3.2 head porting photos | FerrariChat

3.2 head porting photos

Discussion in '308/328' started by snj5, Jan 13, 2008.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, Skimlinks, and others.

  1. snj5

    snj5 F1 World Champ

    Joined:
    Feb 22, 2003
    Messages:
    10,213
    Location:
    San Antonio
    Full Name:
    Russ Turner
    Last edited by a moderator: Sep 7, 2017
    snj5, Jan 13, 2008
    #1
  2. racespecferrari

    racespecferrari F1 Veteran

    Joined:
    Jan 31, 2006
    Messages:
    7,583
    Location:
    Suffolk, Uk
    Full Name:
    Pete.G By The Sea
    Fantastic pics & great work Russ.

    Could I ask how much this costs to have done?
     
    racespecferrari, Jan 13, 2008
    #2
  3. miketuason

    miketuason F1 World Champ Owner Silver Subscribed

    Joined:
    Feb 24, 2006
    Messages:
    15,783
    Location:
    Cerritos, CA.
    Full Name:
    Mike
    And who did it?
    Also don't forget to port the other head:D
     
    miketuason, Jan 13, 2008
    #3
  4. snj5

    snj5 F1 World Champ

    Joined:
    Feb 22, 2003
    Messages:
    10,213
    Location:
    San Antonio
    Full Name:
    Russ Turner
    :)
    Depends how far you want to go obviously and widely variable, but with the new valves and some extras about $5K, or 100 quid at the current exchange rate

    :)
    Image Unavailable, Please Login
     
    Last edited by a moderator: Sep 7, 2017
    snj5, Jan 13, 2008
    #4
  5. Pizzaman Chris

    Pizzaman Chris F1 Rookie

    Joined:
    Mar 13, 2005
    Messages:
    3,919
    Location:
    New Hampshire
    Full Name:
    Pizzaman Chris
    Fantastic!

    Ok Russ, put the plane on the side and lets get that Mondial back together.;) Spring is coming!
     
    Pizzaman Chris, Jan 13, 2008
    #5
  6. snj5

    snj5 F1 World Champ

    Joined:
    Feb 22, 2003
    Messages:
    10,213
    Location:
    San Antonio
    Full Name:
    Russ Turner
    As most know, the stock exhaust valve proprtionately is too big to be optimal when compared to the stock intake. We chose to bring the intake flows up to meet a more ideal ratio. In addition to using a larger intake valve, the entire runner was ported, matched and tapered from the top of the intake manifold where it bolts to the larger 44 mm Weber DCNF carb (308 stock is 40mm). This allows more flow while increasing velocity of the charge, which improves drivability.
    The flow bench shows a 10%+ increase in max flow rates, the amount of time it is flowing at higher velocity is increased ("area under the curve" for flow rate x time) for (hopefully) more than a 10% volumetric flow. We decided NOT to go for max flow possible, as with my chosen carb set up the resulting low velocities the car would not be as low end friendly. The compromise was max flow at max velocity. In case some are wondering, we are shooting for a 36 or 38mm venturi (stock 308 is 32).
    The pictures show the qv carb manifold, the view from the carb mounting pad, and the manifold pad on the head. You can see the steady taper to promote charge velocity.
    Image Unavailable, Please Login
    Image Unavailable, Please Login
    Image Unavailable, Please Login
     
    Last edited by a moderator: Sep 7, 2017
    snj5, Jan 13, 2008
    #6
  7. regisgtb4

    regisgtb4 Formula Junior BANNED

    Joined:
    Mar 20, 2007
    Messages:
    463
    Location:
    tx
    Full Name:
    willis
    Wow, what a hog out! Did you have to do some welding to end up with such a large round bell shaped opening on the entrance of those heads?What is the diameter of the entrance of the port at the flange? What is the width 5mm in, 10mm in 15mms in, what is the width at the splitter and finally at the seat? Thanks a lot for sharing these pics.
     
