Originally Posted by John long
....There are two main levers that control forward motion. The first is the throttle that controls the amount of steam to the cylinders. The second basically does the same thing the transmission does in an automobile and has the effect of changing gears. This provides more torque at start up and more speed with less steem when cruising.
Question. How is this accomplished?
That's the vtec lever...lol.
But seriously, the other lever controls the valve setting. A steam engine uses a complicated variable valve linkage that allows the engineer to adjust the valve duration depending on load and speed. A long duration is used for maximum torque at low speed, and a shorter duration is used once the engine is up to speed. It can even be set to zero, so the valves never open (like neutral), or if you go past 'neutral' the valve timing reverses, which makes the engine run in reverse.
It's hard to explain.....