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Question on Bearings

Discussion in 'Engine Building' started by brian11to1, Aug 30, 2006.

  1. brian11to1

    brian11to1 Senior Member

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    Ok, I know I need to plastiguage to get an accurate answer. Well, I need something to work off right? So, my question.

    The bearings I removed my LS shortblock; 6 were green 4 were pink. So, when I get ready to measure for new bearings, do I plastigauge with the old ones or with the new ones?

    Here are some pictures, I made...

    [​IMG]
    [​IMG]

    Do I re-use the old bearings to measure for hte new bearings or.... do i buy a set of new bearings and plastiguage with new bearings?

    Lastly, the rods were stamped 2 on each of them, and the letters on the crank are B A B A, so I would need 2 pink bearings and 2 yellow bearings right?

    Also, what do I do about bearings with eagle rods? I read LSVTEC's post about how all eagle rods except for B16 and H22 use #3 bearing, what color is a #3 bearing?
     
    Last edited: Aug 30, 2006
  2. brian11to1

    brian11to1 Senior Member

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    I guess my question right now is do i use my old bearings to measure for the correct sized new bearing?
     
  3. LateApex31

    LateApex31 New Member

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    Plastigauge isn't 'accurate' at all. If you want a real answer, buy a micrometer and a bore gauge. Measure the main bearing bore, the crank journa diameterl, subtract your desired oil clearance and you now how the desired bearing thickness.

    Main Bearing thickness by color
    Blue 2.013-2.010 mm 0.0793”- 0.0791”
    Black 2.010-2.007 mm 0.0791”- 0.0790”
    Brown 2.007-2.004 mm 0.0790”- 0.0789”
    Green 2.004-2.001 mm 0.0789”- 0.0788”
    Yellow 2.001-1.998 mm 0.0788”- 0.0787”
    Pink 1.998-1.995 mm 0.0787”- 0.0785”
    Red 1.995-1.992 mm 0.0785”- 0.0783”

    Rod bearing thickness by color
    Blue 1.510-1.507 mm 0.0594”- 0.0593”
    Black 1.507-1.504 mm 0.0593”- 0.0592”
    Brown 1.504-1.501 mm 0.0592”- 0.0591”
    Green 1.501-1.498 mm 0.0591”- 0.0590”
    Yellow 1.498-1.495 mm 0.0590”- 0.0589”
    Pink 1.495-1.492 mm 0.0589”- 0.0587”
    Red 1.492-1.489 mm 0.0587”- 0.0586”

    (Credit goes to Earl Laskey for putting together these dimensions). I have found them to be very accurate.

    Short of doing that, you can plastigauge your old bearings and see where they are as far ass the clearance is. Barring any machine work, major wear on the crank, etc, you should be able to use the colors that the block and crank call for. But your best bet is to measure and calculate the bearing thickness you need.
     
  4. B16

    B16 Super Moderator VIP

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    Plastigauge with the new bearings. Get the same color codes, or just get a set of ACL bearings which 99% of the time are within spec.
     
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