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Thread: Damper oil for Hitachi SU Twin carbs

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    Default Damper oil for Hitachi SU Twin carbs

    Recently purchased a set of round top SU carburetors twin Hitachi HJG 46W. What can i use as damper oil for these carburetors that have been sent dried? WIll 3 in 1 oil work? or can i use 10w 30 nissan motor oil?

    Please advise.

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    Registered User psdenno's Avatar
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    Never thought I'd be one to say this........but, did you bother to type "damper oil" in the search box in the upper right corner of the page? Search is a wondrous tool and opens the door to a wealth of collected knowledge.
    Dennis
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    Registered User beermanpete's Avatar
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    3 in 1 seems to go away too quickly. I like using 10W30 engine oil.

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    Barn Find Daily Driver Captain_Zeros's Avatar
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    I personally use 3-in-1 branded straight 20w motor oil, comes in a convenient little squeeze bottle like the normal 3 in 1 and has a picture of an electric motor on it.
    1973 240Z w/ roundtop carbs, 280zx e12-80 distributor, 280zx alternator, late model Altima junkyard electric fans. 115 Blue Metallic & white side stripes.

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    Registered User siteunseen's Avatar
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    3-in-one in the blue and white bottle is what I just used, after searching the archives. The outside temperature matters, from all that I read.
    1972 240Z #918 New Sight Orange
    1977 280Z #305 Light Blue Metallic
    1972 240Z #110 Persimmons Red

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    Nova Scotia,Canada,Earth Blue's Avatar
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    The damper is simple and you only need to remember 3 things:


    1. 30Wt for hot areas, 20Wt for cooler areas (from Mr Matsuo).

    2. The oil just dampens the piston from bouncing when going over bumps and from engine vibrations.

    3. The oil regulates how fast the piston rises and falls when transitioning throttle.


    If the oil is thick, the piston will rise slower and there will be more depression (vacuum/suction) at the bridge and it will pull more fuel from the jet. Think of it as a pseudo- acceleration enrichment circuit. It has the opposite effect on deceleration; with thicker oil it will fall slower and pull less fuel.
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
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    Nova Scotia,Canada,Earth Blue's Avatar
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    Default Mat-SU-o

    btw Mr. Matsuo has SU in his name

    Click image for larger version. 

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    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


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    I have used ATF in my carbs for sooooo long I'm still taking it out of a cardboard can...... These really are the world's crudest shock absorber. I've micced enough of them to say with some assurance that there are two different sizes of pucks......so as you are fiddling for your solution play on......
    Bruce Palmer
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    Registered User siteunseen's Avatar
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    Quote Originally Posted by Bruce Palmer View Post
    I have used ATF in my carbs for sooooo long I'm still taking it out of a cardboard can
    That's Commandment #11.
    1972 240Z #918 New Sight Orange
    1977 280Z #305 Light Blue Metallic
    1972 240Z #110 Persimmons Red

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    Newbie ninjazombiemaster's Avatar
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    ATF works horrible for me. I've run 20wt motorcycle oil with best effect.
    1973 240z w/ ztherapy round top conversion.

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    Administrator bpilati's Avatar
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    Quote Originally Posted by Blue View Post
    btw Mr. Matsuo has SU in his name

    Click image for larger version. 

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    And a pic of you holding an SU.
    Bryan Pilati
    1971 Datsun 240Z (8/71; 920 paint)
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    What about using 3 in one multipurpose oil? Will it work? I dont seem to find 3 in one motor oil here in Panama. Just this one:

    3-IN-ONE Multi-Purpose Oil | Household Oil | Lubricate Bikes, Guns & More

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    1972 240Z #918 New Sight Orange
    1977 280Z #305 Light Blue Metallic
    1972 240Z #110 Persimmons Red

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    Administrator bpilati's Avatar
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    Quote Originally Posted by Blue View Post
    btw Mr. Matsuo has SU in his name

    Click image for larger version. 

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    Too bad he doesn't have V8 in his name.
    Bryan Pilati
    1971 Datsun 240Z (8/71; 920 paint)
    IZCC #583; TZCC #16; CZC #110
    I'm never serious unless I should be.

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