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4G63T Head oil port mod

Posted by BogusSVO, Jul 1, 2009

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  1. BogusSVO

    BogusSVO Proven Member

    5,711
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    Joined Jul 1, 2009
    Pensacola, Florida
    4G63T Head Oil Port Modification


    This is a simple and effective mod done to the oil port from block to head.

    I have found out a restriction can occur when excessive milling of the head has been done.
    Resulting in low/poor oil flow through the cylinder head that can cause lifter tic, cam tower gaulding, and in some cases on turbo engines that feed the turbo oil from a port on the head, to cause the turbo to fail.

    Appox mod time with head of engine is 2 mins.


    Stock oil port….

    DSCF3922.jpg


    Take a die grinder with an aluminum burr and grind and chamfer the oil port, while staying inside the gasket-sealing ring. (I find a ¾ base tree burr works best)

    So the end result looks like this.

    DSCF3926-1.jpg

    I prefer this to be done before the head is resurfaced.

    I hope you find this useful.
     

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    Last edited: Dec 2, 2012
  2. BogusSVO

    BogusSVO Proven Member

    5,711
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    Joined Jul 1, 2009
    Pensacola, Florida
    I am new here, and I do not even own a DSM, But I do machine work for some guys that do have them, we have found this mod very useful, I hope you will too.

    since I am a Noob.. and likely will be for some time, i will post here.

    Mods if you feel the need to move any of my post to a more apporpate fourm, Please do.
    All I wish to do is share what I have learned about your heads and engines
     
  3. rbwtrans

    rbwtrans Proven Member

    219
    1
    Joined Sep 3, 2006
    pensacola, Florida
    This is the guy that has done all of my heads. This mod kills the lifter tick! Tell your machinist to do this. Milling the head reduces the oil flow to the upper end. This restores proper oil flow to your head (and your turbo 1g guys)!
     
  4. fwdmaster

    fwdmaster Proven Member

    1,046
    7
    Joined Aug 15, 2007
    San Diego, California
    Great mod idea BogusSVO :thumb:,I'm doing this on my next build
     
    My DSM:
    1995 Eagle Talon TSi

    Street Build

    16g   manual
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  5. turbotalon1g

    turbotalon1g Proven Member

    798
    29
    Joined Oct 19, 2005
    Blaine, Minnesota
    Any input from those that have machined these motors or put them together?
     
    My DSM:
    1991 Eagle Talon TSi AWD

    Drag Race Build

    11.333 @ 119.94 MPH
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  6. xsboost

    xsboost Proven Member

    233
    2
    Joined Apr 21, 2008
    New Bern, North Carolina
    Nice! I'm glad you posted this before I put my head back on.
     
  7. AWD_Hybrid

    AWD_Hybrid Proven Member

    174
    2
    Joined Apr 1, 2009
    Sydney, Australia
    Thanks for the tip :thumb:
    Cheers !
     
  8. xsboost

    xsboost Proven Member

    233
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    Joined Apr 21, 2008
    New Bern, North Carolina
    I already did my head, started as soon as I read the post. :D
     
  9. Jeff99GS

    Jeff99GS Proven Member

    1,382
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    Joined Jun 27, 2006
    Cleveland, Ohio
    I never understood why that valley was there...I mean that is a HEAD BOLT hole...but obviously oil flows around the bolt and into the head or something!?!

    Awesome Idea Man!!
     
    My DSM:
    1997 Eagle Talon TSi AWD

    12.577 @ 113.020 MPH
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  10. delta448

    delta448 DSM Wiseman

    2,779
    64
    Joined Jan 13, 2006
    Waynesburg, Pennsylvania
    Welcome to the site BogusSVO!
    It's great to have another experienced machinist on board, they're few and far between. I hope you'll post frequently and in detail.

    Have you seen or done the oil pump front "bypass" mod? Opinion on it? Any other headwork tips other than the usual oil drainback and flash cleanup?
     
