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randrhotrodimports
20-05-10, 12:41 PM
Got as friend needing to know what grade/type oil to put in his 1 1/2 SU,S on his jag motor. Anyone know?
Thanks Russ
53anglia
20-05-10, 12:46 PM
Russ,
SAE 20 is recommended.
randrhotrodimports
20-05-10, 12:53 PM
Lovely thank you very much,:)
Russ,
SAE 20 is recommended.
Blackjack
20-05-10, 01:24 PM
If find that the best of all is Citroen LHM (also used in Rolls Royces) - better even than the special dashpot oil Burlens sell. Buy a litre for £5.99 and it'll last forever. You can also mix oils to get exactly the viscosity you want.
stueeee
20-05-10, 01:34 PM
You can also mix oils to get exactly the viscosity you want.

x2 yes, well worth doing.

Thicker oil equals a greater accelerator pump effect on SU carbs, in complete contradiction of the opinion of many "experts".

Stuart.
Blackjack
20-05-10, 02:19 PM
Slows the rise of the piston - so richer for longer.
Morris460
20-05-10, 02:34 PM
It's richer because the piston rises slower than the aidemand would dictate, this means more depression due to increased velocity, therefore more fuel pulled through the jet
hotroddickie
20-05-10, 03:53 PM
I always used 3 in 1 when I ran SU's
it's quite thin.
Rich
Blackjack
20-05-10, 05:55 PM
Insert plug for Gibbs Brand here -------->