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Since my slave valve assembly has come up from time to time with the different engines I've designed, I thought a bit of history and explanation might be in order. The attached drawing is only one of several variations I have come up with, but demonstrates the principle very well.
I originally came up with this arrangement while trying to design a Hit n Miss engine that would be powered by compressed air. That required that both inlet and exhaust valve operation be controlled with a governor through a single, cam operated pushrod.
While the internal combustion hit n miss engines actuate the exhaust valve with the cam, my compressed air version uses the cam to actuate the inlet valve. And, while the IC hit n miss engine initiates a power stroke by allowing the exhaust valve to close, my engine initiates the power stroke by "allowing" the inlet valve to open. Other than that, the principle is the same. Without the governor, the engine will "fire" anytime the inlet valve is opened. This would normally be every other revolution if the cam is geared to rotate at half the crankshaft speed, but can also be made to fire on every revolution by simply mounting the cam directly on the crankshaft.
Chuck
I originally came up with this arrangement while trying to design a Hit n Miss engine that would be powered by compressed air. That required that both inlet and exhaust valve operation be controlled with a governor through a single, cam operated pushrod.
While the internal combustion hit n miss engines actuate the exhaust valve with the cam, my compressed air version uses the cam to actuate the inlet valve. And, while the IC hit n miss engine initiates a power stroke by allowing the exhaust valve to close, my engine initiates the power stroke by "allowing" the inlet valve to open. Other than that, the principle is the same. Without the governor, the engine will "fire" anytime the inlet valve is opened. This would normally be every other revolution if the cam is geared to rotate at half the crankshaft speed, but can also be made to fire on every revolution by simply mounting the cam directly on the crankshaft.
Chuck