My understanding is that the oil delays the opening of the dashpot on
accelleration, temporarily enriching the mixture. This substitutes for
the acceleration pump found on American carbs used at the time.
Tony Rhodes wrote:
>
> Message text written by INTERNET:jonmac@ndirect.co.uk
> >The idea behind oil in the dashpot is to stop the piston fluttering<
>
> Is it just to stop the fluttering? My understanding is that the viscosity
> does
> play a part in the degree of damping which controls the amount of
> enrighment.
> I must say that I never noticed any problem with the 10w40 I always used to
> use!
> Maybe 20W50 or 40 is even closer to the intended viscosity than 10w-40.
>
> When I lift with my finger, even the 10w40 seems to cuase a lot of
> resistance in the dashpot.
>
> -Tony
--
George Richardson
'57 TR3, TS15559L - painting and reassembling....
http://www.merlingroupinc.com/tr3.htm
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