    My DSM:
    1997 Eagle Talon TSi AWD (sold)

    14b   manual
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  11. BogusSVO

    BogusSVO Proven Member

    5,711
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    Joined Jul 1, 2009
    Pensacola, Florida
    TurboTalon ..... ask rbwTrans... he's my bud, every one of his heads has this done, along with another guy here local that runs dirt track "stinger class"

    the reason this mod came about was Rick was having a problem with lifter tic, and after he swapped out lifters, 3 times, including to the updated 3g ones, it just would not go away, the head came off and we noticed that the passage from the block to the head had gotten smaller from the head bein surfaced several times, I ground the passage, and Rick bolted the head back on, and the lifter tic was gone, Ever since I have done this mod on EVERY 4G63 head that has passed through my shop. (aprox 30 or so)
    I have not had one ill report back on it. But several calls telling me lifter tic was now gone.

    Yes I do plan to do some more "how to" post for you guys. I have several more I need to write up and post.

    Glad I can help you guys out!!
     
  12. PrimedTsi

    PrimedTsi Proven Member

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    Joined Jan 11, 2003
    Southern, Maryland
    LOL i love tuners! THATS A HEAD STUD HOLE!!!!

    That small notch is there to give the machinist and or a SMART DSM owner a idea of how much the head HAS or CAN be decked. Im not sure what the machinist technical term is for it but its a inspection spot....not a oil pressure/relief port. It even shows you that in the FACTORY SERVICE MANUAL!

    Your a "machinist" and couldnt see that a head stud goes through that hole? Next your going to tell me you hollow drill the head stud to allow for better oil flow:tease:

    Did you even look on the block and see that their is NO matching spot for your "special out oil port"???
     
    My DSM:
    1995 Eagle Talon TSi AWD

    10.519 @ 140.280 MPH
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  13. pneumo

    pneumo Proven Member

    3,018
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    Joined Oct 19, 2002
    Bay Area, California
    It's obvious that you misunderstood the mod that bogusSVO has done.
    It's a legit mod, it's a viable solution. He's opened up the spot where the head gets it's fresh, pressurized oil supply from the block.
     
    My DSM:
    1992 Eagle Talon TSi AWD

    11.514 @ 118.130 MPH
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  14. Mr PopUps

    Mr PopUps Proven Member

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    Joined Jul 10, 2009
    Ft. Mitchell, Kentucky
    Wow what a lack of complete brain power. Even when youre told the truth you still cant accept it. That hole is a head bolt/stud hole, and there is a 'pin' in the block that locates the head to the block. No oil can EVER pass through that hole. The head does NOT get its supply from the block in any of those locations.

    No 'real' insult meant, but hes a Phord owner....and you havent learned anything about my head, or you would know that i am right.
     
  15. pneumo

    pneumo Proven Member

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    Joined Oct 19, 2002
    Bay Area, California
    OK so the way the internet works, I'm supposed to keep posting the right answer until no one disagrees, right?
    How long will the doubters keep posting the wrong 'truth'?
     
    My DSM:
    1992 Eagle Talon TSi AWD

    11.514 @ 118.130 MPH
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  16. 300dollarGSX

    300dollarGSX Proven Member

    93
    3
    Joined Feb 28, 2003
    Milton, Florida
    You're correct, it is a head stud/bolt hole. That wasn't disputed (it's pretty obvious). If you have a spare head laying around, go grab a light and point it down into that hole. You can see another hole about 1/2" down (if you're looking from the bottom of the head).

    The parts used to gauge how much material has been removed from the head are also visible in this picture. In fact, the part of the head that BogusSVO has ported in the picture is "pointing" to it. It's the little circle with the freeze plug looking piece in it.

    Here is the block and I have outlined the part that would be affected. Sorry the picture is blurry.
     

    Attached Files:

  17. Mr PopUps

    Mr PopUps Proven Member

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    Ft. Mitchell, Kentucky
    Doubter... hmm. How long have you had YOUR car? How many motors have YOU built?

    Just because my post count is low, doesnt mean anything except im new to this board.

    :::going to dig up the DSMCD manual to prove im right:::

    Best i could do, i circled the pin im talking about, it fits in the recess completely blocking anything, as if the bolt/stud didnt already:

    block%20pin.jpg
     
  18. Mr PopUps

    Mr PopUps Proven Member

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    Ft. Mitchell, Kentucky
    Wrong side dude, the pins are in the top left and bottom right, the head is 'opposite' when upside down. Where you are pointing is still not the right spot.

