Volvo RWD 120-130 Forum

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switching engimes 120-130 1968

posted by  bakfrm68 on  Tue Apr 16 11:05 CST 2013
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last visit: Tue Apr 16 11:05 CST 2013
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HELP - I am resurrecting my '68 123GT and had plans to drop a rebuilt taken from another car into the engine bay just prior to painting. However as I got it on the stand to prep it I discovered that it is a B20, and my original is a B18. Can I drp it in, and attach all the working peripherals from MY B18 [ starter, alternator, distributor, CARBS!,etc ] with ease, or are modifications required. My principal concern is carburation will the 20 run with the twins off the 18 - or do I have to source/fit different units? Timing differences? Can anyome provide advice? This discovery has come as a bit of a road bump. I'm in the closing stages of the job - very soon need to get motor in chassis - as my work station rental expires in 2 weeks and I'm concerned motor may take more work than anticipated to get going.

Cheers!








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    switching engimes 120-130 1968

    posted by  planetman on  Tue Apr 16 12:20 CST 2013
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    last visit: Fri Oct 24 09:29 CST 2014
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    Hello,

    A B20 will bolt in place of a B18 and you can use most of the original equipment from you B18.

    In your case, the distributor is the only part that we try to convince our customers to change to a B20 distributor, but it is not mandatory as the B20 will run with a B18 distributor.

    You already should have the dual outlet exhaust manifold, HS6 SU carbs with DX metering needles, 1 1/4" thermostat neck with sealed radiator and expansion tank, all of which are highly recommended for a B20 conversion.
    --
    Eric
    Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
    Torrance, CA 90502








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      switching engimes 120-130 1968

      uid 37336's pic
      posted by  B20Paul. on  Thu Apr 18 12:27 CST 2013
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      last visit: Mon Oct 20 10:54 CST 2014
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      Why DX & not KD?
      --
      Three 164's, Two 144's, One 142 & a partridge in a pear tree.








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        switching engimes 120-130 1968

        posted by  planetman on  Thu Apr 18 21:17 CST 2013
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        last visit: Fri Oct 24 09:29 CST 2014
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        Hello,

        We have found that DX needles work very well in a B20 with a D cam. When properly tuned, the engine accelerates very nicely and gets decent fuel mileage especially when combined with an overdrive. I have gotten almost 30 MPG on my road trips. The only drawback is the idle will be a little rough.

        KD needles work better in a B20 with a C cam.
        --
        Eric
        Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
        Torrance, CA 90502








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      switching engimes 120-130 1968

      posted by  Andrew Nance on  Tue Apr 16 19:39 CST 2013
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      last visit: Fri Jul 26 14:25 CST 2013
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      I just did this and everything from my '67 B18 swapped right over to the '74 B20. The only things I had to change were some of the bolts because at some point Volvo switched from standard to metric blocks. Everything else was fine.

      Planetman, I am still using my B18 (003, I believe) dizzy. What is the benefit of switching to a B20 dizzy?







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