Vehicle & Technical > Range Rover

what does the dash pot do?

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anaxemurderer:
What exactly does the dash pot do on my su carbs? As i understand it operates as a damper for the needle. Why did unscrewing the dash pot top whiles the engine was running lower the revs and subsequently upset running? Topping up dash pot and unscrewing whilst engine stopped has sorted it but i am curious!

Nick
3.5 V8 bobtail rrc

thermidorthelobster:
IIRC when you unscrew and withdraw the plastic cap it pulls the whole piston assembly upwards and hence pulls the needle right open.  So it'll overfuel like mad.

Rossko:
The damping also produces a accelerator pump effect. Other carbs have a physical pump to add a dollop of extra fuel when you floor the pedal. SU & Stromberg have the dashpot to slow down the piston movement and give an equivalent temporary fuel richening. Elegant solution :)

cheers, Ross K

greasemonkey:
You just need to keep the oil topped up otherwise they do stop working right though
Cheers
Steve

anaxemurderer:
Yeah thats roughly what i thought and makes a lot of sense when i think about the symptoms. They don't normally cause problems it was just because they were unscrewed whilst it was running, must have displaced some oil.

Cheers

Nick

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