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  1. #26
    FEP Power Member Ourobos's Avatar
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    True, see post # 6.. LOL
    03 Redfire Cobra
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    86 Mustang Coupe LX T-top

  2. #27

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    Quote Originally Posted by David Claflin View Post
    If you're using an open breather with a PCV on an EFI system, be advised you're drawing air into the engine that is not being metered by the mass air meter which could lead to lean fuel stumble or other issues that contribute to poor operation.
    Quote Originally Posted by Ourobos View Post
    True, see post # 6.. LOL
    You guys must have missed the part where I mentioned that I am plugging the drivers side valve cover. The other valve cover I plan on tying into the TB for vaccuum. I am aware of unwanted, unmetered air and it's affects on the ECU...just wondering if he had noticeable amounts of oil pulled through his intake. I should also mention that I am running a tall valve cover c/w baffles. Again, no PCV here and no breathers either.
    1986 Capri RS w/ FRPP Z347BOSS crate

    2011 F-150 SCREW ecoBoost FX4

  3. #28
    FEP Power Member Ourobos's Avatar
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    That's the way ford did it stock from 86 up... Nothing in drivers side, close. Passenger side filler neck has a tube to vent back to behind the throttle body. I'd run the PCV with it though since it's now a closed system.
    03 Redfire Cobra
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  4. #29

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    No provision on the Victor EFI for a PCV.
    1986 Capri RS w/ FRPP Z347BOSS crate

    2011 F-150 SCREW ecoBoost FX4

  5. #30
    FEP Power Member Ourobos's Avatar
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    Well, without the PCV provision, you should run a breather in each cover. Otherwise, you're creating excess crank pressure with the vacuum you're pulling into the TB.

    I just built a 306 for a customer, TFS heads, Anderson N41 cam, and the Victor EFI intake. Put a breather on each valve cover. The engine makes a good 400hp by the seat-o-pants dyno, and runs like a top, no smoke, excess oiling, etc. Just my opinion on what you should do. Good luck.
    03 Redfire Cobra
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    00 Roush Stage 2
    86 Mustang Coupe LX T-top

  6. #31

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    Quote Originally Posted by Ourobos View Post
    Well, without the PCV provision, you should run a breather in each cover. Otherwise, you're creating excess crank pressure with the vacuum you're pulling into the TB.

    I just built a 306 for a customer, TFS heads, Anderson N41 cam, and the Victor EFI intake. Put a breather on each valve cover. The engine makes a good 400hp by the seat-o-pants dyno, and runs like a top, no smoke, excess oiling, etc. Just my opinion on what you should do. Good luck.
    Appreciate your feedback. Yeah, tough call on this as there is a TON of debate on FEP on what way to go about it. I spoke with Ray at FRPP Tech a couple of times on this and he reccommended to plug the drivers side cover and he was aware I was running a Victor w/ NO PCV. Yet so many people run the 2 breathers....

    I wonder how much affect it would really have on the ECU if I vented that drivers' side cover and drew in that unmetered air though? Would I be able to notice this on start-up (is it something I could try in the garage when I start this thing up this weekend) or will I need to be at various RPM's and under WOT to notice the difference?

    And how much excess crankcase pressure are we talking here? Enough that I should be worried about or is there really a way to determine? Why would Edelbrock design this manifold without provision for PCV....is it because it is a racing manifold designed to run at higher RPM's? They must have had something in mind when they deleted it from the manifold.
    1986 Capri RS w/ FRPP Z347BOSS crate

    2011 F-150 SCREW ecoBoost FX4

  7. #32
    FEP Power Member Ourobos's Avatar
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    You running mass air or speed density?

    Enough crank pressure to blow some seals out, seen it happen a few times.


    The Victor EFI is technically a 'race' intake, I think they intended it for breathers IMHO.
    03 Redfire Cobra
    03 Marauder 300a
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    86 Mustang Coupe LX T-top

  8. #33

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    When I first got mine together with the Victor EFI I ran it as-is for a quick blast around the block to make sure all was ok...this was with the stock oil fill cap on - so NO breather, no PCV - nothing! lol. Well only a couple miles and the oil started to get foamy - it scared me I thought I had blown the head-gasket - but it was just from not having a breather...I've since upgraded to two drivers side valve covers with K&N screw on breathers. No issues - car runs fine and the oil is fine!






