OIL SEPARATOR/PCV/VENTING/RAM-AIR!

Joined: 09 Jul 2004 Posts: 5758 Location: Albuquerque, NM

SCQ topic to read. Laughing

But...if you need PROOF that KV is a LIE.. Shocked

RUN A TEST FOR VACUUM FROM THIS COVER! Rolling Eyes

http://www.starquestclub.com/forums/viewtopic.php?t=56151

Engine VENTING is somewhat misunderstood. Do you need a VENT? Yes, you do. Do you need a PCV? No you don't......but it helps ventilation be more effective. How does it work? It's merely a VACUUM CLEANER from 2 differant sorces. Will the engine make more power without a PCV? Not enough that you would notice. Besides, the PCV CLOSES UNDER BOOST. But I'll show you a few differant ways to vent the engine....starting with the factory setup.

The following thread explains what I have known to be true from the beginning when I heard you'll pay $100+ for that "KV" nonsense. Wink

Btw....ENGINEERS... Rolling Eyes

...go back to drawing pics that are USELE$$!

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

Lots of "DONORS" so let's take one apart so we can see how it works. Wink

At the front of the valve cover is the PCV valve. That stands for "POSITIVE CRANKCASE VENTILATION". At the rear of the valve cover is a BAFFLED vent pipe. No "one way valve"........just a BAFFLED NIPPLE,
same as the PCV CHAMBER.

Note both the PCV and the rear vent are RAISED above the rest of the valve cover. We want to remove HOT GASES, NOT THE OIL that is traveling with the gases.

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

Stock valve cover with no mods. Notice the BAFFELS located below the PCV valve and the VENT OPENING at the rear. The baffels keep RAW OIL from being DRAWN OUT with the crankcase fumes.

Also note the FENCE just behind the PCV baffle. The valve train & T-chain is slinging a bunch of oil around BEHIND the fence. The oil will MIX with the fumes as they are drawn out.

A small amount of oil will still be drawn out of both openings. And at the rear vent (cause all that oil is being drawn rearward) that's where the OIL SEPERATOR comes in.

What are "CRANKCASE FUMES" or "BLOW-BY"? It is a by-product of the combustion process that escapes past the rings.......into the oil pan/crankcase.

Because it is very hot, it wants to travel UP. So.....if we supply a LOW PRESSURE AREA in the upper part of the engine (valve cover) it will follow the path via the OIL PAN to the TIMING COVER and up to the VALVE COVER, to the low pressure area created by your PCV or rear vent. Now all we need to do is REMOVE IT. Wink

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

Modified valve cover on the right to clear HEAD STUDS & NUTS.

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

Both of these valve covers were modified for head studs. Just so you know, once you cut that fence MORE OIL can get past the baffle.

I'll remove the baffels from the top valve cover to show you whats inside.

BTW, If you're going to do this modification, stop and think. COMPLETELY remove any oil residue so the metal flakes won't adhere in areas under the baffles. Masking tape off as much of the baffle as you can. Once you have the necessary clearance, rinse the valve cover in a parts cleaner and blow dry it to death. The Ali. WILL find it's way to your oil pan. Wink

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

After I removed the baffel........there's ANOTHER BAFFEL under it. Wink

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

Looks pretty nasty, don't it? This is about as clean as regular cleaning solvent will get.

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

As you can see, the VENT HOLE is wide open. The oil/fumes must travel thru a MAZE to get to the vent hole. There are small openings in the "FENCE" around the vent hole.

Hard to see it, but there is a BROWN gasket above the top baffle. CAUTION: It's very fragile on high milage engines.

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

This hose is fine for a VENT.....but too LARGE to use on the PCV this APPLICATION!! Rolling Eyes

Could you vent this way? Sure you could. A small amount of BREATHER FILTER will help keep the oil from running out of the hose.
But this is kinda messy to the engine. It will DRIP oil from the hose once in a while.
Would I run a PAPER TYPE FILTER HERE? The paper will become OIL SOAKED very fast........not a very good vent.

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

This is a little more practicle. If you rig a 1/2 pipe to a lower point on the car, and cut a 45* angle at the bottom of the pipe, as the car moves down the road a vacuum is formed over the pipe.
This was the way crankcase fumes were vented back in the early years. It's called a "ROAD DRAFT TUBE" That's why the interstates used to have a black strip running down them. Laughing

I would still run the breather filter fabric inside the rubber hose. And.....I would still run the PCV as well. OR.....eliminate the PCV and install a NIPPLE FITTING in place of the PCV and make it a "ROAD DRAFT TUBE" as well.
You know Uncle Sam would have a FIT! Laughing

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

$4 and you can clean it over and over with cleaning solvent. Just use a SMALL AMOUNT.......don't PLUG THE VENT WITH IT. Shocked

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

On the left is a NIPPLE FITTING, not a PCV.

