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Technical Flathead with 4. exhaust port

Discussion in 'Traditional Hot Rods' started by ruppi1932, Sep 2, 2019.

  1. ruppi1932
    Joined: Jan 16, 2018
    Posts: 5

    ruppi1932
    Member
    from Germany

    Hi

    I am currently building up a french flaty for my 32. This should get a 4-71er blower and a few more performance parts.
    To thermally relieve the engine I wanted to install a 4th exhaust port. Unfortunately, I have not found much information and pictures about it yet.
    Are the channels completely separated (if so, how?) or is the additional manifold operated parallel to the middle port?

    Greetings from germany
    matthias



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  2. Ron Plumlee
    Joined: Feb 12, 2012
    Posts: 107

    Ron Plumlee
    Member

    Lots of folks use a baffle to split the center exhaust, but it still dumps onto one exhaust pipe etc. Speedway sells the baffles....make sure you pin it in place if u use it, they have been known to get sideways and cause blockage. Be interesting to see if there really is a way to create separate ports via other feedback.
     
  3. tubman
    Joined: May 16, 2007
    Posts: 4,402

    tubman
    ALLIANCE MEMBER

    I have seen some race engines with the exhaust heat passage to the intake manifold used as an exhaust port. They had a funny little pipe coming out of the top of the engine. I don't know how effective they are.
     
  4. khead47
    Joined: Mar 29, 2010
    Posts: 1,549

    khead47
    Member

    My thought is do not worry about it with a huffer !
     
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  5. ruppi1932
    Joined: Jan 16, 2018
    Posts: 5

    ruppi1932
    Member
    from Germany

    That's exactly what I want to do - the 4th exhaust at the top next the intake. The question is just how I should share the channel.
    And if it really brings benefits or just looks cool.


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  6. Petejoe
    Joined: Nov 27, 2002
    Posts: 10,163

    Petejoe
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    from Zoar, Ohio

  7. 28dreyer
    Joined: Jan 23, 2008
    Posts: 1,105

    28dreyer
    Member
    from Minnesota

    Minimally effective and in my opinion looks like afterbirth.
     
  8. deucendude
    Joined: Oct 31, 2008
    Posts: 502

    deucendude
    Member
    from norcal

    Use Ardun heads, Done!
     
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  9. ruppi1932
    Joined: Jan 16, 2018
    Posts: 5

    ruppi1932
    Member
    from Germany

    Ok- Thanks for the answers. I read everything and look the pictures. Still unclear how the port should be shared? Weld in metal or screw in a kind of baffle??



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  10. alchemy
    Joined: Sep 27, 2002
    Posts: 14,370

    alchemy
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    If you must add another exhaust port, don't worry about separating the two cylinders. The pressure will find a way out, the easiest route it can.
     
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  11. Bandit Billy
    Joined: Sep 16, 2014
    Posts: 5,520

    Bandit Billy
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    Have you ever noticed that a Ardun sounds more like a SBC than a flathead. That Siamese middle port has a lot to do with the unique exhaust noise a flathead makes. Taking it away is like JB Welding arms back on Venus d Milo. I run a 471 blown flatty, full exhaust and it is the nastiest sounding car I have built. I wouldn't change a thing.
     
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  12. RichFox
    Joined: Dec 3, 2006
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  13. Pete1
    Joined: Aug 23, 2004
    Posts: 1,659

    Pete1
    Member
    from Wa.

    This is a pic of the mod you want to do. This one was probably the most successful one ever done.
    It was John Bradleys engine for the 1963 Bakersfield race. The top middle pipe was a definite improvement.
    You can NOT use port dividers if you use this mod. The store bought dividers are useless anyway. John Braadley car 2018-03-08 at 2.08.25 PM.png
     
  14. alchemy
    Joined: Sep 27, 2002
    Posts: 14,370

    alchemy
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    I think an Ardun sounds like a Y-block. Clickety-clack, clickety-clack.
     
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  15. RichFox
    Joined: Dec 3, 2006
    Posts: 9,757

    RichFox
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    Ford with exhaust ports rerouted to top.
     
  16. an Ardun ain't a flathead anymore..........................uggg
     
  17. Very true ^^^^^
     
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  18. jimmy six
    Joined: Mar 21, 2006
    Posts: 4,725

    jimmy six
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  19. Rick Schnell's Slider Dragster.

    Unless you are doing an all out - full race build like this, there is not much reason for that 4th port. This motor develops close to 1000 hp on a high percentage of nitro, runs deep into the 7's, and sounds otherworldly.

    [​IMG]

     
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  20. banjorear
    Joined: Jul 30, 2004
    Posts: 3,772

    banjorear
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    I've seen this mod a few times and was going to look for the same picture.

    I'd love to know what they do about the water jacket. Does the exhaust pipe go into the valve bowl through the water jacket?

    It seems like this dragster motor is a dry block set up.
     
  21. alchemy
    Joined: Sep 27, 2002
    Posts: 14,370

    alchemy
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    There's no water there. It's the cast-in intake heat port.
     
  22. WB69
    Joined: Dec 7, 2008
    Posts: 862

    WB69
    Member

    Awesome!!
     
  23. banjorear
    Joined: Jul 30, 2004
    Posts: 3,772

    banjorear
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    No, I mean the end exhaust. There are water jackets in those corners I believe. The motor I'm talking about isn't in Slider. It's in the purple FED.
     
  24. RichFox
    Joined: Dec 3, 2006
    Posts: 9,757

    RichFox
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    That engine has the water jackets full of aluminum. So it in effect has no water jackets and they cn just bore straight through into the exhaust port
     
  25. The cylinder heads are cool, do you know what brand they are?
     
  26. RichFox
    Joined: Dec 3, 2006
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    RichFox
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  27. Bruce Lancaster
    Joined: Oct 9, 2001
    Posts: 21,683

    Bruce Lancaster
    Member Emeritus

    Somewhere on here is a post showing the exhaust passages very well...the guy sawed the deck off of a junk block just so. Circuitous, bu smoother than I thought it would be! At the outlets there are two basic schools of thought on how to move exhaust the last 3 inches.
     
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