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A small mod that made a big difference...


CrzyHorse
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Here is a little mod I learned that requires only a few small parts and makes a difference. Basically we took out the oil cap and put a breather on it. That freed up some of the stress on the engine. Then we took out the both sides of the pcv and put a pcv breathers on each side. We plugged the opening on the intake and the supercharger with vacuum plugs. It really makes a difference on higher revs once we made it past roughly 4000 rpm the pull was significantly more and the supercharger screams.

Edited by CrzyHorse
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WOOO HOOO, that sounds like a great mod...pics and parts brother, pics and parts...

 

Well hurry it up festus!!!!

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Hope these pictures help. We left the original lines on it because they did not have the breathers for it. It function the same as the other side is unplugged, so it lets the air out that way.The oil breather we got from Autozone. It is ridiculous how different it is. I put it on the freeway and it pulls like hell. I lost traction just punching to the point where the car went sideways in second, something that never happened before. The difference is very noticeable. I would recommend it to anyone. There is no harm to the engine because those are just there to circulate the air back in to get used. Like this it does not go back keeping the engine and supercharger cooler.

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Here is a little mod I learned that requires only a few small parts and makes a difference. Basically we took out the oil cap and put a breather on it. That freed up some of the stress on the engine. Then we took out the both sides of the pcv and put a pcv breathers on each side. We plugged the opening on the intake and the supercharger with vacuum plugs. It really makes a difference on higher revs once we made it past roughly 4000 rpm the pull was significantly more and the supercharger screams.

I'm not sure this is a good idea. The PCV system is designed to apply metered vaccum to the crankcase in a small amount to remove unwanted gasses and vapors that build up. Without this system, that can't happen. Before we had this system, the old cars used to use a draft tube to vent these crankcase blowby vapors to the atmosphere. Of course thats a smog maker so we use the PCV system now to reburn the blowby vapors and vent them back into the intake tract. Anyway, these vapors need to be removed to avoid sludge and other harmful effects. By disabling the PCV system, the blowby vapors can't escape the crankcase unless they passively rise to the top of the valve covers, which isn't very efficient. Without the PCV system, the crankcase is not being vented with fresh air and blowby is not being removed.

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That makes alot of sense,I recently sent off an oil sample and the viscosity was down to 30 weight and there was also 2% fuel found in the oil-Thats with about 1800 miles on the Ford 5W-50 oil.And I havent done anything to the PCV (Positive Crankcase Ventilation) system.You may want to do an oil analysis after the next oil change to see whats been affected.

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This is interesting, I am courious as to where that extra power is coming from. The PCV system should not have that much effect on HP. Sure, it is a metered leak into the intake consisting of "crankcase vapors" that are made up of some blow-by gasses that are basicly exaust gases and pretty much inert so that portion of the "vapors" is of no use for making power but the rest of it is gas and oil vapors which can combust.....well maybe in a SC'ed application it can have a signifigant effect on output?!?!

 

Better check your tune, unmetered air will get in and LEAN you out. Probably why it 'feels' better. But I bet your A/F is off now.

 

I agree that he should check his A/F as it could be off but where would the unmetered air be entering? The 2 PVC ports on the intake have been blocked off.

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This is interesting, I am courious as to where that extra power is coming from. The PCV system should not have that much effect on HP. Sure, it is a metered leak into the intake consisting of "crankcase vapors" that are made up of some blow-by gasses that are basicly exaust gases and pretty much inert so that portion of the "vapors" is of no use for making power but the rest of it is gas and oil vapors which can combust.....well maybe in a SC'ed application it can have a signifigant effect on output?!?!

 

 

 

I agree that he should check his A/F as it could be off but where would the unmetered air be entering? The 2 PVC ports on the intake have been blocked off.

 

Exactly what I was thinking how would it throw off any air fuel ratio as 2kgt281 said that the areas that would change the air intake have been blocked off. It is essentially functioning the same way minus the vapors being returned back into the engine.

