Engine braking Gas Vs Diesel
Just wondering why gas engines have better engine braking than diesel. No real reason, just wondering. With the higher compression of the diesel I would think that diesel would be better but understan...
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Bedlam wrote:
I wonder if variable valve timing could accomplish the same control as the throttle plate.
Variable Valve Timing only controls when the valves open, and not how much it opens which is what is needed to control the air/fuel ratio. VVT basically rotates the cam to control the moment when the cam lobes push the valve down. The amount the lobe pushes the valve down is not controlled. You can in theory have a slant lobed cam that moves front to back to control how far the valve opens, but that would be adding more cost and more complexit to something as low cost and simple as a throttle valve. Or you can have some sort of motor controlling tha valves, but again it will add cost and complexity with not much of an added benefit over a throttle valve.
