This is a BP05 with a VW 1970 fuel fiter connected between the PCV (cylinder head) and Intake manifold.

The PVC works by vacuum force. The deal is oil and gases from the cylinder head get inside the manifold and pistons chambers. In others words excess oil accumulates in the valves, top of the pistons AND reduces fuel quality.



Yeah it makes sense if you dilute fuel with oil obviously the quality will be affected.

Solution:

Install, for now, a fuel filter so gases and excess oil filters before getting into the manifold.

Results: Helps to give smoother idling and car does not have piston knocking even w/ 87 CA gasoline.

Recommendations:

To be able to make fuel filter last longer use an Oil Catch a Can to collect the oil that tries to get into the manifold. Trust me, you engine will appreciate this simple mod.

 

so you're saying that you installed a tiny fuel filter in between your pcv and intake to help filter out the fumes from the oil going back into the intake? That seems like a good plan but how often do you think you'll have to replace that fuel filter?? It seems to me that oil would clog a fuel filter pretty quickly.

 

Just read the recommendation part from my post.



That is why I will install an air compressor filter acting like an Oil Catch a Can.

It does not hurt to install it the day before emissions.

If maybe it would raise any eyebrows from the smog tech just paint it black so it looks factory looking or run a line and put it underneath the intake manifold.

But I do not think the tech will say anything, it is for better emissions. I am looking for a small R/C airplane fuel filter for the return line from the Carbon Canister. It does help emissions and it kinda helps performance cause the octane level stays consistent from the pump.

 

why not just install one of those little filters they have at pepboys for like $9 and cap off the nipple on the intake manifold ??? This seems a bit overthought...

 

Sure, why not, I am trying to make it as emission legal as possible.


Dumping the HC to the atmosphere would be the best option to maintain octane rating and a spankin clean manifold and engine chamber ( and I mean valves, pistons, etc).

All in all, you got a point, that how racing cars have it, out to the atmosphere, instead of the HC back to the engine.


But, what about the oil mess????

You dont want any on your engine bay spurting out from the cylinder head.

http://benelliwang.badassride.com/Engine/index.html#PCV

http://www.bethcutler.com/%7Eswett/gallery/album30

http://home.hawaii.rr.com/twinturboz/catchtank.htm

One good thing about having an Oil Catch a Can is, it will tell if there is any leak from the cylinder head or if the piston rings are letting oil pass thru. For me, it is like another way to predict if the engine is consistent. Just check the links, the first link at least...Highly recommended.

 

I currently vent to atmosphere in my Protege, but plan on using a similar type catch can with a pressure line filter on my MX6(turbo)...If you use the one that craftsman makes it costs like $20, but it'll hold a LOT more oil than that one

 

PCV-positive crankcase ventilation

fuel filter inline...equals poor mans oil catchcan.
bottom line.
sure it will help to remove some oil residue... but what type of negative effects are inquired with reducing the pressure by adding an inline blockage?

a fuel filter is designed to be used with liquids not air.

 

Just visit the links, I put them there for people like you.

And if you read from the beginning of the thread. I said I am going to install an Oil Catch a Can after this cheap experiment.

No kidding, fuel filter is for fuel...?

Its not me I am making this up. I did it on the car and the difference is noticeable, much much smoother idle. Wait when I post pics of Before and After of the fuel filter.

The purpose of putting a fuel filter was to see "if it worked at all", if it really cleans. And from day to day I check on it and can notice it is working. In the links I included some use the Oil Catch a Can, others use two fuel filters, others use both.

You mentioned about how much restriction I am putting in. I can tell right away that what you posted does not make sense. About how much restriction w/ the fuel filter.

There are tons and tons of magazines and racers who do not use any vacuum at all. Just the Catch a Can w/ a filter at the end. I looked into many many magazines and even from drag racers from Infineon, they just dump the gases into the atmosphere and used no vacuum.

I tried the fuel filter by blowing thru it and has NO restriction at all. Checked vacuum Hg and was consistent before and after.

Its a cool mod if running NOS and need all the octane possible.

 

care to enlighten me on how it just vents into the atmosphere? if you know.

vacum through the PCV system in your valvecover draws the waste gasses out of the motor....
notice people put small filters on one side... its one large sucking route(NA) to expell the waste gasses out of the motor.
pressure builds inthe crank case above and beyond the outside pressure.above one atmospheric pressure. its more effecient to draw it out via vacum than it is to just have it vent into the atmosphere. reason why oil catch cans were created.

im sure its fine to vent it into the air if your running a drag motor... but for everday driving and emmisions testing... you might as well leave it the way MAZDA ENGINEERS designed it.

the cost of continualy replacing a dirty inline fuel filter would out cost a cheap yet *does the job* oil catchcan.... you might as well make a write up incouraging people to use an oil catchcan instead of wasting money... "do things right or don't do them at all" is a good motto.
my final 2 cents

 

The main and only reason is to SEE that oil does go thru into the Intake Manifold. I have read about it from others, but I decided to do my own "experiment". Just read (one more time) the RECOMMENDATIONS part.

You are like Roddimus Prime, asking the same question and bringing up something that has already been answered.


Read the November 12 2004 post at 4:50 AM or the 7:24 pm. Both will answer your doubts and any future sarcastic recommendations.

In other words read each post before urgently replying. Unless you want to break the record of the other famous question: "How to do an engine swap?".

I might as well do a writeup to encourage people to use a Oil Catch a Can, once again in the recommendations section (pls read, its easy just scroll up) of MY FIRST posting I clearly state that and the links is self explanatory by now,

Last, but not least. That is why also said that at least it is good to install one the day before taking it for smog,bla bla bla.

 

That sounds dangerously close to an insult. If you read my ONLY post in this entire thread it was just to clarify what you said/meant.

Maybe burning bridges isn't wise when you're on that little island all by yourself. No matter whether I agree or disagree with what you're doing I haven't said ANYTHING negative or condescending to deserve an "internet diss".

lighten up.

 

No I did not, if you read I am saying what other mods people do, but not how the PCV works.

I explained, it is a cool idea for NOS or for emissions. Like maybe install it on a weekend, etc. The same way people install the muffler silencer. It is a cheap crappy mod, but is like having a VIEW of what is going in into the manifold.

When I saw that the CHEAP fuel filter mod really works, I was more than ever convinced I needed an Oil Catch a Can.

************************************************** *********

 

HAHAHAHAHA

"To be able to make fuel filter last longer use an Oil Catch a Can to collect the oil that tries to get into the manifold. Trust me, you engine will appreciate this simple mod."

still encouraging people to stuff and inline fuel filter not use just a oil catch can


like i said instead of being a bustdown shadtree mechanic.... just use the oil catch can and be done with it... why waste your time running an inline fuel filter...
do you think that an oil catch can is poorly designed...
besides... blow bly comes in the form of vapors not liquid oil..... by running an oil catch can you will increase the amount of oil removed from the PCV system simply by the fact that the vapors will cool and liquify given more time away from the motor running in the PCV circuit. and thats far above what the fuel filter can catch.

 

P.S. if you didn't know before hand that your PCV system will put oil vapors into your intake manifold then you've got issues

 

if its such a "CHEAP CRAPPY MOD" why did you waste your time typing about it?