  9. #34
    FEP Power Member Ourobos's Avatar
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    Looks sweet too.
    03 Redfire Cobra
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    86 Mustang Coupe LX T-top

  10. #35

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    Quote Originally Posted by n20capri View Post
    When I first got mine together with the Victor EFI I ran it as-is for a quick blast around the block to make sure all was ok...this was with the stock oil fill cap on - so NO breather, no PCV - nothing! lol. Well only a couple miles and the oil started to get foamy - it scared me I thought I had blown the head-gasket - but it was just from not having a breather...I've since upgraded to two drivers side valve covers with K&N screw on breathers. No issues - car runs fine and the oil is fine!






    Spot on Mike! Shoulda thought of you earlier as we are running very similar setups..glad to hear that worked out for you. Are you pulling a vacuum at all from the crankcase or did you just plug the vacuum line from the throttle body after? Looks like the latter as those K&N's don't look like they have a vacuum take-off??

    Love that motor too, looks great!
    1986 Capri RS w/ FRPP Z347BOSS crate

    2011 F-150 SCREW ecoBoost FX4

  11. #36
    FEP Power Member Ourobos's Avatar
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    FYI on the one I was talking about earlier, it had no vacuum line, and pulled 20 in/hg at idle.. I used the same K&Ns. I was impressed.
    03 Redfire Cobra
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  12. #37

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    No vacuum line at the TB either...I have a huge cam so I'm not seeing much vacuum...maybe 6in/hg! lol

  13. #38
    FEP Senior Member David Claflin's Avatar
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    Quote Originally Posted by Ourobos View Post
    Well, without the PCV provision, you should run a breather in each cover. Otherwise, you're creating excess crank pressure with the vacuum you're pulling into the TB.
    Care to explain this?
    1990 Red LX, GT40 junk, ported truck lower, box upper, 1 3/4 long accufabs, 3" exhaust, T5, 4.10, lightened up some, track times coming.


    1985 LTD LX, 302, Ported TFS TW's, 80MM-R TB, ported holley SMII, 1 3/4 longtubes, 3" exhaust, 4R70W Baumann Optishift, 3800 stall, Mach1 brakes, 16" Ford police car wheels. 7.92@86MPH, 3640 pounds with 1/4 tank of gas and me in it.

  14. #39
    FEP Power Member Ourobos's Avatar
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    Sounds pretty straight forward to me. Familiar with Ford engineering on the way they have the PCV setup? What would you like broken down?
    03 Redfire Cobra
    03 Marauder 300a
    00 Roush Stage 2
    86 Mustang Coupe LX T-top

  15. #40
    FEP Senior Member David Claflin's Avatar
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    Quote Originally Posted by Ourobos View Post
    Sounds pretty straight forward to me. Familiar with Ford engineering on the way they have the PCV setup? What would you like broken down?
    Yes, very. The tube from the TB to the valve cover is where the PCV system sources air that has been metered, to go through the crankcase and then into the intake via the PCV. What are you talking about when you say crank pressure, are you talking about during cranking as in engine start, or during WOT? Not looking for an argument, just want to make sure of what you're saying so it won't be misconstrued.
    1990 Red LX, GT40 junk, ported truck lower, box upper, 1 3/4 long accufabs, 3" exhaust, T5, 4.10, lightened up some, track times coming.


    1985 LTD LX, 302, Ported TFS TW's, 80MM-R TB, ported holley SMII, 1 3/4 longtubes, 3" exhaust, 4R70W Baumann Optishift, 3800 stall, Mach1 brakes, 16" Ford police car wheels. 7.92@86MPH, 3640 pounds with 1/4 tank of gas and me in it.

  16. #41
    FEP Power Member Ourobos's Avatar
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    On a MAF system, yes pretty much.. And actually the PCV pulls pressure OUT of the lower end of the motor into the upper intake, not from upper into lower. The 'fresh air' is vented from the valve cover tube into the upper past the throttle body. If you have one and not the other, the system would be unbalanced. That's what I'm saying in a nutshell. Seems like what you are saying too once I read it a few times.
    03 Redfire Cobra
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  17. #42
    FEP Super Member SVT Rob's Avatar
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    The only issue I have with running dual breathers, is I get a fine spray of oil mist at higher RPM's. When I get my car all back together, I'll be putting a PCV back on it.

