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| Another Halo |
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| kvom:
To get a runner, I will need to supply air to all 5 cylinders individually. So I made this simple manifold for a small piece of aluminum bar. Drilled 3 through holes and threaded the 6 openings 1/4-27 NPT. Then 5 hose barbs for 1/4" plastic tube and ther 6th hole for the regulator line. The "tuning" instructions are to do each cylinder individually, where you are primarily setting the length of the pushrods so that the input and output valves open and close properly. I realized that I could do this with the tubing attached to all of the cylinders by having only the cylinder being tested have pushrods installed. On a cylinder without pushrods the input valve will be held closed by the air pressure. This manifold is a temporary fixture; I hope to incorporate a better design into the final design of a stand and base. We are going offroading tomorrow (snow possible ::)), so if I don't break anything on the Jeep I might be able to make some more progress on the engine. |
| NickG:
Very nice work Kirk, can't wait to hear this beauty 'fire' up! Nick |
| kvom:
Despite a list of things I "should" be doing, I spent most of the afternoon doing some fit and assembly of the heads to the cylinders. For any interested onlookers, here's the procedure (just repeat 5 times). First, place the valve balls into the input (left) and output valve bores. I found it tricky to get the depth correct, so before further assembly I tested each visually by pushing the plunger while looking to see that the ball moves upward. If not, the bore is not deep enough. Using a depth mic, I determined how much more was needed to reach the indicated .185". Then I chucked the head in the vise and used a #8 reamer in the mill to deepen it. Mostly I needed around .005" or so. Next, fasten the valve cover to the head, making sure that the inlet hole is on the left. Next the head must be attached to the cylinder. Note that one hole is counterbored do allow the rocker bracket to sit flat. For this reason the bracket is attached after the head. The plungers are now inserted along with their springs. I cut down the springs to 3 turns to reduce the force on the cams. We'll see if it need more or less when we try to get it to run. Finally the rocker bracket and arms are attached. With all 5 heads assembled, we have this front view: And from the rear: I need to get some more plastic tubing to attach my little manifold, and then cut the pushrods to length before the first trial with air. |
| Darren:
You have come on well with this, doesn't it look quite something .... you excited yet :) |
| chuck foster:
what a build :bugeye: i bet you can't wait to see this one run.............heck i didn't build it and i can't wait to see it run :D it has been a big project and i just want to say thanks for the pictures and the write up :ddb: :ddb: :ddb: chuck :wave: |
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