Posted by John G. Hasler on February 23, 2009 at 11:41:58 from (207.118.245.178):
In Reply to: Re: Governor tuning posted by teddy52food on February 23, 2009 at 07:02:50:
> The spring opens the throttle, the weights close it.
The spring exerts force that tends to open the throttle, while the centrifugal force on the weights (transferred through the thrust bearing and the rocker arm) exerts force that tends to close it. When the two forces are equal the throttle doesn't move.
Shaving the weights will reduce the amount of additional force they exert on the spring for a given increase in speed. This will result in a smaller change in throttle position for a given change in speed: a reduction in gain.
> Put in a new spring is about all that is > needed.
Yes, a weaker spring will increase the gain.
Of course, we don't actually know what the OP means by "response". If he just wants the engine to speed up faster when he pushes the speed control to maximum he should add an accelerator pump[1]. If that does not suffice he should disconnect the governor and connect the speed control linkage directly to the throttle.
If he wants faster response to a step change in load, there isn't a lot to be done. Increasing the gain will give slightly better step response at the price of increased overshoot but to go beyond that would require fancy electronics.
[1] The accelerator pump should be operated only by the speed control, of course. Putting it inside the loop might produce interesting results, but only on someone else's machine.
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