    It may be the right spot, since the pic shows the intake side, but still no oil can flow from there.
     
  19. 300dollarGSX

    300dollarGSX Proven Member

    93
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    Joined Feb 28, 2003
    Milton, Florida
    No, it's the correct spot. Note the position of the engine stand. The transmission would bolt on that side (the right in the pic), so you're looking at my block backwards.

    Here's a pic inside that hole. I hope the resize worked correctly. LOL
     

    Attached Files:

  20. pneumo

    pneumo Proven Member

    3,018
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    Joined Oct 19, 2002
    Bay Area, California
    The mod is done to the exhaust side. There's no alignment dowel there.
    BTW I've had my DSM since 1994. I took the time to understand how the oil flowed through the entire engine during my first rebuild many years ago.
     
    My DSM:
    1992 Eagle Talon TSi AWD

    11.514 @ 118.130 MPH
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  21. Mr PopUps

    Mr PopUps Proven Member

    393
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    Joined Jul 10, 2009
    Ft. Mitchell, Kentucky
    Oh ok, for poops and giggles, lets say that youre correct. We will also ASSUME that you know your motor NEEDS oil pressure. Right? Well, IF oil came out of that hole (it looks like someone bored through into the oil galley, big no no), then it would go STRAIGHT to the 'open air' of the head, and NOT through the galleys, lifters etc....

    Ever pre oil your motor with a drill spinning the oil pump and forget to put the valve cover back on? Ever wonder how the lifters could shoot oil 5ft in the air? Thats only a LITTLE bit of pressure, but if that was wasted getting sprayed into the area of the head that allows the oil to drain back in to the block, what would be the point?
     
  22. pneumo

    pneumo Proven Member

    3,018
    55
    Joined Oct 19, 2002
    Bay Area, California
    There's a bolt head and washer to cap off the top of the head bolt hole, so oil won't shoot out.
     
    My DSM:
    1992 Eagle Talon TSi AWD

    11.514 @ 118.130 MPH
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  23. PrimedTsi

    PrimedTsi Proven Member

    44
    0
    Joined Jan 11, 2003
    Southern, Maryland
    I going to have to bow out and give my apologies here. I just went and checked several heads and blocks and the THE oil pressure port in the block. In all the 1g heads thats a rough port like he shows above but on 2gs is a very precisely drilled hole. Directly to the right of that hole is a allen head plug for oil port access. Im still stumped as to how the oil pressure flows around the head stud and into that port with precision. Anyone with l19 or a1 head studs knows how tight those studs are in the head. But that is infact the ONLY oil pressure port going into the head and porting it out will infact help.
     
    My DSM:
    1995 Eagle Talon TSi AWD

    10.519 @ 140.280 MPH
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  24. ForceFedRed

    ForceFedRed Proven Member

    71
    7
    Joined Jan 29, 2003
    Dillsburg, Pennsylvania
    Oil travels around the bottom of the flywheel end stud on the exhaust side of the head, exactly where that picture shows. The bottom is sealed by the deck surface and the head gasket, the top by the bolt head, or washer if using studs.

    Here is a diagram from the 90-91 FSM that shows that oil clearly shares that hole with the stud. This is the 1.8 diagram, the 2.0 isn't as detailed but I assure you, it works the same.

    1.8L
    18Loil.jpg
    2.0L
    20Loil.jpg

    If you still feel the need to resist that this is, in fact, how oil is plumbed to the cylinder head, please, go take (or find) a picture of the sealing surface of the cylinder head, and point out where you think the galley is.

    I'm going to take a wild guess and say the picture of the galley in the stud hole may look jagged because it appears that that head started life as a 7 bolt head and was machined for the larger 6 bolt head studs.

    *Edit* This isn't directed at you Ken.
     
  25. PrimedTsi

    PrimedTsi Proven Member

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    Joined Jan 11, 2003
    Southern, Maryland
    Here is a clear view of the top of the block. That is infact the ONLY oil pressure port coming up the head. I AM WRONG AND ILL ADMIT IT:coy:
     

    Attached Files:

    Last edited by a moderator: May 26, 2010
    My DSM:
    1995 Eagle Talon TSi AWD

    10.519 @ 140.280 MPH
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