Best aluminium grade for con rods

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Best aluminium grade for con rods

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  • #33999
    Dougie Swan
    Participant
      @dougieswan43463
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      #591938
      Dougie Swan
      Participant
        @dougieswan43463

        Hi

        As the title suggests I'm looking for advice regarding the best grade of aluminium to make con rods from

        I'm also looking for a UK supplier of flat bronze bar

        Thanks in advance

        Dougie

        #591941
        Emgee
        Participant
          @emgee

          HE15 is suitable for conrods and other highly stressed parts, 7075T6 may be an alternative.

          Emgee

          Edited By Emgee on 29/03/2022 16:40:15

          #591943
          bernard towers
          Participant
            @bernardtowers37738

            I think HE15 is used for that. new number is 2014 T6

            Edited By JasonB on 29/03/2022 16:52:41

            #591950
            JasonB
            Moderator
              @jasonb

              I always go for 2014 which is the old HE15

              M-machine do bronze flats or cut from sheet as well as doing 2014. I usually e-mail Lynn a list of what I want and se sends back an invoice then I phone her with card details.

              #591954
              Dougie Swan
              Participant
                @dougieswan43463

                Thanks for the replies and thanks Jason for where to get it

                Regards

                Dougie

                #591955
                JasonB
                Moderator
                  @jasonb

                  Sometimes cheaper to get round 2014 than rectangular.

                  #592026
                  Andy_G
                  Participant
                    @andy_g

                    Is there any problem using 6082 / HE30 for conrods?

                    (In T6 condition)

                    Edited By Andy_G on 30/03/2022 11:00:01

                    #592034
                    Emgee
                    Participant
                      @emgee
                      Posted by Andy_G on 30/03/2022 10:58:16:

                      Is there any problem using 6082 / HE30 for conrods?

                      (In T6 condition)

                      Edited By Andy_G on 30/03/2022 11:00:01

                      Andy, check the material data sheets for a detailed answer, then decide if you want to risk using 6082T6 in an engine that has taken many hours to make.

                      I have no doubt there are some running engines with HE30 con rods that perform well over a period of time.

                      Emgee

                      #592041
                      Andy_G
                      Participant
                        @andy_g

                        Wow, I didn't realise that 2014 was so strong – especially in T651 condition. Question answered.

                        #592051
                        JasonB
                        Moderator
                          @jasonb

                          There is a risk of 6082 stretching and the holes going oval.

                          Also if it is a design where there are no separate bearing shells as you often find in small model IC engines then the copper content of the 2014 makes for a much better wear surface.

                          #592101
                          Andy_G
                          Participant
                            @andy_g

                            Thanks Jason.

                            #592128
                            Bill Pudney
                            Participant
                              @billpudney37759

                              The chart had a fairly common types of Al Alloy, with the types of material for small conrod. ……….

                              #592134
                              Bill Pudney
                              Participant
                                @billpudney37759

                                Sorry, I seemed to have lost the chart.

                                Somewhere.

                                I will try and find it.

                                cheers

                                Bill

                                #592311
                                Ron Laden
                                Participant
                                  @ronladen17547

                                  Would aluminium bronze be a good conrod material I think it is known for being a strong alloy..?

                                  #592364
                                  Andy_G
                                  Participant
                                    @andy_g
                                    Posted by Ron Laden on 01/04/2022 07:57:08:

                                    Would aluminium bronze be a good conrod material I think it is known for being a strong alloy..?

                                    With my recently refreshed knowledge of the aluminium alloy properties, I offer the following:

                                    Generic data on aluminium bronze seems to suggest that the yield strength is of the order of 250 MPa.

                                    (Source)

                                    6082 T6 yield strength is ~240 MPa in sheet form and up to 270 MPa in bar form (depending on size).

                                    (Source)

                                    2014 T6 sheet has a yield strength of ~380 MPa and bar in the T651 condition >420 MPa

                                    Note that 2014 in the T4 condition is back at ~250MPa

                                    (Source)

                                    Obiously this is generic data for the aluminium bronze, and there may be specific grades with higher strength. However the other down-side of aluminium bronze is its density: circa 7.6 vs ~2.7 for aluminium alloys, so an aluminium bronze conrod would be almost 3 times the weight of an aluminium alloy one which in itself will increase the loading on it (and the rest of the engine!) and probably give rise to balancing / vibration problems.

                                    £0.02p

                                    Edited By Andy_G on 01/04/2022 11:32:01

                                    #592372
                                    David-Clark 1
                                    Participant
                                      @david-clark1

                                      When I used to machine two stroke con rods professionally, there was a half bearing shell in the main body and the rest of the big end was just aluminium. The designer calculated the load as not requiring a full bearing.

                                      #592495
                                      Neil Lickfold
                                      Participant
                                        @neillickfold44316

                                        A very good grade is 2024. It can be used without bushes in the small end and the big end. It used to be used for conrods for control line speed engines. I still use it for F2A conrods, but now leaded bronze2 is used in the Big end, but these engines are revving up 41krpm. The small end is left un bushed and works very well.

                                        #592497
                                        JasonB
                                        Moderator
                                          @jasonb

                                          America tend to use 2024 and UK 2014 as they are the commonly available grades.

                                          "Bronze" is quite often used in model engines, look through the various casting kits available and you will find the conrods supplied as castings as they can be produced without the need for heat treatment and provide a good bearing surface. Several of Wesrbury's IC engines use it as did the 2 & 4 Stroke engines from Wall in the US

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