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Thread: The " other " 259........

  1. #1
    President Member shifter4's Avatar
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    The " other " 259........

    Here's the other 1955 259 cid USA built V8 that was contemporary to the Stude 259. Both are the same Bore / stroke .

    https://en.wikipedia.org/wiki/Polyspheric


    Also :

    http://www.geocities.com/MotorCity/Track/4164/55.htm
    For Plymouth in 1955 the biggest news of the year was, of course, the “new”
    V-8 engine. The engine was not really new and was supplied to Plymouth by Dodge
    division until a new engine foundry could be completed to supply Plymouth with its
    own engines. Plymouth’s first true V-8 would not appear until 1956, and then only
    slightly changed from the Dodge version.
    At first the Plymouth V-8 was offered in two displacements-a 241ci rated at
    157hp with a bore and stroke of 3.44x3.25 in. and a 167hp, 260ci engine with a
    larger bore of 3.563 in. Both engines featured a compression ratio of 7.6:1. Shortly
    after introduction, a four barrel 177hp version of the 260 hit the streets. Maximim
    torque was achieved at 2400 rpm on all engines, the 241 pumping out 217-ft and the
    260 claiming 231lb-ft whether 2 or 4 Bbl equipped. Called the Hy-Fire V-8, it was
    Plymouth’s first version of a Poly engine.
    The Hy-Fire engine achieved some of a Hemi’s free-breathing characteristics
    by placing intake and exhaust valves opposite each other in the combustion
    chamber. This provided better breathing while not restricting valve size as was the
    case in some other small block engine designs. The design not allowed adequate
    “breathing” on the intake cycle but allowed the exhaust valve to open further into
    the combustion chamber to exhaust spent gasses. Thus creating one of the famous
    features of a Poly head.
    Bill H
    Daytona Beach
    SDC member since 1970
    Owner of The Skeeter Hawk .

  2. #2
    Silver Hawk Member 52-fan's Avatar
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    I had some experience with Polysphere 318s. They were tough engines and not bad performers in their size range.


    "In the heart of Arkansas."
    Searcy, Arkansas
    1952 Commander 2 door. Really fine 259.

  3. #3
    President Member RadioRoy's Avatar
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    Ford also had a 260, around 1964 or so.
    RadioRoy, specializing in AM/FM conversions with auxiliary inputs for iPod/satellite/CD player. In the old car radio business since 1985.

    17A-S2 - 50 Commander convertible
    10G-C1 - 51 Champion starlight coupe
    10G-Q4 - 51 Champion business coupe
    4H-K5 - 53 Commander starliner hardtop
    5H-D5 - 54 Commander Conestoga wagon
    56B-D4 - 56 Commander station wagon
    60V-L6 - 60 Lark convertible

  4. #4
    President Member
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    That "Plymouth" 259 was also used in the Dodge pickups in 55 and 56. I had one.
    KURTRUK
    (read it backwards)




    Nothing is politically right which is morally wrong. -A. Lincoln

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