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SU carburetor damper oil

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A

aroostok

Jedi Hopeful
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Since it gets pretty cold up here in the northeast does anybody recommend changing the carburetor damper oil on dual SU HS4s for the winter and, if so, to what?
Right now I'm running 20W-50 castrol.
 
Or Marvel Mistey Oil.

About the same viscosity.
 
Moss sells a lightweight oil meant specifically for SU dampers. I don't know how it reacts to extreme cold, but it's been fine through the So Cal winters which get down to around 20-degrees. I've used it for many years in all seasons.
 
ATF for me!
 
I guess I'm the only one dumb enough to buy the Moss Motors "special" damper oil lol. Actually needed to round out an order to make the next level for a better discount.
I agree about the ATF unless someone has made an actual study as to the best and would care to share their findings.
 
Engine oil for street use, lighter oils for raceing.
 
Doug, as mentioned above I also use the Penrite SU oil from Moss. I've never found any advantage to other oils in my climate for any of my cars. YMMV.
 
DrEntropy said:
Or Marvel Mistey Oil.

About the same viscosity.
Click to expand...

I've used it for years Doc! Great top lube when added to the gas. When shutting down an engine for a long period of time, spraying it in the carbs just before shutdown pre-lubes the uppers and will not foul up the plugs. A little puff of smoke when you first start up, then clean as a whistle. My dad actually used it race cars many years ago. But I don't know how.
 
I'm an ATF fan here also...

Willing to try something even lighter if I could find it.
 
In the winter you might want to keep the same oil as you may get a lean miss on acceleration if the piston rises too fast, in any event I think the advantage of switching would be barely noticable if at all.

Funny story to tell, first british car, nearly 30 years ago, of course I wanted it to go faster/perform better, I filled the dashpots with WD40, on the thinner oil is better theory as described above.

Ran like poo, would miss terribly when you tried to accellerate. The oil in there does serve a function, I have always heard straight 20 weight, ATF, will work, I have used those, plus the Moss stuff, plus lighweight motor ooil over the years, all worked exactly the same from a seat of the pants driving evaluation, except the above mentioned WD40 of course.
 
20W-50 Castrol year round here... Then again, it don't get as cold here as it does in PA...
 
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