SPECIAL NOTE: If you DO NOT use a HOSE that is RATED FOR VACUUM/PCV HOSE...once that hose heats up it will be SUCKED CLOSED!!! Rolling Eyes

I believe the NUCLEAR SCIENTIST'S PCV HOSE is the WRONG KIND OF HOSE!!! Rolling Eyes

This kind is OK and will stand-up to PETROLEUM PRODUCTS But READ the box!! FUEL INJECTION HOSE IS MUCH BETTER.....$$ Wink

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

I keep telling you guys, you have to TAP, the threads, from,
1/8" x28 to 1/8" x27NPT!

Performance, CRATE, engines... Rolling Eyes

have NO-MEANS, at running
a PCV!

Attach a 3/8 hose, below the oil pan. Let your engine BREATH! Cool

Only makes the EPA, happy. Mad

Plug, your intake manifold, nipple
or install a pipe-plug, in its, place.

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

Good thing, Joel...your are a computer, "programer"!! Laughing

I guess this is "Krank Vent's" idea for a PCV.
Did they forget to put in the directions,
that you NEVER, TAP-OFF FROM THE PCV HOSE?

And what's the small hose about? You're killn me. Laughing

MOST OF THOSE SILICONE HOSES ARE A JOKE!!! Rolling Eyes

This "JOKE" was from the "REBUILT" engine of a SITE, ADMIN, MORON!! Rolling Eyes

Btw.....DO NOT TAP-OFF OF THE BRAKE BOOSTER HOSE EITHER!!!! Rolling Eyes

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

You can bet your PCV is LOADED with CRUDE and maybe not behaving correctly.........unless you bought a new one from Mitsu. MD024719 You can wash this out with parts cleaner and merely BLOW/SUCK thru them to make sure they are working correctly. Wink

If you'll RESEARCH the PUROLATOR CATALOG......under several Mitsu engines...Turbo & N/A engines SHARE.....the SAME P/Ns!

In other words: Purolator knows how to build a PCV that WORKS! Wink

CONTROLLED VACUUM via A FIXED ORIFACE....

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

Is it really a "ONE-WAY VALVE"? Bout 98% one way if you blow on it with your mouth.
But boost pressure will close it off 100%! Wink

You don't want boost blowing into the valve cover. Shocked

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

A PCV is a VACUUM CONTROL DEVICE.....and a ONE-WAY VALVE..at times.
Example: If you had a BACK-FIRE... Shocked

that could REACH the CRANKCASE.... Rolling Eyes

do you know how to make a BOMB? Laughing

There are a few PCVs that look ID to the right one. But you can't go by that. It SHOULD be a TURBO PCV.

Check out the catalog.....the Colt & Starion listings. ( 2 differant engines) And....note what P/Ns are used on turbos & non-turbos applications. A TURBO PCV IS NOT DIFFERANT THAN A NON-TURBO APPLICATION. Rolling Eyes

"If it don't come from Mitsu...it's the wrong PCV" Rolling Eyes

Yeahhh, Righttt! Laughing

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

New PCV hose MD026609. (deleted now) Crying or Very Sad

Do not use regular 5/16 hose here. It gets hot and will collapse under high vacuum. Shocked

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

The PCV port under the TB can also start to plug up.

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

No, it's not suppose to be HARD as a cracker. It's RUBBER........or was. Laughing

Mitsu sells the gasket ALONE. MD311638 $1.68 retail $1.34 net

If air leaks in past the filler cap........it's not drawing from the vent the way it was designed to.

Crankcase gases are INERT!! That means they won't burn. So you don't want FRESH air entering past the filler cap or ANY LEAKY GASKET!! Rolling Eyes

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

STOP! Do you REALLY THINK that upper hose sees VACUUM from the accordian nipple Question

NOT! A DRAFT is not a VACUUM!

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

A plugged or restricted oil return hose can make the "oil seperator" fill with oil. This can make the engine DRAFT in raw oil thru the accordian hose and make your engine smoke like crazy. Shocked

Replace with a hose that is RATED FOR OIL USE such as Automatic transmission cooler hose.

Regular 5/16 fuel hose is not always rated for this job. Rolling Eyes

Joined: 06 Oct 2004 Posts: 1640 Location: Gilbert, Arizona

As you can see the side hose (from the valve cover) dumps INERT GASES & SMALL AMOUNTS OF OIL near the bottom of the seperator.

Above it are the TWO BAFFLES. FRESH AIR being drawn in/drafted in THRU the accordian hose (top nipple) creates a small DRAFT with then DRAWS the crankcase fumes/blow-by into the intake system......allowing the CONDENSED OIL to drian back down to the oil pan return nipple.

If the seperator cannot drain....SMOKE CITY! Shocked

Worn-out pistons rings....this problem is worse. Wink