Quote:
Originally Posted by lust4speed
I haven't really questioned the use of the ball before, but looking at the diagrams it appears that the ball/seat has to provide a controlled leak and not a positive seal. Looks like only way for vacuum to pull up the diaphragm is leakage past the check ball? Guess without the ball the movement of the diaphragm would be both too quick and erratic?
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Correct. The ball is not blow-out protection.
It is two things: a controlled leak and a calibrated "mass of the ball' vs the signal (lift) capability of the circuit.
They both work together to have a smooth secondary opening IF you use the right spring rate in the housing vs the engine load.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
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