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Re: Crank Therapy

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  • Jonsimik
    thx, What the E have to do with it, ona scat E4340 crank? http://www.greatplainsas.com/phubhistory.html
    Message 1 of 38 , Apr 1, 2006
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      thx,

      What the 'E' have to do with it, ona scat E4340 crank?

      http://www.greatplainsas.com/phubhistory.html

      --- In AirVW@yahoogroups.com, "flybynightkarmarepair" <ryoung@...> wrote:
      >
      > --- In AirVW@yahoogroups.com, "Jonsimik" <bigbajon@> wrote:
      > >
      > > ok,
      > >
      > > What about this part?..nitrided 4340 Steel?
      >
      > 4340 and 4140, another commonly used steel, refer to the composition
      > of the steel itself.
      >
      > 4340:
      >
      > Carbon 0.38 - 0.43
      > Chromium 0.7 - 0.9
      > Iron Balance
      > Manganese 0.6 - 0.8
      > Molybdenum 0.2 - 0.3
      > Nickel 1.65 - 2
      > Phosphorus 0.035 max
      > Silicon 0.15 - 0.3
      > Sulphur 0.04 max
      >
      > "AISI 4340 is a heat treatable, low alloy steel containing nickel,
      > chromium and molybdenum. It is known for its toughness and capability
      > of developing high strength in the heat treated condition while
      > retaining good fatigue strength."
      >
      > 4140:
      >
      > Carbon 0.38 - 0.43
      > Chromium 0.8 - 1.1
      > Iron Balance
      > Manganese 0.75 - 1
      > Molybdenum 0.15 - 0.25
      > Phosphorus 0.035 max
      > Silicon 0.15 - 0.35
      > Sulphur 0.04 max
      >
      > "This is one of the chromium, molybdenum, manganese low alloy steels
      > noted for toughness, good torsional strength and good fatigue
      > strength. 4140 is used in a tremendous variety of applications, too
      > numerous to mention here."
      >
      > Nitriding is a surface treatment process that increase the surface
      > hardness, and increases fatique resistance. Read up on nitriding
      > cranks (see from the hanger for December 2005, I think) at
      > http://flycorvair.com
      >
      > The CB Performance cranks are probably sourced in China. The SCAT
      > cranks, used by Revmaster, and Great Plains, are probably (I don't
      > know for sure) Chinese raw forgings processed in the US. That's the
      > $400 difference in price.
      >
      > The crank sitting on the shelf waiting to go in my engine is a forged
      > ChinCom stroker purchased from Aircooled.net if I remember correctly.
      > I don't know if the journals or the whole crank are nitrided.
      >
    • pjb12345uk
      ... makes a lot of sence ... modified to use
      Message 38 of 38 , Apr 3, 2006
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        ---interesting info gary


        makes a lot of sence
        p In AirVW@yahoogroups.com, glgreen232@... wrote:
        >
        > Here's a link to GPAS's history of prop hubs and cranks.
        > Prop Hub History by Great Plains Aircraft Supply Co., Inc.
        > I beleive Aero Vee uses a custome crank and the crankcase is
        modified to use
        > a larger hub end crank bearing.
        > L8R
        > Gary L Greenwell
        > Hudson, OH
        > Sonerai IIL (in progress)
        >
        >
        > [Non-text portions of this message have been removed]
        >
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