| 摘要 |
<p>A dual diaphragm servo has one diaphragm operatively connected to the engine distributor advance plate and operatively interconnected with the other, the two diaphragms being operatively controlled in their movements by vacuum from induction passage ports at opposite sides of the carburetor throttle valve, the vacuum to the diaphragms being selectively controlled as functions of changes in vehicle speed and for engine or ambient operating temperatures, to modulate the timing advance in a variable manner with changes in vacuum level.</p> |
