Volvo RWD 444-544 Forum

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SU carb pistons and domes 444-544

posted by  MrV on  Thu Sep 19 08:43 CST 2013
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last visit: Fri Oct 24 10:15 CST 2014
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Does anybody know if the damper pistons and domes are interchangeable between the 2-bolt and 3-bolt SU carbs? I have a box of cores and not sure which came from which.
dean








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    SU carb pistons and domes 444-544

    uid 779's pic
    posted by  matt b on  Sun Sep 22 16:09 CST 2013
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    last visit: Tue Oct 14 16:33 CST 2014
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    in addition to what others said...

    Check needles, best to keep them matched. And late carb pistons have that damn self centering thing going on, which is great when it works, but in my opinion, rarely does..

    --
    -Matt I ♥ my ♂








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    SU carb pistons and domes 444-544

    posted by  Bruck on  Fri Sep 20 08:09 CST 2013
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    last visit: Tue Oct 7 13:32 CST 2014
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    All S.U. HS6 castings should be machined to the same dimensions and tolerances. Thus all your HS6 parts should be interchangeable.That said, it would be wise to check internal and external dimensions.
    All the best, B








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      SU carb pistons and domes 444-544

      posted by  derek uk on  Fri Sep 20 17:32 CST 2013
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      last visit: Fri Oct 24 12:33 CST 2014
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      Yes, you'll want a well matched pair when checking the piston drop time. Don't clean the inside of the domes with anything abrasive, the fit needs to be tight but smooth as it relies on vacuum to lift the piston.








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        SU carb pistons and domes 444-544

        uid 4846's pic
        posted by  JohnMc on  Mon Sep 23 07:54 CST 2013
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        last visit: Thu Oct 23 07:42 CST 2014
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        Yeah, they're machined to have a fairly calibrated air gap/leak around the pistons. There's no seal - so the small gap is pretty critical to maintaining the balance of vacuum in the carb throat to the amount of piston lift.

        I'm not sure how much individual hand fitting went on in the SU assembly line, but if it's like anything else from the 60's British automotive industry, there was probably more than you'd like to think.
        --
        '63 PV544 rat rod, '93 Classic #1141 245 (now w/16V turbo)







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