  18. #43
    FEP Power Member Ourobos's Avatar
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    I'm with you, I try to keep it like Ford engineered it.
    03 Redfire Cobra
    03 Marauder 300a
    00 Roush Stage 2
    86 Mustang Coupe LX T-top

  19. #44

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    I ran a two breather set up...lines capped off and breather on passenger cover with the PCV setup being a breather as well. I had oil mist issues as well...went back to stock PCV set up and running Boss 302 1970 PCV valve since I have bigger cam with only 6-8" of vacuum. Runs great and no oil issues...rear main quit dripping too. Garage floor nice and dry....
    85 GT Vert' (CFI converted to EFI), 306 TFS 170's, Systemax II, Lunati cam, 8.8 w/3.73, Ford Racing T-5, AFM Powerpipe
    317 rwhp 304 rwtq

  20. #45

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    Quote Originally Posted by QisJob1 View Post
    I ran a two breather set up...lines capped off and breather on passenger cover with the PCV setup being a breather as well. I had oil mist issues as well...went back to stock PCV set up and running Boss 302 1970 PCV valve since I have bigger cam with only 6-8" of vacuum. Runs great and no oil issues...rear main quit dripping too. Garage floor nice and dry....
    Would having a tall(er) valve cover with baffles in it prevent / cut down on the oil mist? Or is the mist an inherent side effect of using 2 breathers?

    Mike, are you getting any mist on your setup?
    1986 Capri RS w/ FRPP Z347BOSS crate

    2011 F-150 SCREW ecoBoost FX4

  21. #46
    FEP Super Member SVT Rob's Avatar
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    The mist is inherent in having 2 breathers. Without having a positive crankcase ventilation (PCV) system in place, it blows out the breathers. I'm running the Ford Racing tall valve covers with baffles, and this is an issue I still have. It's not as bad as it was with the stock Powered by Ford covers, but it's evident as I have an oil layer on the firewall that I painted before moving to Florida.

  22. #47
    FEP Senior Member David Claflin's Avatar
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    Quote Originally Posted by Ourobos View Post
    And actually the PCV pulls pressure OUT of the lower end of the motor into the upper intake, not from upper into lower. The 'fresh air' is vented from the valve cover tube into the upper past the throttle body.
    RIght, I didn't say otherwise. Most cars from the factory will have 3-4" of vacuum in the intake system at WOT due to restrictive intake or throttle body. When the rings are in good shape this vacuum allows for a small bit of vacum in the crankcase. Once you put bigger throttle bodies/carb on this removes the restriction and you get less vacuum at WOT, this is what causes oil to be pushed out of the breathers. Of course if your rings are shot then the 3-4" of vacuum won't be enough to overcome what is being pushed into the crankcase past the rings. I ran a vacuum pump on my car, it would pull 12" of vacuum at the shift point. It ran faster at the track with it on, and actually helped the mileage during cruise, but I could never come up with a way to stop it from sucking oil into the pump.
    1990 Red LX, GT40 junk, ported truck lower, box upper, 1 3/4 long accufabs, 3" exhaust, T5, 4.10, lightened up some, track times coming.


    1985 LTD LX, 302, Ported TFS TW's, 80MM-R TB, ported holley SMII, 1 3/4 longtubes, 3" exhaust, 4R70W Baumann Optishift, 3800 stall, Mach1 brakes, 16" Ford police car wheels. 7.92@86MPH, 3640 pounds with 1/4 tank of gas and me in it.

  23. #48
    FEP Supporter PaceFever79's Avatar
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    Quote Originally Posted by SVT Rob View Post
    The mist is inherent in having 2 breathers. Without having a positive crankcase ventilation (PCV) system in place, it blows out the breathers. I'm running the Ford Racing tall valve covers with baffles, and this is an issue I still have. It's not as bad as it was with the stock Powered by Ford covers, but it's evident as I have an oil layer on the firewall that I painted before moving to Florida.
    IMO... another reason to run a PCV... the engine bay stays much cleaner!

  24. #49
    FEP Super Member SVT Rob's Avatar
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    Quote Originally Posted by PaceFever79 View Post
    IMO... another reason to run a PCV... the engine bay stays much cleaner!
    Yea, now that I painted my engine bay, it pains me to see the oil residue. The oil residue has the added feature of trapping any dust/moisture that gets into the engine bay, and quickly makes it look terribad nasty.

    I worked so hard to clean up the engine bay and make it neat. The ONLY car I've ever done that to. When I reassemble the car, I'll be putting a PCV system back on it.

  25. #50
    FEP Power Member Ourobos's Avatar
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    How fresh is the engine's bottom end? How about a catch can system?
    03 Redfire Cobra
    03 Marauder 300a
    00 Roush Stage 2
    86 Mustang Coupe LX T-top

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