PCV Delete... - Page 2

Sendero · 01-20-2005, 07:44 PM

Quote:

Originally Posted by Wicked

No I don't think so, if vacuum seals the rings and normal driving combustion(1000psi) doesn't, then how could boosted combustion(2500psi) seal them?

We should look it up.

Nope, I already know the answer which is why I run my PCV system.

QWKSNKE · 01-20-2005, 08:29 PM

I did the same as Wicked. For quite a few miles I ran my car without the pcv system. Had to go back to it because of all the blow by and oil that was coming out of my mini breather had stuck in it.

No harm in running without it. Doesn't cause any vacuum leaks, etc.

Sendero · 01-20-2005, 08:39 PM

I wonder if there is a way to run some type of remote oil seperator that drains back into the oil pan? Even better if you run an oil drainback for the supercharger, you could just piggyback off that system.

QWKSNKE · 01-20-2005, 08:52 PM

In a good sealing motor, there wouldn't be enough oil to worry about it.

slvrbullit · 01-21-2005, 04:13 AM

Quote:

Originally Posted by Wicked

PCV does not use vacuum, it uses "ventilation".

Not trying to highjack or get any fires going here but If the PCV does not use vacuum, then how come when you remove the valve with the car running and place your finger over the valve hole there is enough vacuum to suck your finger to the hole?

EZ SPEED · 01-21-2005, 04:52 AM

This topic has been argued about 1,000,000 times on F150online.com with no real results.

I run a 03 Cobra PCV valve and the "dime" mod on one of my lines to restrict the flow under boost and I still get a little oil in the intake, but not as much as other people.

Wicked · 01-21-2005, 04:00 PM

Quote:

Originally Posted by slvrbullit

Not trying to highjack or get any fires going here but If the PCV does not use vacuum, then how come when you remove the valve with the car running and place your finger over the valve hole there is enough vacuum to suck your finger to the hole?

Tommy,
I'm not saying it doesn't use a vacuum source, i am saying the crankcase is not under negative pressure. It only uses to vacuum source to create an airflow....thats why they call it ventilation.
Yes, if you disconnect the "high" side and feel the hole it will create a vacuum, but that side is not normally plugged. It is open to your metered air source BEFORE your throttle body. I tried plugging the pass. side and leaving the driver side hooked up to the vacuum but the engine vacuum cause some of my seals on the front of the motor to start "singing" as they created vacuum leaks.

As far as how to run a drainback, you could always connect a hose to your dipstick tube.

And I found out about the vacuum pump for ring sealing in racing. The general rule is a max of 12 inches of mercury...more than that and you need special seals, specifically intake end seals or you will suck them in...they sale valves to limit vacuum in the crankcase. He said his normally reads 3 inches or so, but 0 at WOT.

Wicked · 01-21-2005, 04:01 PM

Quote:

Originally Posted by Sendero

Nope, I already know the answer which is why I run my PCV system.

Whatever you say!

QWKSNKE · 01-21-2005, 04:57 PM

Quote:

Originally Posted by slvrbullit

Not trying to highjack or get any fires going here but If the PCV does not use vacuum, then how come when you remove the valve with the car running and place your finger over the valve hole there is enough vacuum to suck your finger to the hole?

because the other side is under vacuum.

Like Wicked said, the crankcase is under positive pressure.

slvrbullit · 01-21-2005, 09:15 PM

Cool just gettin the info straight in my head is all.

01-20-2005, 08:29 PM	#12
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	Re: PCV Delete... I did the same as Wicked. For quite a few miles I ran my car without the pcv system. Had to go back to it because of all the blow by and oil that was coming out of my mini breather had stuck in it. No harm in running without it. Doesn't cause any vacuum leaks, etc. __________________ 2009 Porsche Carrera S 2008 ///AMG C63.. Eurocharge Tune. RIP 2019 AMG GLC43..wife's 03 F250 SD.. Edge Evo, AFE Stage 1 CAI 08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's 01 Cobra vert... wife's I need a new toy

01-20-2005, 08:39 PM	#13
Sendero Im gonna show her my... Join Date: Dec 2004 Location: Somewhere providing FREE tech support. Posts: 4,269	Re: PCV Delete... I wonder if there is a way to run some type of remote oil seperator that drains back into the oil pan? Even better if you run an oil drainback for the supercharger, you could just piggyback off that system. __________________ I heard it on the internet, so it must be true. "I believe that a person's moral compass can be determined by how he references free men the right to defend themselves." T. Nugent "An armed society is a polite society. Manners are good when one may have to back up his acts with his life." R. Heinlein "Never argue with an idiot. They drag you down to their level, then beat you with experience." -Unknown

01-20-2005, 08:52 PM	#14
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	Re: PCV Delete... In a good sealing motor, there wouldn't be enough oil to worry about it. __________________ 2009 Porsche Carrera S 2008 ///AMG C63.. Eurocharge Tune. RIP 2019 AMG GLC43..wife's 03 F250 SD.. Edge Evo, AFE Stage 1 CAI 08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's 01 Cobra vert... wife's I need a new toy

01-21-2005, 04:52 AM	#16
EZ SPEED Friends Join Date: Dec 2004 Location: Tempe Arizona Posts: 3,029	Re: PCV Delete... This topic has been argued about 1,000,000 times on F150online.com with no real results. I run a 03 Cobra PCV valve and the "dime" mod on one of my lines to restrict the flow under boost and I still get a little oil in the intake, but not as much as other people. __________________ 2020 Range Rover Sport HSE P525 Dynamic - Firenze Red - Supercharged 5.0 - 518 HP SOLD - 2010 Camaro SS [/B] - Featured in GM High Tech Performance and Camaro Now Magazines - http://www.superchevy.com/features/g...of-perfection/

01-21-2005, 09:15 PM	#20
slvrbullit Super Moderator Join Date: Dec 2004 Location: on the water Posts: 1,280	Re: PCV Delete... Cool just gettin the info straight in my head is all. __________________ 2012 Jeep Wrangler Unlimited--- too many mods to list, about to be sitting on 1 ton axles. 2000 Ford F-350 Dually Lariat LE Crew Cab Short Box 7.3 auto 168,000 miles