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I'm not sure this is a good idea. The PCV system is designed to apply metered vaccum to the crankcase in a small amount to remove unwanted gasses and vapors that build up. Without this system, that can't happen. Before we had this system, the old cars used to use a draft tube to vent these crankcase blowby vapors to the atmosphere. Of course thats a smog maker so we use the PCV system now to reburn the blowby vapors and vent them back into the intake tract. Anyway, these vapors need to be removed to avoid sludge and other harmful effects. By disabling the PCV system, the blowby vapors can't escape the crankcase unless they passively rise to the top of the valve covers, which isn't very efficient. Without the PCV system, the crankcase is not being vented with fresh air and blowby is not being removed.

 

As you said on older cars they used to have a tube that would raise it to the environment. Essentially this is the same thing the whole unit is there but instead of being recirculated back into the engine it is let out into the atmosphere via the breathers. I am fairly sure it wont pass smog but putting it on is about a 1 second job. Just click the tubes back in place and tighten your oil cap and you are back in action.

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I would also block off those tube openings, with those open to the crankcase and no filter to catch the vapors exiting, it could make the breather useless because the exiting vapors will follow the path of least resistance, and the breather has more resistance (a little bit)than the open tubes and could make a mess under the hood.

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let me see if i can explain it better.... the pcv is not exactly disabled, it is just not vented back into the motor where it brings the intake temp down, it goes just into the air...and as far as the a/f ratio being off. cmon guys its common sense, there is no air going into the combustion chamber from the pcv or oil filter, if that was the case, a vacuum leak would cause the car to not even idle, un metered air is air thats is making its way to the combustion chamber, and your pcv system and oil cap filter are way passed that....it is actually healthy for the motor, because you are releasing pressure from the engine specially under that boost, i have a buddy who had it on his n/a gt, and ran it that way for about 2 years, didn't really help him in performance that much but did help his motor work less to make the same amount of power, never once did he have a problem. if you guys have anymore questions let me know

Edited by CrzyHorse
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let me see if i can explain it better.... the pcv is not exactly disabled, it is just not vented back into the motor where it brings the intake temp down, it goes just into the air...and as far as the a/f ratio being off. cmon guys its common sense, there is no air going into the combustion chamber from the pcv or oil filter, if that was the case, a vacuum leak would cause the car to not even idle, un metered air is air thats is making its way to the combustion chamber, and your pcv system and oil cap filter are way passed that....it is actually healthy for the motor, because you are releasing pressure from the engine specially under that boost, i have a buddy who had it on his n/a gt, and ran it that way for about 2 years, didn't really help him in performance that much but did help his motor work less to make the same amount of power, never once did he have a problem. if you guys have anymore questions let me know

 

Without the pcv vacuum source connected, the blowby gasses are not being moved out of the crankcase. Crankcase pressure might excape the small filters you placed on top the valve cover, but that's totally passive. A pcv system is better since it actually moves fresh air into the crankcase to displace the blowby gasses. Fresh air enters the left valve cover, and exits the right valve cover at the pcv valve where it is piped into the supercharger intake side for a vacuum source. Accumulation of blowby gasses in the crankcase causes acids in the oil to build up and promotes oil sludge. It might run ok, but there is a definite advantage to having a pcv system. It promotes clean oil/engine by removing blowby gasses and also serves to keep crankcase pressure low by applying a small vacuum source.

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Without the pcv vacuum source connected, the blowby gasses are not being moved out of the crankcase. Crankcase pressure might excape the small filters you placed on top the valve cover, but that's totally passive. A pcv system is better since it actually moves fresh air into the crankcase to displace the blowby gasses. Fresh air enters the left valve cover, and exits the right valve cover at the pcv valve where it is piped into the supercharger intake side for a vacuum source. Accumulation of blowby gasses in the crankcase causes acids in the oil to build up and promotes oil sludge. It might run ok, but there is a definite advantage to having a pcv system. It promotes clean oil/engine by removing blowby gasses and also serves to keep crankcase pressure low by applying a small vacuum source.

 

nicely said but thats y i have a oil cap filter, so whatever blow by that doesnt get released from the open pcv tubes will whether you like it or not escape from my oil cap which has a filter on it (another words open to the atmosphere), as for the oil cap passage way has a direct path to the crank case. Make sense?

