Siamsed Cylinders

[Deleted User]
[Deleted User]
edited November -1 in HUDSON
What is the engineering purpose of having our Hudson engines with "Siamesed" cylinders? I can find nothing to explain the benefits of this design.

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  • [Deleted User]
    [Deleted User]
    I stand corrected. I guess my search string was in error. I see now that by this configuration a 4 cylinder engine can be reduced by 25% in length of block. So space saving is one reason.



    I got get my fat fingers on the keyboard checked. I can hear Mavis Beacon screaming!!!!
  • Unknown
    Unknown
    Bascially to get a 'compact' (short) cylinder block.
  • Hudsy Wudsy
    Hudsy Wudsy Senior Contributor
    I find it a bit ironic that this subject should come up on the same day that I replaced frost plugs on a 262. I'm always amazed at how much settled soggy, rusty and flaky debris I find when I look inside the water jackets of a Hudson six. I've been in Mopar sixes and I've never seen anywhere near as much crud. I was musing to myself just a few hours ago whether the cooling systems in our beloved Hudsons circulate as well as they would if the cylinders weren't paired, or whether the water pump design was somewhat defficient. I'm not at all suggesting that they have a fatal design flaw, I'm just curious if others of you have found what you feel is an inordinate amount of settled coolant system sludge in Hudson six blocks.
  • Geoff
    Geoff Senior Contributor
    It is particularly bad on 212 blocks, which are siamesed in triples. they had to do it this way to get the bore up to 3" without inc reasing the length of the block, and it was obviously cheaper to use existing boring tools. That is why they went to pegged rings, as the distortion between the cylinders meant the rings had to be kept in the same position circumferentially or they did not seal properly. Goes against all recommended engineering practices to have all the gaps in a row, but hey, it worked, so why worry!

    Geoff.
  • Hudsy Wudsy
    Hudsy Wudsy Senior Contributor
    Geoff C., N.Z. wrote:
    It is particularly bad on 212 blocks, which are siamesed in triples. they had to do it this way to get the bore up to 3" without inc reasing the length of the block, and it was obviously cheaper to use existing boring tools. That is why they went to pegged rings, as the distortion between the cylinders meant the rings had to be kept in the same position circumferentially or they did not seal properly. Goes against all recommended engineering practices to have all the gaps in a row, but hey, it worked, so why worry!

    Geoff.



    Absolutely fascinating! I had no idea that that was the reasoning behind the fixed position of the rings.
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