One highly interesting concept for controlling cam timing is that of using electric solenoid actuators to directly control the valves. This gives valve control which is completely independent of cylinder position, thus allowing a number of dramatic approaches, including dynamic braking and cylinder shutdown for best fuel economy. If you're like a lot of Americans. You think of diesel engines, you think of noisy, smelly, smoke-belching truck engines. And, if you are over the age of 35, you might also think of the horrible experience of GM car owners who bought cars equipped with unreliable diesel engines during the fuel crises of the 1970's.
Times do change, however.
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