On Fri, 21 Apr 1995, Agustin de la Calle wrote:
>
> > I have a couple of questions for a friend and myself over restoring
> > a 68
> > MGB. First, what oil should I use in the carburettor dashpots?
> > Castrol 20w50
> > was my thought...since I was told 20 weight but I am unable to find
>straight
> > 20.
> Benji,
>
> Use light motor oil. Also good results shows Marvel's Mystery Oil (MMO).
> You don't need to buy the original SU dashpot oil.
>
I've tried MMO in my HIF4s... not good. I switched to 20W50 and like it
much better. Plus it is convenient since the engine uses the same.
In the Triumph (HS2s) I do use MMO and it works fine. So, I wonder what
is really appropriate for HS4s on an MG?
In any case, my impression is:
Oil Too Thin: Hesitation on throttle increase (mixture leans momentarily),
Car accellerates better with richer mixture (or choke on).
RPMs go up quickly after the hesitation.
Oil Too Thick: Smoke and/or smell on throttle increase (mixture richens
for a short period). Car accellerates better with
leaner mixture. No hesitation but throttle response
is slow.
John M. Trindle | jtrindle@tsquare.com | Tidewater Sports Car Club
'73 MGB DSP | '69 Spitfire E Stock | '88 RX-7 C Stock
Home Page: http://www.widomaker.com/~trindle
"9. Creativity is great, but plagiarism is faster. (The fifth law of
reality.) - Jack Neafsey"
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