Engine Displacement Conversions

Discussion in 'Challenger DIY/Tech Info' started by SRT-Tom, Oct 27, 2018.

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  1. Oct 27, 2018 at 6:23 PM #1
    SRT-Tom

    SRT-Tom Well-Known Member Staff Member Super Moderator Article Writer

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    In case anyone is curious, here are the conversions from liters to cubic inches for our current engines and cubic inches to liters for the 60s/70s engines. It's interesting to see that some of the 60s/70s engines are almost the identical size to their new counterparts (e.g., 198 c.i.= 3.2L, 225= 3.9L, 340= 5.6L and 383= 6.3L).

    Current Engines:

    3.5L= 214 cubic inches
    3.6= 220
    5.7= 348
    6.1= 372
    6.2= 378
    6.4= 392 (actually 390)

    60s/70s Engines:

    170 cubic inches= 2.8L
    198= 3.2L
    225= 3.9L
    318= 5.2L
    340= 5.6L
    383= 6.3L
    426= 7.0L
    440= 7.2L
     
  2. Oct 27, 2018 at 6:31 PM #2
    70-426_10-SRT

    70-426_10-SRT B&E body lover

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    Fine, but don't you dare call my 74ci Harley Knuckle a 1200cc
    or my NEW 103ci Twin Cam a 1688cc

    :emotions122: :flipthebird: :nutkick:
     
  3. Oct 27, 2018 at 6:37 PM #3
    SRT-Tom

    SRT-Tom Well-Known Member Staff Member Super Moderator Article Writer

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  4. Oct 27, 2018 at 6:43 PM #4
    70-426_10-SRT

    70-426_10-SRT B&E body lover

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    :supergay:




    There were NO centimeters in 1947 :laughing1:
     
  5. Oct 28, 2018 at 3:20 AM #5
    Mats_B

    Mats_B Member

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    The whole world used and use cm exempt the us even in 1940


    Skickat från min iPhone med Tapatalk
     
  6. Oct 28, 2018 at 9:30 AM #6
    70-426_10-SRT

    70-426_10-SRT B&E body lover

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    And I have been fighting it, and Lead Free Solder, since they tried to introduce it since the '70's

    Of course I also had a problem with my Stealth when people would ask:
    "It that a GT3000?, No Damn it, it a Dodge, see the badging!"
     
  7. Oct 29, 2018 at 2:13 PM #7
    IntimidatorRT

    IntimidatorRT Well-Known Member Staff Member Super Moderator

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    they have been saying that the 5.7 is 345CID. and from my conversion app. 345 Cu in is 5.653Liters
     
  8. Oct 29, 2018 at 6:30 PM #8
    SRT-Tom

    SRT-Tom Well-Known Member Staff Member Super Moderator Article Writer

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    To get a precise figure, you have to convert liters to cubic inches. 5.653 liters is not the same as 5.7 liters. It is off by .047 liters. Dodge just chose to use the rounded up number to get 345 cubic inches. I guess that 345 sounds better than 348.

    See the following calculation:

    1 liter= 61.023744094732 cubic inches

    61.0237441 X 5.7= 347.8353 (348 rounded)


    https://www.conversion-metric.org/volume/litre-to-cubic_inch
     
    Last edited: Oct 29, 2018
  9. Oct 29, 2018 at 6:51 PM #9
    IntimidatorRT

    IntimidatorRT Well-Known Member Staff Member Super Moderator

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    Not to argue but from my unit converter. [​IMG]


    Sent from my iPhone using Tapatalk
     
  10. Oct 29, 2018 at 8:14 PM #10
    70-426_10-SRT

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    O.K. actually, to a precise figure :boxing:

    It is just Bore^2 X Stroke X Number of Cylinders X .7854

    So a displacement of 345 cu in, (5,654 cc)
    has a bore of 3.917 in (99.49 mm)
    and a stroke of 3.578 in (90.88 mm).

    15.3429 x 3.578 x 8 x 0.7854 = 344.928 cubic inches

    :33:
     
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