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 Posted: 01-10-2020 09:45 pm
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jomac
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What is the correct oil level in stromberg carbs.
I am looking for a reference dimension.
Measuring from the top of the casting opening to the
oil level in the fill tube. The manual says top off oil level. what is the favorite oil of choice? I use my 20w50 engine oil.

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 Posted: 01-11-2020 12:41 am
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redracer
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we don't use "oil" as the old SU carbs with their massive aluminum piston did. The Strombergs have the rubber diaphragm which lightens the "massive" weight of the original SU piston but which will get "eaten" up by regular oil. Instead, we use ATF which will not harm the "rubber"(in fact will slightly expand the diaphragm if it get on it) and just fill to the top: any overflow will clean up some carbon build up(has been used extensively for ages just for this).
So: use ATF but no regular petroleum based oils.

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 Posted: 01-11-2020 03:03 pm
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pokeyjoe
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Moss Motors sells this stuff. It might be repackaged ATF. I have no idea. Click on the pic for the link.

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 Posted: 01-14-2020 04:44 pm
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Esprit2
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The viscosity of the damper oil is to a Zenith-Stromberg what the accelerator pump setting is to a Dellorto or other 'normal' carb. The viscosity influences how quickly the piston reacts (rises/ falls) to a change in throttle. The viscosity is only right for the task when proper consideration is given to how the carb is set-up (jet size and height, damper spring, needle selection and it's adjustment).

The oil viscosity specified by different engine manufacturers varies because their carb set-ups vary first, then the damper was tuned as required to provide the additional rich/ lean condition that was required during throttle transition. Just randomly changing the oil viscosity ignores all of that. Or, if you go down that road, at least pay attention to how the engine's throttle response changes as a result. Don't blame subsequent changes to throttle response on something else, and go off on another Witch Hunt.

Regards,
Tim Engel

Last edited on 01-14-2020 04:45 pm by Esprit2

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