Need help for motor choice

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  • MatRacer
    E30 Addict
    • Oct 2008
    • 562
    #1

    Need help for motor choice

    All right, broke on Rod on my S50... The block is good for the scrap yard... The head should be good.

    Here are the two choices I have:

    1- Found a "local" complete S52 with 107k miles with compression number between 193 and 197psi. It comes from a rear ended M3. The car has been hit in 2012. Car moved in a garage in 2013 when the transmission had been removed and the compression was taken. Oil was put in cylinders and motor was rotated. It has been sitting there since then... Price 2000$ CAD.

    2- Buy a rebuilt S52 short block from a "local" well known BMW racing shop and put my head on it. Price: 2000$ CAD + head studs and gasket...

    I like the idea of a fresh block, but the complete engine has its good points also.

    What would you do?
    E30 now S52
    2008 Suburban LTZ (Family and TT hauler)
    325xiT (Sold)

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    Tags: None
    • zcenterb
      R3VLimited
      • Feb 2014
      • 2105
      #2
      Ide go with the rebuilt, that way you don't have any unknowns. Also allows you to build it as you desire, rebuild the head while your at it, cams, valves, etc. Just my 2 cents... Personally a rebuilt sounds way better then a motor that's been sitting 2-3 years...
      CENTERBAR MOTORSPORT - Check out my small Bimmer/Beamer parts and custom projects business!
      Instagram: @centerbarmotorsport
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      The Fleet:
      -1984 325ei Lapis
      -1991 325ix Diamond
      - 2005 X5 4.4i Black Sapphire

      -1972 2002tii Fjord - SOLD 7/8/17
      -1991 325i S50 ///Sterling Silver/// - SOLD 9/15/17

      The Bike:
      -1980 R100RS Inca

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        • JRKOUPE
          No R3VLimiter
          • Dec 2004
          • 3159
          #3
          My s50 sat for 2 yrs before I used it.....


          but go for the rebuilt..and freshen it up smartly.


          I ended up adding parts to mine over the first 2 yrs of driving it..I was stupid not to do it before it was in car....but I was stupid then. The rebuilt just has less unknowns....and u trust the shop....a biggie.

          any idea why rod went rogue on you?
          I love sitting down and just driving!

            Comment

            • M3PO
              E30 Addict
              • May 2012
              • 537
              #4
              My S50 sat dry on a stand indoors for two years also. With that low mileage (mine had 113K), I wouldn't be worried about it. I would change seals and throw it in.

              Alternatively, If I went the other route, I would build a really nasty NA S52 which would be badass but not nearly as cheap as the option above.

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