Need help with PCV delete

NerdKrusher · Jan 4, 2020

I need some help with deleting my pcv system. I'm pretty familiar with how everything works, I just wanted to hear from people with experience in this area.

Anyway, I want to "remove" my pcv system and reroute the hoses to drain under my car. As well as plug the vacuum ports.

My question is will doing this alow the engine the vent blow by effectively. Or will it leave enough trapped to cause damage.

revhead347 · Jan 4, 2020

No, your engine will not vent properly without a vacuum source to vent the air out, it will leave bad gasses trapped in your engine. It leads to more corrosion, and much for frequent oil changes.

Is this a blower car or something? What is the reason for removing the PCV system?

Kurt

NerdKrusher · Jan 4, 2020

My car is N/A. I want to delete it so my intake stops sucking in blow by and burning it. I don't want to spend $200 on an oil catch can combo.

If it won't work without vacuum. Then how did the old pcv system work before the rerouted it into the intake.

revhead347 · Jan 4, 2020

NerdKrusher said:
My car is N/A. I want to delete it so my intake stops sucking in blow by and burning it. I don't want to spend $200 on an oil catch can combo.

If it won't work without vacuum. Then how did the old pcv system work before the rerouted it into the intake.

I am not sure what you are referring to by the "old pcv system."

Sometimes blower guys delete the PCV system because it's hard to keep the positive manifold pressure from blowing into the crank case. On an NA car there isn't really any reason to do it. The amount of blow by that actually gets sucked into the intake is completely negligible in comparison to the amount of air an engine sucks in. It's not going to make any difference power wise. However, the blow by is significant enough to gently mist stinky white gas from where ever you vent it to. So your car will constantly be emitting this white smoke which is going to make it a really ty place to be when you are sitting in traffic. The PCV system does suck in some oil from the crank case, but an oil seperator is a quick cure for that.

Steeda Mustang Oil Separator (79-20/03-04 Cobra)

Steeda's universal oil separator kit for S550, S197, SN95, and Fox body Mustang reduces detonation, oil burning and deposits on the valves by removing oil drawn through the PCV system before it can contaminate the intake charge. This kit features a clear

www.steeda.com

Kurt

NerdKrusher · Jan 4, 2020

revhead347 said:
I am not sure what you are referring to by the "old pcv system."

Sometimes blower guys delete the PCV system because it's hard to keep the positive manifold pressure from blowing into the crank case. On an NA car there isn't really any reason to do it. The amount of blow by that actually gets sucked into the intake is completely negligible in comparison to the amount of air an engine sucks in. It's not going to make any difference power wise. However, the blow by is significant enough to gently mist stinky white gas from where ever you vent it to. So your car will constantly be emitting this white smoke which is going to make it a really ty place to be when you are sitting in traffic. The PCV system does suck in some oil from the crank case, but an oil seperator is a quick cure for that.

Steeda Mustang Oil Separator (79-20/03-04 Cobra)

Steeda's universal oil separator kit for S550, S197, SN95, and Fox body Mustang reduces detonation, oil burning and deposits on the valves by removing oil drawn through the PCV system before it can contaminate the intake charge. This kit features a clear

www.steeda.com

Kurt

I'm not doing this for adding power. I want to do it so oil won't get sucked into the intake, even if it's a small "insignificant" amount.
I have some experience with deleting it. On a 96 GT we deleted it and have blow by vent into the atmosphere. There is a tiny amount of smelly white smoke that comes out of the vent. It's only noticable when you turn off the car.

When I say old pcv system, I'm referring to when blow by was vented into the atmosphere. It sounds to me like it's the same as what we did with the 96gt.

General karthief · Jan 5, 2020

If your engine is healthy the insignificant amount of 'blowby' ingested into the engine is just that, insignificant. If the engine is worn to the point of noticeable smoke coming from it you need to rebuild or replace it.
To leave the engine to vent to atmosphere is not the way to go, not sure what the reason is here.

Hoytster · Jan 5, 2020

I agree with everything said above, with your N/A setup, you are much better retaining the stock PVC system to utilize the manifold vacuum to help promote crankcase evacuation. Rather then eliminating the stock PCV setup, I would add a DIY oil catch can system. A $20-$30 compressed air oil/water separating, two threaded hose barbs, and some fuel/oil hose and you're g2g with keeping the oil out of your intake.

