cover. here is a pic.

 

So what's under the valve cover then? How does it ventilate the crankcase? Anyone have any pics under the valve cover?

 

Most likely the '96+ valve cover has baffles underneath where the PCV valve goes. That's supposed to let oil drain back into the engine, like the breather box is supposed to do on '94/'95 engines. Your picture shows both systems.

If you wanted to use a '94/'95 valve cover I guess you'd have to put a breather box on your engine. Does your block have the fittings for that??

 

I'm not sure if it has fittings for the breather box. I'm in Kuwait and the block is in Sacramento.

So the left part of the diagram is the entire PCV system for the 96+? Just the PCV valve on the valve cover connected to a hose to the intake manifold? That seems too simple.

Thanks for the help so far guys.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SoulSurfer &raquo;</TD></TR><TR><TD CLASS="quote">I'm not sure if it has fittings for the breather box. I'm in Kuwait and the block is in Sacramento.</TD></TR></TABLE>I bet a '96+ block won't easily accept the breather box from a '94/'95. You'd have to drill some holes or ??? You're much better off finding a valve cover to match the engine.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SoulSurfer &raquo;</TD></TR><TR><TD CLASS="quote">So the left part of the diagram is the entire PCV system for the 96+? Just the PCV valve on the valve cover connected to a hose to the intake manifold? That seems too simple.</TD></TR></TABLE>I bet #9 & #11 over on the right are there for all years. But the stuff in the middle of the picture isn't. A later valve cover should have baffles to let oil drain back. You can't just drill a hole & stick in that #10 rubber grommet...

 

To settle this.

The obd 2 LS motors, do not have an air/oil seperator box on the back of the block. The pcv system works by collecting all the crankcase pressure at the top of the valve cover from the oil galleys.

The obd 1 LS motors, do have the black box on the back of the blocks to seprate the oil and crankcase vapors similar to the vtec motors.

You can not just bolt on a air/oil seperator box on an obd 2 LS motor, you would need to drill out the block, and tap in a nipple in one of the oil return galleys.


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SoulSurfer &raquo;</TD></TR><TR><TD CLASS="quote">I've got a 96+ B18B with no valve cover. From everything I've read, the 96+ has the PCV valve on the valve cover while the 94-95 is connected to the breather chamber which is connected to the block. I'm trying to understand the PCV system to see if I can use a valve cover from a 94-95 LS.



Is this a picture of the two seperate systems? Is the one on the left the entire system for the 96+?</TD></TR></TABLE>

Yes. The one on the left is a completely diffrent system for 96+.

-sander


Modified by sander at 11:23 PM 2/3/2004

 

Thanks guys. It all makes sense now . I guess I HAVE to get a 96+ valve cover.

 

would you be able to use the 96+ valve cover and pcv valve on a 94-95 and just cap off the breather box?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mxpx035 &raquo;</TD></TR><TR><TD CLASS="quote">would you be able to use the 96+ valve cover and pcv valve on a 94-95 and just cap off the breather box?</TD></TR></TABLE>

Why not just cap off the valve cover? That seems like it would be easier.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SoulSurfer &raquo;</TD></TR><TR><TD CLASS="quote">

Why not just cap off the valve cover? That seems like it would be easier.</TD></TR></TABLE>



-sander

 

Up from the dead, im having a hell of a time finding an OBD2 valve cover. I'll keep searching but is there anyway I can tap the OBD1 cover and install the pcv valve? What are the negatives to plugging it?

 

check my sig, i have one available

 

ok someone please help me out... I have a greddy catch can and a turbo obd1 ls... what goes where... do I take a line from the oil/air seperator box, and run it into the can, then run a line from the can to the nipple in the middle of the actual IM like in the picture above. I'm just confused, if I do take a line from the box, which line should I take... any help is great.

 

Here's a quick fix, if you have a 94-95 valve cover with a 96+ motor.

Drill a hole in your plastic oil cap, and plug it with the pvc valve.

Works, trust me.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wreckedmyteg &raquo;</TD></TR><TR><TD CLASS="quote">Here's a quick fix, if you have a 94-95 valve cover with a 96+ motor.

Drill a hole in your plastic oil cap, and plug it with the pvc valve.

Works, trust me.</TD></TR></TABLE>

ya it may "work" but it will probably suck up more oil than normal. the place where the PCV valve is located on the 96+ valve cover is baffled to keep oil from getting sucked into the PCV valve.

on the oil cap like you have the PCV valve will suck up as much oil as it pleases since there is ALOT of oil sloshing around while the engine is running. there is no baffle under the oil cap.

 

Just an FYI, the 94-95 valve cover does have a baffle, so it is possible to drill a hole in the top and stuff in the PCV valve and a grommet with no down falls.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by powerls &raquo;</TD></TR><TR><TD CLASS="quote">ok someone please help me out... I have a greddy catch can and a turbo obd1 ls... what goes where... do I take a line from the oil/air seperator box, and run it into the can, then run a line from the can to the nipple in the middle of the actual IM like in the picture above. I'm just confused, if I do take a line from the box, which line should I take... any help is great.</TD></TR></TABLE>

Im wondering the same thing can someone answer this?
Can i just go from the PCV to the catch can then back to the block?
Is there any use in using a catch can with the OBD1 motors?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sander &raquo;</TD></TR><TR><TD CLASS="quote">To settle this.

The obd 2 LS motors, do not have an air/oil seperator box on the back of the block. The pcv system works by collecting all the crankcase pressure at the top of the valve cover from the oil galleys.

The obd 1 LS motors, do have the black box on the back of the blocks to seprate the oil and crankcase vapors similar to the vtec motors.

You can not just bolt on a air/oil seperator box on an obd 2 LS motor, you would need to drill out the block, and tap in a nipple in one of the oil return galleys.


Yes. The one on the left is a completely diffrent system for 96+.

-sander


Modified by sander at 11:23 PM 2/3/2004</TD></TR></TABLE>


an obd1 ls motor has the coolant temp sensor in the back of the block instead of the thermo housing right? i just did an ls that we had to drill and tap into the back of the block cause he had obd2 block, obd1 everything else...

now my point is that i had an obd2 ls with no breather box, as stated.

my new block however does not have the coolant temp in the back of the block, but does have the breather box. my buddies 00 gsr also has the breather box... why some years/models and not others?

 

I'm bringin this back from the dead for a quick question....

Say you have an OBD1 B18b engine and you wanted to use an OBD2 B18b valve cover. Which PCV system is better? Or I can only use the breather box setup?

 

in 96+ honda eliminated the breather boxs on the ls engines. i believe the pcv valve itself is the same just in the pre obd2 years it was ran into the breather box like on the b-series vtec engines....then on the obd2 ones that are ran into the valve cover.