    regisgtb4, Jan 13, 2008
    #7
  8. regisgtb4

    regisgtb4 Formula Junior BANNED

    Joined:
    Mar 20, 2007
    Messages:
    463
    Location:
    tx
    Full Name:
    willis
    And then it looks like a typical 330 or 365 port with 2 valves instead of one. How sad that our 308s were not ported and polished like every model before its production.If Nixon had not ruined the auto industry in the name of envoirmentalism we might have gotten Lucas timed injection and that means throttle response like F1.All The Cars are hand ported,but 308s got little in that way,breaking a long tradition for The Factory.The USA mandated CIS induction was from conception an air pollution device and even the euro Cars didnt escape the grasp of Congress.Thanks for the photos,those ports look vintage Modena to me.
     
    regisgtb4, Jan 15, 2008
    #8
  9. snj5

    snj5 F1 World Champ

    Joined:
    Feb 22, 2003
    Messages:
    10,213
    Location:
    San Antonio
    Full Name:
    Russ Turner
    More photos!!
    Here are some better photos of the intake ports and seats for the larger valves. Even though the intake valves are larger than a 348, the velocities are still higher than the stock 3.2. We will also be installing new guides and feathering them in. I've also enclosed a photo of the port matched intake manifold for the new 44 DCNFs, as well as a comparison shot between a 40 and 44 DCNF carb butterfly. (There is thread on the 40 to 44 DCNF swap).

    We had always heard a rule of thumb was to take out the "figure of 8" intake port shape and make it more like a 348, and that bears out in practice on the flow bench.
    Image Unavailable, Please Login
    Image Unavailable, Please Login
    Image Unavailable, Please Login
    Image Unavailable, Please Login
    Image Unavailable, Please Login
     
    Last edited by a moderator: Sep 7, 2017
    snj5, Jan 30, 2008
    #9
  10. Pizzaman Chris

    Pizzaman Chris F1 Rookie

    Joined:
    Mar 13, 2005
    Messages:
    3,919
    Location:
    New Hampshire
    Full Name:
    Pizzaman Chris
    I can't keep up with all this info and pictures!

    Thanks Russ. I'm getting a lot of answers today.
     
    Pizzaman Chris, Jan 30, 2008
    #10
  11. snj5

    snj5 F1 World Champ

    Joined:
    Feb 22, 2003
    Messages:
    10,213
    Location:
    San Antonio
    Full Name:
    Russ Turner
    Last edited by a moderator: Sep 7, 2017
    snj5, Jan 30, 2008
    #11
  12. Pizzaman Chris

    Pizzaman Chris F1 Rookie

    Joined:
    Mar 13, 2005
    Messages:
    3,919
    Location:
    New Hampshire
    Full Name:
    Pizzaman Chris
    Last edited by a moderator: Sep 7, 2017
    Pizzaman Chris, Jan 30, 2008
    #12
  13. snj5

    snj5 F1 World Champ

    Joined:
    Feb 22, 2003
    Messages:
    10,213
    Location:
    San Antonio
    Full Name:
    Russ Turner
    not sure - they are new cams.
     
    snj5, Jan 30, 2008
    #13
  14. ktmrider

    ktmrider Rookie

    Joined:
    Oct 30, 2005
    Messages:
    24
    How many miles Kilometers did the old heads have on them ? What year car is this for ?
     
    ktmrider, Feb 1, 2008
    #14
  15. snj5

    snj5 F1 World Champ

    Joined:
    Feb 22, 2003
    Messages:
    10,213
    Location:
    San Antonio
    Full Name:
    Russ Turner
    This is a 1988 w/ 50K miles.
     
    snj5, Feb 1, 2008
    #15
  16. JCR

    JCR F1 World Champ Silver Subscribed

    Joined:
    Mar 14, 2005
    Messages:
    10,800
    Location:
    H-Town, Tejas
    Most likely "parkerizing" aka phosphate coating.
     
    JCR, Feb 1, 2008
    #16
  17. Harry

    Harry Karting

    Joined:
    Nov 1, 2003
    Messages:
    101
    Location:
    Germany
    I would think the black coat on the cams is carbon residue from nitrogen hardening. I would polish the surfaces for the oil seals and clean the threads as well as the oil holes and then blow everything out with air.

    Regards
    Harry
     
    Harry, Feb 2, 2008
    #17

Share This Page