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Technical Flat 4

Discussion in 'The Hokey Ass Message Board' started by hoppedup46, Apr 20, 2017.

  1. hoppedup46
    Joined: Oct 3, 2010
    Posts: 18

    hoppedup46
    Member
    from Norfolk UK

    Can anyone tell me what the volumetric efficiency is of a stockish Model B flat 4 should be? Compression ratio 6.8:1

    Sent from my 9001X using The H.A.M.B. mobile app
     
  2. Model "B"s don't have flat fours. Volkswagens do
     
    X38 likes this.
  3. Torana68
    Joined: Jan 28, 2008
    Posts: 1,415

    Torana68
    ALLIANCE MEMBER
    from Australia

    Im going to guess he means flat head inline four :
    [​IMG]

    Where:

    VE = Volumetric Efficiency (%)
    AVF = Actual volumetric flow rate (ft3/minute)
    TAF = Theoretical air flow rate (ft3/minute)
     
  4. Flat Four is a VW club in Japan.
     

  5. squirrel
    Joined: Sep 23, 2004
    Posts: 55,934

    squirrel
    Member

    It's probably pretty good at low rpm, and falls off as rpm increases.

    But you didn't specify what RPM you're interested in....????
     
  6. hoppedup46
    Joined: Oct 3, 2010
    Posts: 18

    hoppedup46
    Member
    from Norfolk UK

    Flathead 4 cylinder.
    Why would anyone be talking about VW's on this forum?

    Sent from my 9001X using The H.A.M.B. mobile app
     
    Tim likes this.
  7. hoppedup46
    Joined: Oct 3, 2010
    Posts: 18

    hoppedup46
    Member
    from Norfolk UK

    5500 RPM

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  8. gimpyshotrods
    Joined: May 20, 2009
    Posts: 23,263

    gimpyshotrods
    ALLIANCE MEMBER

    Hnstray and squirrel like this.
  9. hoppedup46
    Joined: Oct 3, 2010
    Posts: 18

    hoppedup46
    Member
    from Norfolk UK

  10. Good natured jab at you. Your post is titled "Flat Four". Model "B"s have a flathead, inline 4 cylinder engine, as you obviously know. VWs, Corvairs, Subarus, etc. have flat fours and sixes. You probably refer to them as "boxers" in your part of the world. Silly semantics
     
  11. hoppedup46
    Joined: Oct 3, 2010
    Posts: 18

    hoppedup46
    Member
    from Norfolk UK

    Yes we almost speak the same and language.
    Just needed some information as I'm making new inlet manifold for my sons Model A. Because of his age he can't get insurance with a V8 engine so sticking with a flathead 4 cylinder and trying our best to get the most from it terms of horse power.
     

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  12. seb fontana
    Joined: Sep 1, 2005
    Posts: 8,442

    seb fontana
    Member
    from ct

    Nice header..Dual Carbs?
     
  13. Torana68
    Joined: Jan 28, 2008
    Posts: 1,415

    Torana68
    ALLIANCE MEMBER
    from Australia

    its a simple manifold if your making it you wont go far wrong , just make nice curves at the ends of the log.......
     
  14. hoppedup46
    Joined: Oct 3, 2010
    Posts: 18

    hoppedup46
    Member
    from Norfolk UK

    Single at the moment, but I dual coming later.
    Need it done and for next weekend.
    Vintage nationals at Santapod, UK
     
  15. manyolcars
    Joined: Mar 30, 2001
    Posts: 9,176

    manyolcars

    yours is similar to mine su carbs.jpg
     
  16. Rusty O'Toole
    Joined: Sep 17, 2006
    Posts: 9,657

    Rusty O'Toole
    Member

    Calling it a flat motor stamps you as a noob. It's a flathead. Or more properly a sidevalve in England.
     
  17. hoppedup46
    Joined: Oct 3, 2010
    Posts: 18

    hoppedup46
    Member
    from Norfolk UK

    Not really a noob, I just haven't posted before.
    Pics are of my old 46 on Pendine beach, the 59a flattish I built with Isky cam best flowing heads Ford produced (took ten years to find) and 3 94s (not progressive) good for 100mph. And as it was stock when I first got it.
    Also my old 1930 A. Had 390ci Cad motor when I built it with 2 97s,good for high 13s.
    And my kids at the drags last year.
     

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  18. hoppedup46
    Joined: Oct 3, 2010
    Posts: 18

    hoppedup46
    Member
    from Norfolk UK

    I must apologise before I upset anyone else.
    The flattish should be flattie.!
    Productive text is a killer, I will have to proof read before I hit send

    Sent from my 9001X using The H.A.M.B. mobile app
     
  19. hoppedup46
    Joined: Oct 3, 2010
    Posts: 18

    hoppedup46
    Member
    from Norfolk UK

  20. Juggler
    Joined: Aug 20, 2010
    Posts: 78

    Juggler
    Member

    Good looking set up Darren

    Looking forward to seeing it run at the weekend

    Check the banger dyno run results on that other forum for info on vol efficiency

    Cheers

    Juggs
     
  21. hoppedup46
    Joined: Oct 3, 2010
    Posts: 18

    hoppedup46
    Member
    from Norfolk UK

    Thanks Andrew, can't take credit for it all Sidney did help.
    Let's hope it works.
    I'll check out that banger report.

    Sent from my 9001X using The H.A.M.B. mobile app
     
  22. There's a lot or irony there where it says "productive text". Yes. Predictive text is a bitch :)
     
  23. hoppedup46
    Joined: Oct 3, 2010
    Posts: 18

    hoppedup46
    Member
    from Norfolk UK

    Oops

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  24. 97
    Joined: May 18, 2005
    Posts: 1,982

    97
    Member

  25. hoppedup46
    Joined: Oct 3, 2010
    Posts: 18

    hoppedup46
    Member
    from Norfolk UK

    Thanks for that. I will definitely check it out.
    Already have the book, a most inspiring read.

    Sent from my 9001X using The H.A.M.B. mobile app
     

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