Making a Model A overhead valve head.

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  • George Miller
    RIP
    The VFF will miss you
    "Permanent Member"
    • May 2017
    • 1174
    • NC

    Making a Model A overhead valve head.

    005.JPG This will be the making of a cylinder head at my home. using two pieces 7075 alum. I will try to put them in the order it was made. The first picture will be two pieces that I started with. I had all the plans in my head.





    cylinder head material before work.JPG
    Last edited by George Miller; 06-13-2018, 09:37 AM. Reason: found the picture of the head layout
  • George Miller
    RIP
    The VFF will miss you
    "Permanent Member"
    • May 2017
    • 1174
    • NC

    #2
    cylinder head.JPGCylinder head 4 001.JPG

    Comment

    • pooch
      OZ Model A Junkie
      • May 2018
      • 1316
      • South Coast NSW Australia

      #3
      This will prove to be vey interesting George.

      I have seen people start with a casting, but never two slabs of alloy.

      I hope that isn't your blood already on the side.

      When me and my buddy work on our cars together, if everything goes OK, we say..no blood no swearing today!.

      Comment


      • George Miller
        George Miller commented
        Editing a comment
        no I got to keep all my blood that time. But I have lost a little over the years.
    • George Miller
      RIP
      The VFF will miss you
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      • May 2017
      • 1174
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      #4
      I could not find the lay out or drilling, or machining the pockets. More to follow when time permits. Machine work took about 80 hours if memory is correct. This head was made in 2010.

      Comment


      • pooch
        pooch commented
        Editing a comment
        Ahh, so this head is already made years ago, yes keep the pics in order and only tell us what is done progressively.

        This will keep the suspense for then knowing how it performs and looks, and sounds, I wonder if an OHV head will change the exhaust note of the A..

      • George Miller
        George Miller commented
        Editing a comment
        Yes It will on this head. It is about 7 to 1. But I think it does any way. For one thing it can use a little more timing.
    • George Miller
      RIP
      The VFF will miss you
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      • May 2017
      • 1174
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      #5
      Cylinder head 5 001.JPGCylinder head 5 003.JPGCylinder head 5 004.JPG

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      • George Miller
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        • May 2017
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        #6
        Finnish machine ports and water jacket

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        • George Miller
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          • May 2017
          • 1174
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          #7
          cylinder head 8 001.JPGcylinder head 8 002.JPGcylinder head 7-1.JPG

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          • George Miller
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            • May 2017
            • 1174
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            #8
            Machining inside the top of the head and putting on the radius.

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            • George Miller
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              • May 2017
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              #9
              cylinder head 6 002.JPGcylinder head 6 001.JPGcylinder head 001.JPGCylinder head 4 002.JPG

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              • George Miller
                RIP
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                • May 2017
                • 1174
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                #10
                machine combustion chambers, intake ports,water pump mount, milling head to length.

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                • George Miller
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                  • May 2017
                  • 1174
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                  #11
                  cylinder head 9 002.JPGcylinder head 10 001.JPGcylinder head21 008.JPGCylinder head 20 003.JPG

                  Comment


                  • RockHillWill
                    RockHillWill commented
                    Editing a comment
                    Extremely nice work George. I appreciate your taking the time to share your work.
                • George Miller
                  RIP
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                  • May 2017
                  • 1174
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                  #12
                  completed head. It was a lot of fun making it. This car and this head won a few hill climbs. Then I quit going for a while. Then I changed the intake and exhaust to fit in my blue roadster. Then the last two years went back to the hill climb. At this point it is running very strong. Now some day put the head on my 5 main with the chev crank.

                  Comment

                  • Corley
                    Senior Member
                    • Jan 2018
                    • 843
                    • Battle Ground, WA

                    #13
                    Some really cool machine / milling work there George. Did you consider adapting some other head? Seems like some V8 head might have had about the same spacings. I suppose just the head bolts would kill that idea, let alone the water jacket ports. What about an overhead cam setup, was that considered? Not criticizing in any way, just wondering your thought process that steered you this way.

                    Looks like you are way more of a machinist than I am! Gotta respect that talent. For the hill climbs, were you sticking with an A base for some class reason or just to see what you could get out of an A? Certainly much stronger bottom ends are available. I see you also moved the starter to the other side, I imagine that was for steering clearance...

                    Very cool!
                    CB the Wonderful

                    Comment


                    • George Miller
                      George Miller commented
                      Editing a comment
                      I did use a 455 olds head one time. had to move the mounting bolts and weld a 1 inch block in the middle. It did run very well, But I just wanted to make my own head. I also used a 1928 chev head one time.
                      The hill climbs had to be a model A or B engine.

                    • George Miller
                      George Miller commented
                      Editing a comment
                      what you have to do to move the mounting holes. find the location then install a sleeve, for head bolt holes.
                      Last edited by George Miller; 06-10-2018, 02:56 PM.
                  • George Miller
                    RIP
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                    • May 2017
                    • 1174
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                    #14
                    Drilling all the holes in head. Both pieces together.
                    Last edited by George Miller; 06-09-2018, 07:48 AM.

                    Comment


                    • pooch
                      pooch commented
                      Editing a comment
                      Jeez , George, you put sure put me to shame.

                      I have only worked a milling machine for a 1/2 day in my life.

                      Was going to say, I have been told by a few hotrodders that a 28 chev 2 port head does fit if you work at it.

                    • George Miller
                      George Miller commented
                      Editing a comment
                      In the end a 28 chev does not help that much, but it does look nice on the A
                      I was lucky I got to do a lot of special jobs when I first started in a manufacturing plant as a young man.
                  • George Miller
                    RIP
                    The VFF will miss you
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                    • May 2017
                    • 1174
                    • NC

                    #15
                    28 Chev head on Model A engine 001.jpg455 Olds head on a Model A engine 001.jpg455 Olds head cut into 001.jpg

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                    • George Miller
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                      • May 2017
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                      #16
                      the 1928 chev on the left. the other two olds 455 head

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                      • DaWizard
                        RIP Wiz
                        The VFF will miss you
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                        • May 2017
                        • 9070
                        • Dizzyland

                        #17
                        As a Journeyman machinist I can appreciate the amount of work that you have put into this head. As a scratch builder of model steam engines I can appreciate the thought that went into this head.

                        The only real questions I need answered are, did you lap the two chunks of aluminum together and what head gasket did you use and what was your torque?

                        What a great job you did George.
                        You wana look waaay far up da road and plan yer route because the brakes are far more of a suggestion than a command!

                        Comment


                        • George Miller
                          George Miller commented
                          Editing a comment
                          Yes I did lap them but I also machined a O ring groove around the out side of the pice.{ I can not find that picture.}
                          Then I used a Big O ring to seal between the two pieces. and used two pins to locate to two pieces.
                          Used a Miller head gasket. The ones that fit the old Miller heads.
                      • DaWizard
                        RIP Wiz
                        The VFF will miss you
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                        • May 2017
                        • 9070
                        • Dizzyland

                        #18
                        Hey George, I was examining the pressure oiling and wondered, is that teflon tubing you used to provide oil to the center main, and if so, how is that holding up under the heat of the engine? Or is it nylon tubing, and same question.
                        You wana look waaay far up da road and plan yer route because the brakes are far more of a suggestion than a command!

                        Comment


                        • George Miller
                          George Miller commented
                          Editing a comment
                          No it is steel brake line. I run them through the old oil tubes to all three mains. Then it has a drilled crank for the rods.
                          This engine also has pressure to the cam bearings and rockers. I, running 40 lb pressure
                          Last edited by George Miller; 06-09-2018, 09:27 AM.
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