None at all.

 

Sorry to bring back an old post, but I've got a question . . .

Instead of capping off the PCV tube coming from the back of the lower intake, is there any harm in leaving the lower intake hose connected to the upper plenum and capping off the tee going to the passenger side cam cover?

It seems to me that leaving the lower-intake-to-plenum hose connected leaves the PCV system disconnected, and allows for and fluids (why there would be any???) to get drained. I'm just concerned that under boost, while Shocktherapy and Red92's systems have the lower intake line plugged, it could pop off from the rear of the intake, causing a PITA.

Any thoughts?



Also, Red92, those are K&N filters for your PCV breathers, right? Do you have a part number?

Thanks,
Kevin

 

Yes, dont do it.

It would be the same as leaving the back of the plenum uncapped.... you wouldnt do that.

Think of the intake system in basic terms.

First, the intake system must be a closed system.

Example: factory intake system consists of many components, Airbox, intake boot, Throttle Body, plenum, crankcase, supercharger, etc.....yes on a factory truck the crankcase is nothing more than a closed component of your intake. Now you would not drill a big hole in the any component of the intake would you ?...leaving the lower galley connected to the plenum dose just that....it is not passing over the MAF...,"equal in must = equal out".

By plugging the PCV you simply remove a single component from the air intake system.

If you dont plug the PCV completely you will have an un-equal balance in Air/Fuel ratio which you know is dangerous to our engines. In your example you would have un-metered air in the intake.

 

I'm not sure you're understanding what I meant. I got disconnecting the driver's side cam cover, capping the intake boot, then disconnecting the passenger side cam cover, but instead of, capping both the plenum and the tube from the lower intake, why not just cap the tee that breaks the line from the lower intake to the plenum.

With what I'm talking about, no unmetered air enters the system. The air would still run Filter - MAF - boot - plenum - S/C - I/C - lower intake - cylinders, but as I understand it, there would also be a line that would run air from the lower intake - plenum, effectively recycling already metered air.

It seems to me that this would bleed boost, so the logical question is, does the stock engine already do that? Or is pressure equalized, or is that port in the lower intake too small to effectively bleed too much boost?


BTW, if anyone was interested, the part number for those K&N breathers I was talking about is 62-1320, you can get them for about $15 each.

Thanks Red92

 

Here's a pic of what I'm talking about.



Leave connections 1 and 2 connected (if you can't see, I think number 2 is the connection coming from the lower intake, that was connected to the tee). Then cap off the tee at number 3, and install the breather in the passenger side cover.

 

Is there something better that I can use if I am still using the swanson PCV kit with the one way pcv valve and the dime sized blocker in the tube? I want to keep my pcv system intact but do not want to use seperators or breathers if possible. I have never pulled my SC and have been using the swanson kit for quite a while. Has anything better ever been figured out for this?

Thanks,
Bill

 

Sorry I didnt get back sooner......and am not trying to sound like a "know it all", but I'm clear on MAF, ECU, A/F....

I understood exactly what you were saying. Again dont do it. But if you already did and checked your A/F post your results...

I'll try to show why its wrong.

remember this happens quicker than can be comprehended...a molecule of air gets from the airbox to the tailpipe quicker than you can blink so...its not hanging around to be recycled, already measured at the MAF...

I also understand what "you think" is happening when you hook your lines up like this. recycling already metered air....impossible....
metered air is not something that happens to the air, its simply an exact measurement to determine the airflow into the engine.... It should tell the ECU how much mass of air per unit of time is entering the engine. To do that accurately, the ECU needs to know air velocity, temperature, pressure, and cross-sectional area at the point of measurement. It would get real complicated and beyond the scope of someone without the resources to reprogram and remap the ECU if air was allowed to pass over the MAF into the intake galley and then be redirected up into the back of the plenum without passing back over the MAF

 

Really great info guy thanks for sharing!!!!

 

But the purpose of the MAF is, like you said, to measure the amount of air entering the intake . . . thus entering the combustion chamber . . . and being combusted. I understand the use of the MAF, etc. What I'm not seeing is how the line from the lower intake is allowing unmetered air in. If air passes through the MAF, through the S/C, but is then redirected back to the plenum from the lower intake, then it is NOT entering the combustion chamber, thus reducing the amount of air being sucked in through the MAF - the redirected air is accounted for.

My only concern is that for whatever reason you didn't think that the tube coming from the lower intake somehow is drawing air from the breathers that will be put into the valve covers. As long as that isn't the concern, it should be fine.

 

Any changes in this mod ??? I am going to do it today, Just wondering??

 

I've been following several of these threads and have a somewhat related question.

Oil is sucked up from the valve cover through the PCV and into the plenum under high vacuum conditions, correct?

Is idle or decelerating with the TB butterfly closed high vacuum, or is it the other way around?

 

I am having the same problem with the oil getting into the rubber plenum and plugging up my air filter.
Shouldn't this be covered under the Ford warranty

 

Ford acknowledges that this does occur - but does not acknowlege a "problem" exists - therefore there is "no" warranty fix for this to date. If you do a "search" on here, you'll find hundreds of "posts" over the past 4 years indicating that most of us have this problem and the "multiple" solutions that have been attempted to resolve it.

 

This issue is extremely exagerated. Just clean the intercooler every few years and that take care of it.

Some solutions cause more problems in the long run. Many cars have oil in the intake. This issue has been blown up because many people sell all kinds of junk which most doesn't even work.

Just drive your truck and enjoy it and don't lose sleep over a little oil.

All IMO and experience.

TB

 

I'm just curious, but when putting on the breathers, will you smell oil. I know on my old caprice the breathers on the valve covers at times smell like oil.