>What type of oil should be used?
SU dash pot oil is the recomended oil. What else?
>From
THE S.U. VARIABLE CHOKE CARBURETTOR
Text & Illustrations by Malcolm Land
http://www.zparts.com/zptech/articles/mal_land/ml_sucarb2/images4/SUcarb_111
601b.htm
Too often people use light duty (sewing machine or general purpose) oil in
the dash pot assembly. This type of oil does little if anything to impede
the upward movement of the piston as the throttle opens.
Engine oil can be too viscous (depending on climate). After 2 hours of
driving it ends up in the bottom of the piston, the majority of it sucked
into the engine. This happens because it is too thick to pass through the
damper as the piston falls causing the oil to flow out of the top of the
dashpot.
I use a mix of 20W-30 to 20W-50 and sewing machine oil. The ratio is three
parts engine oil to one part sewing machine oil.
When you use the aforementioned oil mix if you attempt to raise the piston
when the engine is cold you will find that a lot of force is required to
move the piston to its uppermost position. When you release the piston, it
will drop to the bridge quickly (less than half a second).
Ed Bratt
1976TR6
Regina, Sask.
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