| Even in 1913, the casting of complicated and intricate designs of engine parts was little used due to the lack of technology. These cylinders were therefore machined from a sixty-seven pound steel billet. The finished weight less valve is eight pounds. Most of the fins were obviously machined on a lathe, but those around the two spark plug holes and rocker mount were milled. In the top of the cylinder is a flapper style exhaust valve, the disc is mounted directly to the rocker arm. Just below the cooling fins is a spanner nut and threaded section. Once the cylinder is threaded into the block to the right height and orientation, the spanner is used to lock it solidly in place. Under the threaded section is the series of intake ports, which allow the fuel mixture to flow from the crankcase into the cylinder just above the piston dome. Notice the extended cylinder skirt below the ports. This gives the pistons sufficient room to descend beneath the ports during the intake stroke. Because the cylinders are made of mild steel, it was necessary to install a cast iron cylinder liner to insure long life against wear. These liners are about 1/16 inch (0.0625 inch or 1.6 mm) thick. You can see the broken edges of the liner on the cylinder to the right. |
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Copyright © 2000 Tazbat Publishing Most recent update 03.03.2004 |