The Craftmans Shop > Model Engineering

Side Valve i.c. engine from Bar stock

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Brian Rupnow:
Today I'm just tidying up loose ends, so decided to machine the starter collar. This bolts onto the brass flywheel and lets me use my variable speed drill as a starter.

Brian Rupnow:
So now the engine has a starter ring. If I ever get finished to the point where I want to start it, the ring will be waiting for me.---On to more interesting things like pistons tomorrow. (I hope!!)

Brian Rupnow:
Somebody messed up, and my gasket material never got ordered. Now it's ordered and won't be here until Monday or Tuesday. This doesn't cause a huge problem, because I'm up to my armpits in "real" work right now and have no time to play machinist. This drawing is an  interesting part. I have made it before. It mounts a set of my favorite Chrysler product ignition points, and clamps onto the extended head of a crankshaft support bushing. By loosening off the clamp bolt, I can manually adjust the ignition timing while the engine is running. This is no big thing once the engine is all set up and running at its optimum timing, but it sure is a nice thing to have when first starting the engine and "setting up". I used this when I built the Odds and Ends hit and miss engine designed by Philip Duclos, and it really is a handy thing to have on the engine.

Brian Rupnow:
Now I have enough work to keep me going until the gasket material arrives. There is a big chain of consequence attached to the lack of gasket material. I can not permanently attach what I have been calling the "combustion chamber" to the cast iron cylinder until I have a ring of gasket material to insert between them to prevent loss of compression. I can't hone nor lap the cylinder/combustion chamber until they are permanently attached to each other. I can't make the piston until I am finished the lapping and honing. I'm sure there will be enough work in this con rod and the points mounting bracket to keep me going until the gasket arrives next week.

Brian Rupnow:
Here we have the con-rod layout. I don't work to the layout lines, but they let me know if I have turned the dials on my mill one too many times when I am actually machining it. I don't trust my mill vice to hold this perfectly flat while working on it. I will put a sacrificial plate underneath it and use hold down bolts in the tee slots to hold it flat on my mill table while drilling and boring all the holes. Two critical holes for the bearings at each end which will have to be bored, and 4 drilled holes to form the radii where the straight sides blend into the round ends.

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