Tutor Me

[Anonymous]

There are a couple of "theory of operation" questions that have been on my mind recently. I hope I have selected the proper forum to ask for enlightenment.

1. On a Carter YF 1 BBL carb there is a voltage activated solenoid that operates the bowl vent. Why isn't the vent open all the time? Does the solenoid open or close the vent? When is it activated? What happens when the solenoid fails?

2. I need the theory of operation of a Dashpot? What does it accomplish? What happens when it fails?

I have searched the net looking for anything that would explain any or all of this to no avail. I'm sure there are those reading this that has the knowledge to further my understanding.

 

[Anonymous]

On emission controlled vehicles begining in the mid to late 70's, the bowl vent had a hose running to the charcoal canister, allong with the tank vent. When the engine is running above idle, vaccum suck all the unburned fule out of the charcoal canister in to the intake to be burned. The bowl vent closeds on some engines at idle so fuel vapors won't be released all the time, esp. when the engine is turned off and is still hot.
A dashpot slows the closing of the throttle, and is usually used only on cars with manual trannys. This helps keep the car from stalling when the throttle is released quickly and the clutch is depressed.

 

[MustangSix]

A dashpot slows the closing of the throttle, and is usually used only on cars with manual trannys.

Actually, they are mostly found on auto transmission cars.

Quickly closing the throttle cuts off the fuel supply and auto cars are under load when in gear, so they die. Manual cars usually don't have that problem.

The Autolite 1100 carbs are only equipped with a dashpot on automatic cars for example, but on other carbs, dashpots are found on manual transmission cars and trucks, depending on year and model.

 

[Anonymous]

Well, I don't have much familiarity with dashpots on fords, so I humbly stand corrected.