Even on the new 363 S/C combo I am currently building, I will be doing a full PCV system with dual paths for times when there is manifold vacuum and for times when the manifold sees boost. My old S/C setup used to vent to atmosphere and the amount of oil mist that collected in the engine bay and under the body sucked.

VibrantRedGT · Jan 8, 2020

If it's N/A a breather on the passenger side valve cover is enough vent. If you go this route I would think capping the PCV is fine.

Now if you're forced induction a catch can is ideal. Although I did have to do a catch can on my 347 Stroker. Had oil in the throttle body area and catch can solved that issue.

Looking at pics of my old setups both stock 302 with blower and 347. Had a breather on the blower setup but was also running PCV if I remember correctly. The 347 also had a breather and PCV with catch can.

Untitled by jpjr50, on Flickr

Untitled by jpjr50, on Flickr

NerdKrusher · Jan 9, 2020

VibrantRedGT said:
If it's N/A a breather on the passenger side valve cover is enough vent. If you go this route I would think capping the PCV is fine.

Now if you're forced induction a catch can is ideal. Although I did have to do a catch can on my 347 Stroker. Had oil in the throttle body area and catch can solved that issue.

Looking at pics of my old setups both stock 302 with blower and 347. Had a breather on the blower setup but was also running PCV if I remember correctly. The 347 also had a breather and PCV with catch can.

Untitled by jpjr50, on Flickr

Untitled by jpjr50, on Flickr

Im running a drain tube from the old pcv valve, behind the intake manifold to the ground. This is how the old crankcase system was in cars. Do you think that would be fine for forced induction?

General karthief · Jan 9, 2020

No. Unless you want to coat the bottom of your car with oily crap.
and just so you know, those road tubes (I believe that was what they where called) did not work below 30 mph

VibrantRedGT · Jan 10, 2020

I would not be happy driving behind you with oil splatter on my windshield.

Put that drain in some sort of can, jar, bottle or whatever you can find. Just put a hose fitting on it and that's where the oil will land.

I've seen cool catch cans in engine bays, vintage oil cans, old glass jars, alcohol bottles (Jim Beam, Jack, beer bottles, etc.). Just cap off the tap and vacuum hose connection.

96pushrod · Jan 10, 2020

revhead347 said:
I am not sure what you are referring to by the "old pcv system."

Sometimes blower guys delete the PCV system because it's hard to keep the positive manifold pressure from blowing into the crank case. On an NA car there isn't really any reason to do it. The amount of blow by that actually gets sucked into the intake is completely negligible in comparison to the amount of air an engine sucks in. It's not going to make any difference power wise. However, the blow by is significant enough to gently mist stinky white gas from where ever you vent it to. So your car will constantly be emitting this white smoke which is going to make it a really ty place to be when you are sitting in traffic. The PCV system does suck in some oil from the crank case, but an oil seperator is a quick cure for that.

Steeda Mustang Oil Separator (79-20/03-04 Cobra)

Steeda's universal oil separator kit for S550, S197, SN95, and Fox body Mustang reduces detonation, oil burning and deposits on the valves by removing oil drawn through the PCV system before it can contaminate the intake charge. This kit features a clear

www.steeda.com

Kurt

These Steeda separators work pretty damn well. I run one in a high-ish compression street engine and it works great.

Need help with PCV delete

NerdKrusher

Member

revhead347

Apparently my ex-husband made that mistake.

NerdKrusher

Member

revhead347

Apparently my ex-husband made that mistake.

Steeda Mustang Oil Separator (79-20/03-04 Cobra)

NerdKrusher

Member

Steeda Mustang Oil Separator (79-20/03-04 Cobra)

General karthief

wonder how much it would cost to ship you a pair

Hoytster

I don't dare do that to my Knob

VibrantRedGT

"STANGNET'S PENGUIN SMACKER"

NerdKrusher

Member

General karthief

wonder how much it would cost to ship you a pair

VibrantRedGT

"STANGNET'S PENGUIN SMACKER"

96pushrod

I think they're a little easier to get off

Steeda Mustang Oil Separator (79-20/03-04 Cobra)

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Need help with PCV delete

Member

Apparently my ex-husband made that mistake.

Member

Apparently my ex-husband made that mistake.

Member

wonder how much it would cost to ship you a pair

I don't dare do that to my Knob

"STANGNET'S PENGUIN SMACKER"

Member

wonder how much it would cost to ship you a pair

"STANGNET'S PENGUIN SMACKER"

I think they're a little easier to get off

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