As far as I know, Richard's response is text book
correct. I have never lost any damper oil, though -
that's a weird one. Anyone?
> Since the piston is part of a "closed loop" feedback
> system, it will hunt or
> flutter around it's balance or set point. In this
> steady state mode, the
> dashpot works to filter out this hunting and
> stabilize the piston. The
> thicker the oil, the more dampening to the control
> loop.
>
> Upon acceleration, the dashpot retards the otherwise
> rapid rise of the
> piston in response to the increase in vacuum. This
> increases the velocity of
> the air past the fuel jet and temporarily enrichens
> the fuel mixture
> providing a similar effect as an accelerator pump.
> The thicker the oil, the
> more "accelerator pump" action is achieved.
>
> If the oil is too thin, fluttering at steady
> throttle opening will occur as
> well as stumbling upon acceleration.
>
> Too thick an oil and you will get overly rich and
> sluggish acceleration.
>
> The owners manual for my '74 Midget calls for engine
> oil in the dashpots.
>
> I think most of this is mostly correct. Hope it
> helps.
>
> Richard
> '74 Midget (undergoing Arkley conversion)
> '58 Morris Minor 1000
> '68 MGBGT
=====
Ron Soave
"By trying we can easily learn to endure adversity. Another man's, I mean." -
Mark Twain
Yes, the Yahoo message below annoys me too.
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