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Cylinder Wall Thickness: Too Thick?

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  • Cylinder Wall Thickness: Too Thick?

    Is it possible to have too thick of a cylinder wall?

    Hypothetical example: Take a 400SBC block and sleeve the 4.125in bore down to a 4.00in bore. Have the walls gotten too thick and too much heat's going to stay in the cylinder?

    Thinking of taking a larger bore 4.1L Buick V6 block (3.965in bore) and sleeving it down to 3.800in bore for LSR usage both to stiffen the block up as well as meet my displacement limit. The 400SBC reference is intentional since the 4.1L has siamesed bores like the 400SBC while the 3.8L and smaller blocks didn't.

    Thoughts?
    Central TEXAS Sleeper
    USAF Physicist

    ROA# 9790

  • #2
    it'd take longer for it to get up to stable temperatures, but in general, outside of the extra weight.. no problems. With that said, 400s have siamesed walls, and that could be an issue because then you have heat that is further away from its cooling - so there would be vast temperature differences for longer periods of time.... tl;dr is it'd crack.

    that said, I sleeved a 455 to get better wall thickness
    Doing it all wrong since 1966

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    • #3
      How much did having all 8 sleeved run you?
      Central TEXAS Sleeper
      USAF Physicist

      ROA# 9790

      Comment


      • #4
        Originally posted by CTX-SLPR View Post
        How much did having all 8 sleeved run you?
        $100/hole is 'normal' (and what I paid on a 350). That said there are different types of liners, different qualities and thus different costs. In the Buick's case it was $1,200.
        Doing it all wrong since 1966

        Comment


        • #5
          Well I've all but bought a 4.1 block and reading the specs, I should be able to put Melling
          CSL2233 sleeves in there with a direct bore to the block not much beyond what is recommended for a 4.1 anyway.
          4.1L Sleeve
          Bore Initial 3.965in OD: 4.053in, ID: 3.770
          Bore Final 3.800in
          Wall Thickness --- 0.125in
          Bore Length 6in 5.25in
          Stroke 3.40in 2.66in (destroker)
          Original Swept Length 4.75in ---
          Cost $50 6x $22.56
          This seems like it would really truss up the bores staying round. Reinforcing the bottom end however will probably take a girdle.

          Have I gone nuts?
          Central TEXAS Sleeper
          USAF Physicist

          ROA# 9790

          Comment


          • #6
            Originally posted by CTX-SLPR View Post

            Have I gone nuts?
            Of course not.
            Last edited by SuperBuickGuy; August 1, 2018, 10:30 AM.
            Doing it all wrong since 1966

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            • #7
              An now a clapped out Regal to go with it:

              Central TEXAS Sleeper
              USAF Physicist

              ROA# 9790

              Comment


              • #8
                that's quite something that it rusted through the hood but not at the bottoms of the fenders.
                Doing it all wrong since 1966

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