AAN engine rebuild

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  • hunker7
    S2Forum Possessed
    • Mar 2014
    • 3487
    • Home: Latvia Current: United Kingdom

    #16
    How to know which rods are good and which better be left alone? Quick ebay search came up with these

    http://m.ebay.co.uk/itm/321349979826?nav=SEARCH

    What part number for the clutch?
    '93 Audi 100 Avant - R.I.P
    '92 Audi UrS4 Avant - SOLD
    '93 Audi UrS4 Avant
    '15 Audi A7 quattro 3.0 TDI

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    • Rusty
      Super Moderator
      • Jun 2004
      • 18953
      • Country: United Kingdom

      #17
      FCP engineering rods have received positive comments and are what I'll be going for. There are also some that come up on here every now and again. I think Colesy had some for sale a while back at £350 and biturbo was selling some Scats secondhand for £250.
      Cheers'en, AndyC
      1994 ABY Coupe - Projekt Alpinweiss

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      • hunker7
        S2Forum Possessed
        • Mar 2014
        • 3487
        • Home: Latvia Current: United Kingdom

        #18
        Quite steep at £380 what sort of power/torque can stock rods take?
        '93 Audi 100 Avant - R.I.P
        '92 Audi UrS4 Avant - SOLD
        '93 Audi UrS4 Avant
        '15 Audi A7 quattro 3.0 TDI

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        • Rusty
          Super Moderator
          • Jun 2004
          • 18953
          • Country: United Kingdom

          #19
          Steep? Not for new rods, that's about what they've always been for Scat / Aron rods (don't forget exchange rate has changed...)

          H beam have been used in loads of big power builds, X beam are supposed to be even higher rated still.
          Cheers'en, AndyC
          1994 ABY Coupe - Projekt Alpinweiss

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          • hunker7
            S2Forum Possessed
            • Mar 2014
            • 3487
            • Home: Latvia Current: United Kingdom

            #20
            I understand that, but if stock rods can handle RS2 power, then can't justify spending £400, just in case I go mad with the power in future (which is very unlikely).

            I'd like to get remaped RS2 ish power in the future, so i get your point about the clutch, which I will possibly be upgrading, but upgrade parts for 600-700hp is quite pointless in my books.
            '93 Audi 100 Avant - R.I.P
            '92 Audi UrS4 Avant - SOLD
            '93 Audi UrS4 Avant
            '15 Audi A7 quattro 3.0 TDI

            Comment

            • diesel des
              S2Forum Possessed
              • Feb 2004
              • 3896

              #21
              If you think 380 is expensive then price a set of stock oversized pistons. Any engine rebuild deserves new bores as they will most certainly be oval and tapered at your sorta miles.

              Even a cheap and dirty build is never truly cheep. What you describe in terms of oil consumption 100% is worn bores. New rings won't fix it. On other engines i have tried honing and rings and it has never been a good long term solution. Once the bores are wore near there max tolerance it's a waste of time and good money not boring the engine.

              Just my opinion.

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              • hunker7
                S2Forum Possessed
                • Mar 2014
                • 3487
                • Home: Latvia Current: United Kingdom

                #22
                Personally I don't think you need new bores at 180 000. I will most likely be leaving pistons and rods alone (if I don't see any obvious damage or wear), probably will do new piston rings and rod bearings. Rebuild the head, and upgrade the clutch. New gaskets and sensors all round.
                '93 Audi 100 Avant - R.I.P
                '92 Audi UrS4 Avant - SOLD
                '93 Audi UrS4 Avant
                '15 Audi A7 quattro 3.0 TDI

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                • irishs2
                  S2Forum Fiend
                  • Apr 2009
                  • 2455
                  • Country: Ireland

                  #23
                  I'd believe it. At 97K my engine had zero wear on the bores, and was getting 12bar on compression test but still rebuilt as I was at it. New rings and cylinders lightly honed, mains, ACL race big ends, crank polished. The head also got rebuilt, new guides and seals etc. skim etc.

                  The main reason for the build is I found grit in the intercooler, like sand or salt crystals. It ate my turbo and I didnt want to take a chance with the rest of the engine.
                  Eric

                  95 S2 Avant under rebuild.

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                  • hunker7
                    S2Forum Possessed
                    • Mar 2014
                    • 3487
                    • Home: Latvia Current: United Kingdom

                    #24
                    Originally posted by irishs2
                    I'd believe it. At 97K my engine had zero wear on the bores, and was getting 12bar on compression test but still rebuilt as I was at it. New rings and cylinders lightly honed, mains, ACL race big ends, crank polished. The head also got rebuilt, new guides and seals etc. skim etc.

