rods and pistons

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  • s2dude
    S2Forum Extremist
    • Nov 2005
    • 1631
    • Country: United Kingdom

    #31
    Originally posted by QuattroFever
    I will ask for you, but i think the reason they discount a group buy is the machine is already set up. Let me double check.



    I am after titanium really. I want as little weight as poss. but with as much strength.

    If this group buy doesn't kick off and you know of some lightweight steel rods that can take good power then give me a shout.

    You wont see any benefit for a roadcar (or road/strip car) IMHO

    Basically for high revving low capacity naturally aspirated engines then maybe....especially motorbike engines as Arrows own info illustrates



    Much wiser to invest the ££ into a Garrett GT**r and see better spool up time and resultant performance.

    Comment

    • Floddy
      S2Forum Addict
      • Dec 2003
      • 222
      • Country: Sweden

      #32
      Originally posted by s2dude
      Basically for high revving low capacity naturally aspirated engines then maybe....especially motorbike engines as Arrows own info illustrates
      Now I'd like to have a high revving turbocharged I5! =D

      Wonder what it sounds like at 10krpm?
      Red cars are the fastest ones...
      - Team Irry -

      Comment

      • QuattroFever
        S2Forum Extremist
        • May 2006
        • 1360
        • Country: United Kingdom

        #33
        10k sounds like a sweet target to me!!!
        Volcano ABY coupe

        Ant

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        • QuattroFever
          S2Forum Extremist
          • May 2006
          • 1360
          • Country: United Kingdom

          #34
          Originally posted by aelred
          I could be interested, but I assume that they have to be all the same in order to get the discount. I would want mine with some mods and different size wrist pin.
          Sorry mate looks like there's no discount at all now.

          I spoke to russell at arrows and this is what he told me.

          "Dave must have been on another planet when he quoted you that, he must have quoted you for motorbike rods. We can supply those rods for 650 each and 100 discount for a group buy, it doesn't matter how many people you get we can only offer you 100 discount"

          Motorbike rods?!?

          I told him exactly what engine it was. Audi S2 2.2 5cyl turbo. Sounds like some motorbike!!!

          If I can't get a good deal stateside what do those pauters translate into GBP!
          Volcano ABY coupe

          Ant

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          • QuattroFever
            S2Forum Extremist
            • May 2006
            • 1360
            • Country: United Kingdom

            #35
            Originally posted by Billman
            How much does these titanium rods wheight? I want a number not a Prercentage.
            Approx 380grams a piece.

            You save just under a kilo over five rods.
            Volcano ABY coupe

            Ant

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            • Corey
              Banned
              • Sep 2003
              • 2793
              • Country: United Kingdom

              #36
              Originally posted by QuattroFever
              10k sounds like a sweet target to me!!!
              You'd also need to look at improving the valvetrain to achieve that.
              Corey
              01636 822288

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              • Billman
                S2Forum Freak
                • Nov 2004
                • 4129

                #37
                Originally posted by QuattroFever
                Approx 380grams a piece.

                You save just under a kilo over five rods.
                The 380 grams are for the I5 rods or for motorcycles.

                and for 10000 Rpm you must also do something for your crank. People revving so far have crank problems with the oil on the crank bearings. As it happens the crank is touching th eberings (no more oil film) and the engine flys!
                Go Holset or Go RS4

                Comment

                • QuattroFever
                  S2Forum Extremist
                  • May 2006
                  • 1360
                  • Country: United Kingdom

                  #38
                  I would love to take it to 10000 but it's not something I think i'd want for a daily driver. I think 10k is a bit ambitious. 8500 is prob. more where i'll end up.

                  drifting off the subject a bit. whats the weak points in the valvetrain at those sort of rpm(10k)? springs?
                  Volcano ABY coupe

                  Ant

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                  • QuattroFever
                    S2Forum Extremist
                    • May 2006
                    • 1360
                    • Country: United Kingdom

                    #39
                    how about rifle drilled rods?
                    Volcano ABY coupe

                    Ant

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                    • aelred
                      S2Forum Maniac
                      • Jan 2005
                      • 761
                      • Country: United Kingdom

                      #40
                      To take it to past 8K rpm is not as simple as just rising the rpm limiter,
                      You need to change lifter to solid one, light weight valve gear, standard oil pump is no good and other mods to block, crank etc
                      Aelred

                      Comment

                      • QuattroFever
                        S2Forum Extremist
                        • May 2006
                        • 1360
                        • Country: United Kingdom

                        #41
                        really what mods to the block!

                        I've heard 5cyl volvo diesel is similar. oil pump any different??
                        Last edited by QuattroFever; 24 August 2006, 20:18.
                        Volcano ABY coupe

                        Ant

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                        • QuattroFever
                          S2Forum Extremist
                          • May 2006
                          • 1360
                          • Country: United Kingdom

                          #42
                          Don't want to end up with this!!!

                          Volcano ABY coupe

                          Ant

                          Comment

                          • aelred
                            S2Forum Maniac
                            • Jan 2005
                            • 761
                            • Country: United Kingdom

                            #43
                            Exactly!
                            Some oil galleries need to be modded, strengthening of the block etc. etc.
                            Aelred

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                            • corrado
                              S2Forum Fanatic
                              • Jan 2005
                              • 71
                              • Country: United Kingdom

                              #44
                              For such high rpm you most definatley want to go with a better oil delivery (dry sump) setup or such. You are reaching high piston speed, everything must be lightened starting from normall pulleys, lose ac, electric pump?, crank, flywheel, valve gear, solid lifters to avoid valve float, light pistons/rods, balance everything.

                              Everything must be planed corectly to make use of the high revs, like type of cams used, turbo size ect. It really comes down to what you want the car to do? 1/4 mile or track car ect ect.

                              Honda engines are known for high revs and big hp. On a 1.8l 16v honda tuners achieve 700-800whp, all done through proper engine breathing, high revs and high volumetric efficiency and huge turbos. Power comes at 6k but you usually jump from 200whp to 800whp in 2000 rpm

                              That pic of the block in half its of a 16v vw engine who apparently went close to 1000hp, i doubt it broke in half becasue of the power, more likley an imbalance/stress build up in the block. I have seen similar blocks savaged like that in tractor pulling, nuts.

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                              • Floddy
                                S2Forum Addict
                                • Dec 2003
                                • 222
                                • Country: Sweden

                                #45
                                Originally posted by QuattroFever
                                Don't want to end up with this!!!

                                And that one DOES have a dry sump..
                                Red cars are the fastest ones...
                                - Team Irry -

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