Re dashpot

[zee <zee@domain.elided>]

> The way I understand it the dashpot is a device for emissions use. It =
>is used when your engine RPM's drop fast. If you're in neutral and peg =
>the gas fast and then get off of it the dashpot should bring the engine =
>RPM back down to idle slower than usual. The theory is that more gases =
>will be burned, than if the engine just dropped back to idle by itself. =
>It won't hurt if you don't use one on a new carb. As far as performance =
>goes anyway. When I put the Holley Double pumper on the Mustang, I =
>didn't give the old carb or dashpot a second look when I tossed them =
>out.=20


This is close, but the dashpot is speed dependent. The solenoid that
activates the dashpot gets its signal from the speed sensor which in
turn gets its signal from the speedo cable. It shouldn't be active
unless the truck is doing (I think!) about 25-30 mph. When you back off
suddenly or are coasting down a hill it alows more air in to burn the
excess fuel and reduce emissions. It comes in a few forms over the
years, from mechanical switching to electric.


Bryan