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Here is a little mod I learned that requires only a few small parts and makes a difference. Basically we took out the oil cap and put a breather on it. That freed up some of the stress on the engine. Then we took out the both sides of the pcv and put a pcv breathers on each side. We plugged the opening on the intake and the supercharger with vacuum plugs. It really makes a difference on higher revs once we made it past roughly 4000 rpm the pull was significantly more and the supercharger screams.

 

I like this idea. You said in explaination: Put on PCV breathers on each side. I'm not real mechanical, what do you mean by PCV "Breathers"? Is breathers something that clips on the ends of the tubes?

 

Steve

AZ

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Metco makes a PCV adapter for our cars...

PCV1000.jpg

 

From their website:

"This cleverly-engineered adapter is designed to replace the OEM PCV valve adapter found on the passenger side valve cover in the Cobra & GT500 applications.

 

It installs as a direct replacement for the original part and even uses the same mounting fasteners. The adapter housing is CNC-machined from billet aluminum and contains a modified 2003/2004 Mustang Cobra PCV valve (included). The hex-headed insert threads into the housing and features 3/8" NPT thread to accept the AN fitting of your choice.

 

This kit is designed for users building a custom PCV system to better manage crank case pressures in high boost applications."

Edited by chimazo
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Give it a month. You'll be cleaning your engine bay. Breathers will blow oil out and it will smell like burnt oil. Bad enough to smell it inside of your car. PCV system is a good way to evacuate the crank case. Unless you running 20+ LB's of boost. I wouldn't go to breathers only. I good race system uses exhaust system to evacuate the crank case. That system comes with two sealed breathers, fittings, and hoses that run down to you header collectors. Been a lot of opinions on this over the years. I found the stock system with a catch can works best. That's just my opinion.

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nicely said but thats y i have a oil cap filter, so whatever blow by that doesnt get released from the open pcv tubes will whether you like it or not escape from my oil cap which has a filter on it (another words open to the atmosphere), as for the oil cap passage way has a direct path to the crank case. Make sense?

Nope.

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I have to chime in on this as well...

 

The PCV system is an emissions item only, it serves no other purpose than to please the tree huggers. It actually hurts performance by putting hot gasses back into the intake tract, not to mention oil mist. By adding breathers, the cooler intake temps may be where some of the extra power is coming from. The crank case will vent just fine with breathers in place. Unfortunately the only drawback might be some escaping oil vapor in the engine bay. Also, this prevents that oil from getting inside the intake manifold and making sludge. Any oil vapor in the intake charge can lead to a lean condition. Breathers and/or a catch can remedy this problem. There is no possible way that unmetered air can make its way into the intake tract and lean things out. If this IS the case, you have bigger problems to think about. There is only benefit to this mod and zero risk if done properly.

 

DS

Edited by DarkShadow
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I have to chime in on this as well...

 

The PCV system is an emissions item only, it serves no other purpose than to please the tree huggers. It actually hurts performance by putting hot gasses back into the intake tract, not to mention oil mist. By adding breathers, the cooler intake temps may be where some of the extra power is coming from. The crank case will vent just fine with breathers in place. Unfortunately the only drawback might be some escaping oil vapor in the engine bay. Also, this prevents that oil from getting inside the intake manifold and making sludge. Any oil vapor in the intake charge can lead to a lean condition. Breathers and/or a catch can remedy this problem. There is no possible way that unmetered air can make its way into the intake tract and lean things out. If this IS the case, you have bigger problems to think about. There is only benefit to this mod and zero risk if done properly.

 

DS

That's why you put some sort of filter inline to prevent the oil, in around 2,000 miles i have drained about a 1/2 cups worth.

DSC01056s.jpg

You can see the blue filter.

There are other posts on here about it.

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im glad at least a few people agree with me in here lol... this is a great cheap mod that will cause no harm to your motor.....so far the car has been running great no problems, and its faster

 

Looked around for that oil cap/filter arrangement also. Appreciate if you could post the source and part number. This is a great mod and makes sense to me.

 

Steve

AZ.

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Just surf any 05+ forum about this. You will get all kind of catch can applications and so on. Also some heated debates about bypassing the PCV system. I did it and got oil running from the filter on the oil filler neck. Over time oil vapor builds up in the filter and begins to run down the valve cover. There is a lot of concern over oil residue building up in the intake.

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