Which is stronger 5140 forged pistons or 4310?

Discussion in '96-04 - 4V Specific' started by chuddleston2003, Feb 14, 2016.

  1. chuddleston2003

    chuddleston2003 Member

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    Hey guys and gals I just recently bought an eaton from a member on another forum and looking to forge my engine, just wondering which is stronger the 5140 or 4310? My hp goal is 6-700 hp and I know I will need to upgrade the blower just getting into superchargers now. New to the supercharger stuff. All help and comments are welcome, I will be upgrading the fuel and injectors and all that stuff.
     
  2. white95

    white95 Apex Junky Admin

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    This is an excerpt from a magazine article about crankshafts but contains the information you seek about metallurgy.



    http://www.hotrod.com/how-to/engine/0710phr-crankshaft-tech/

    The pistons in my stroker are 4032 aluminum and piston/rods are 4340. The kit was rated for about 750 HP for example.
     
  3. Pete@FTR

    [email protected] Active Member Preferred Vendor

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  4. 95opal

    95opal Well-Known Member

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    4340 is what you want.
     
  5. 96blak54

    96blak54 Legend

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    Either piston will be fine. Just go along with whats in your price range.
     
  6. BLWNBYU

    BLWNBYU Active Member

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    Wut.... Your pistons aren't steel...

    2618 Aluminum is what you want..
     
  7. Nighttrain

    Nighttrain Well-Known Member

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    4340 is what you want. I deal with metalurgy all day. Its the ideal alloy available right now at a good price because of not only tensile strength but heat extraction. Someone else up above suggested aluminum. For a block and heads maybe because of cooling passages and oil galleries and weight savings its ok. As a piston and rods? No way, itll melt down and bend. I will say aluminum alloys have come along way but for your rotating assembly, no way. Steel alloys is cheaper and more reliable