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Features 345 Hemi Desoto

Discussion in 'The Hokey Ass Message Board' started by Gullwing, Sep 6, 2013.

  1. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,341

    falcongeorge
    Member
    from BC

    I tried flow bench testing it years ago, but after I thought about it, I decided it was inconclusive, as on the flow bench, theres no way to simulate all the pulsing and backwash that happens in a running motor. One thought I had on the subject is that end gases could be pumped into the open end of the passage on the exhaust cycle, and be drawn back into the cylinder on overlap as the intake valve starts to open. Dyno testing would be the ultimate test.
     
    Last edited: Sep 17, 2013
  2. TR Waters
    Joined: Nov 18, 2006
    Posts: 1,439

    TR Waters
    Member
    from Vermont
    1. Early Hemi Tech

    Chrysler hemi with Webers.
     

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  3. RichFox
    Joined: Dec 3, 2006
    Posts: 10,020

    RichFox
    Member Emeritus

    Of course the exhaust heat riser on the Ford only connects to one exhaust valve per head. On the Chrysler and Pontiac and other heads, the riser connects the two center cylinders on each head. Which may promote mixture dilution. Or as many fuel racers believe, popping back through the blower. Cement might be fine. It would scare me. And we don't really have furnaces here. Or cement for furnaces.
     
  4. Gullwing
    Joined: May 16, 2007
    Posts: 29

    Gullwing
    Member

    TR I like the picture of Webers on a Chrysler hemi. However there are a lot of intake manifold choices for the Chrysler. The Desoto gets no love because of the lack of intake choices. In my case if you add the issue of hood clearance then its really bad.
     
  5. CNC-Dude
    Joined: Nov 23, 2007
    Posts: 1,031

    CNC-Dude
    Member

    You could also slant the carbs toward the center of the engine some to give you more clearance for the hood. I've thought of that design myself, it sorta' copies the look of some mechanical injectors I saw on a 440 Mopar once. Since the ram tubes are staggered from the ones on the carb on the opposite bank, you can lean them over quite a bit and gain a lot of clearance. Then you eliminate the dogleg in the intake port and have a straight shot into the head.
     
  6. jbtine
    Joined: Nov 22, 2005
    Posts: 214

    jbtine
    Member

    I built my own 3 duece intake for my 341 and used that remote thermostst housing. The biggest problem with that setup was from a cold engine start. As the engine warmed up heat only trickled up through the rubber return hoses. Engine heat would build to well over 210, as much as 240 before the thermostat would get enough heat to open. Cool weather was worse than hot weather. The solution was to drill the remote housing for a 1/8" pipe thread and use a small hose barb and hose to the water pump. Shown in the 2nd picture. From a cold start the engine warmed to 180 degrees and never had the temp spike. A small bypass hose. <!-- attachments --><!-- attachments -->
     

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  7. sunbeam
    Joined: Oct 22, 2010
    Posts: 6,214

    sunbeam
    Member

    Good stuff jbtine
     
  8. TR Waters
    Joined: Nov 18, 2006
    Posts: 1,439

    TR Waters
    Member
    from Vermont
    1. Early Hemi Tech

    Would it have been easier to start with a Chrysler Weber intake, and modify it for your Desoto? Basically cut the flange off and add a Desoto flange?
     
  9. Gullwing
    Joined: May 16, 2007
    Posts: 29

    Gullwing
    Member

    I don't know the answer to that. I considered it I didn't have one to play with. I was a little leery to buy one then cut it up.
     
  10. TR Waters
    Joined: Nov 18, 2006
    Posts: 1,439

    TR Waters
    Member
    from Vermont
    1. Early Hemi Tech

    I can understand that.
     
  11. EARLYHEMIBILL
    Joined: Apr 7, 2008
    Posts: 465

    EARLYHEMIBILL
    Member
    from ?

    That's a nice lookin outfit.
     
  12. jbtine
    Joined: Nov 22, 2005
    Posts: 214

    jbtine
    Member

    I got the idea from an article posted on the HAMB about 6 years ago. I don't know if it is still on here so here it is if it is any value to you.
     

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  13. Gullwing
    Joined: May 16, 2007
    Posts: 29

    Gullwing
    Member

    [​IMG][/URL][/IMG]

    I just got my manifold back from the machinist. Welded the two pieces to the base. I can then cast them as one piece and save me some cost.
     
  14. Gullwing
    Joined: May 16, 2007
    Posts: 29

    Gullwing
    Member

  15. Gullwing
    Joined: May 16, 2007
    Posts: 29

    Gullwing
    Member

    [​IMG]

    It's taken a while but I finally got my intakes cast up. This is a unmachined casting. I will probably be a few weeks but I will post a pick after I machine them and polish them.
     
  16. EARLYHEMIBILL
    Joined: Apr 7, 2008
    Posts: 465

    EARLYHEMIBILL
    Member
    from ?

    Being that the carbs are side draft, remove everything but the butterflies, and go with a Megasquirt type injection by installing injectors in the manifolds. It will keep the Weber experts guessing if they can't see the injectors. Just a thought.
     
  17. blown36
    Joined: Oct 5, 2008
    Posts: 21

    blown36
    Member
    from Oz

    Wondering how this ended after the prototype?
     

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