Volvo RWD 444-544 Forum

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compression ratio 444-544

posted by  cruzin on  Sun Feb 13 07:37 CST 2011
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last visit: Fri Aug 5 06:16 CST 2011
[RELATED]

whats the difference between an B18 "b" and B18 "d"? how do you tell?
I know one has 8.5-1 the other has 9.5-1 compression








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    compression ratio 444-544

    posted by  walrus3 on  Sun Feb 13 17:21 CST 2011
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    last visit: Mon Dec 2 14:20 CST 2013
    [RELATED]

    Depending on the year, some of them also have a different cam.
    There will be a motor type number on the side of the block, starting with 4968 and
    several more digits. If you post the first 6 digits I can tell you which type
    and
    which cam it had. The first digits are cast and the rest are stamped in a rectangular
    boss next to the cast numbers on the left side of the block at the top above the dipstick.








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      compression ratio 444-544

      posted by  cruzin on  Tue Feb 15 07:28 CST 2011
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      last visit: Fri Aug 5 06:16 CST 2011
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      thanks but car is gone now, so no way to get no's








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        compression ratio 444-544

        posted by  Volvo From Heck on  Tue Feb 15 08:29 CST 2011
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        last visit: Mon Oct 13 20:56 CST 2014
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        Are you're saying you have the cylinder head from this unidentified motor and want to know the compression ratio? Measure the deck height--the distance between the machined surface for the valve cover and the bottom of the head. I don't have the specs but someone on the BB will. The difference will be something like a few mm. -- Dave








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          compression ratio 444-544

          posted by  Phil S. on  Tue Feb 15 12:14 CST 2011
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          last visit: Fri Oct 24 13:18 CST 2014
          [RELATED]

          From memory...

          The low-compression B18A/D head is 3.465" thick.

          The high-compression B18B head is about 3.390" thick.








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            compression ratio 444-544

            uid 32173's pic
            posted by  Gary L on  Wed Feb 16 05:24 CST 2011
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            last visit: Wed Oct 22 10:26 CST 2014
            [RELATED]

            From the factory shop manuals, here are head thickness vs compression ratio numbers for a variety of B18 engines:

            88.0 mm (3.465") = 8.7 - B18D
            87.0 mm (3.425") = 9.5 - B18B early (type 1)
            86.2 mm (3.394") = 10.0 - B18B late (types 2,3)

            There are small inconsistencies across manuals, dependent on year of publication. The above numbers were taken from the B18B/D manual published 3/69.

            Pretty good memory, Phil... we'll forgive the .004" error! :-)
            --

            Gary L - 142E ITB race car, 73 1800ES
            BlueBrick Racing Website
            YouTube Racing Videos







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