                    The main reason for the build is I found grit in the intercooler, like sand or salt crystals. It ate my turbo and I didnt want to take a chance with the rest of the engine.
                    Don't get me wrong, if I had finance to do all this, I would go mad with it. But I am a student, and I am on a budget. Want to do a light rebuild, and I am sure that will be good enough for me. If when I take it apart, can see high levels of wear etc. that's a different story, but as I said, don't think it'll be that bad after 180 000. My V6 was on 270 000 and engine was taken apart at 250000 and it didn't require new bores.
                    '93 Audi 100 Avant - R.I.P
                    '92 Audi UrS4 Avant - SOLD
                    '93 Audi UrS4 Avant
                    '15 Audi A7 quattro 3.0 TDI

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                    • igor136
                      S2Forum Addict
                      • Jun 2014
                      • 363
                      • Country: Croatia

                      #25
                      Is cylinder liner good idea? OEM old pistons? Just buy new bearings, piston rings, valve guides and all gaskets.
                      1-2-4-5-3

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                      • quattrostyle
                        S2Forum Zealot
                        • Oct 2006
                        • 6229
                        • Country: Netherlands

                        #26
                        Originally posted by hunker7
                        If when I take it apart, can see high levels of wear etc. that's a different story, but as I said, don't think it'll be that bad after 180 000. My V6 was on 270 000 and engine was taken apart at 250000 and it didn't require new bores.
                        Well unfortunately that is no guarantee, my 2.2 10V NA engines were fine even with 300.000+ km. but the three S2 engines I have opened up with less km. were all in need of oversized pistons...

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                        • andy10v
                          S2Forum Zealot
                          • Mar 2009
                          • 5996
                          • Country: Scotland

                          #27
                          I did a ghetto re fresh/rods

                          head gasket kit
                          bottom end gasket kit
                          sump gasket
                          forged rods
                          exhaust head studs/nuts
                          ARP headstuds (or use oem stretch bolts)
                          rod bearings

                          timing belt
                          billet pulley
                          water pump

                          I re used the original valve guides, just fitted new stem seals, lapped the valves in by hand, stripped/cleaned/new gaskets, cranks seals etc.

                          Did you already have fresh timing belt parts?

                          My bores still had hone marks, rod bearings looked perfect. You will not know until you open up and measure the bores.
                          Current-2004 Impreza PPP wagon

                          Sold-92 3B coupe-RS2+, 996s, konis, rear torsen, forged rods........
                          Sold ABY-stock

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                          • hunker7
                            S2Forum Possessed
                            • Mar 2014
                            • 3487
                            • Home: Latvia Current: United Kingdom

                            #28
                            Originally posted by quattrostyle
                            Well unfortunately that is no guarantee, my 2.2 10V NA engines were fine even with 300.000+ km. but the three S2 engines I have opened up with less km. were all in need of oversized pistons...
                            I think it's due to maintenance, types of oils and if service has been done regularly. Judging by the service history, mine's been in good hands, so fingers crossed.

                            I just want to buy the parts before taking the engine out, so it makes rebuilding quicker.
                            '93 Audi 100 Avant - R.I.P
                            '92 Audi UrS4 Avant - SOLD
                            '93 Audi UrS4 Avant
                            '15 Audi A7 quattro 3.0 TDI

                            Comment

                            • hunker7
                              S2Forum Possessed
                              • Mar 2014
                              • 3487
                              • Home: Latvia Current: United Kingdom

                              #29
                              Originally posted by andy10v
                              I did a ghetto re fresh/rods

                              head gasket kit
                              bottom end gasket kit
                              sump gasket
                              forged rods
                              exhaust head studs/nuts
                              ARP headstuds (or use oem stretch bolts)
                              rod bearings

                              timing belt
                              billet pulley
                              water pump

                              I re used the original valve guides, just fitted new stem seals, lapped the valves in by hand, stripped/cleaned/new gaskets, cranks seals etc.

                              Did you already have fresh timing belt parts?

                              My bores still had hone marks, rod bearings looked perfect. You will not know until you open up and measure the bores.
                              That's mostly what I want to do.

                              Timing belt on mine was done at 169 000 I think, checked it when changing crank pulley and it was good. So won't be changing that. I am still thinking about the rods, I guess it depends on how money will be when I take on the build.

                              Would stock AAN rods handle mapped RS2 power?

                              And how much does usually RS2 turbo, exhaust mani and injectors go for? (that's all I need to get RS2 spec?)
                              '93 Audi 100 Avant - R.I.P
                              '92 Audi UrS4 Avant - SOLD
                              '93 Audi UrS4 Avant
                              '15 Audi A7 quattro 3.0 TDI

                              Comment

                              • andy10v
                                S2Forum Zealot
                                • Mar 2009
                                • 5996
                                • Country: Scotland

                                #30
                                Stock rods are fine at RS2 power if there are no issues (same rods as an RS2), you can bend stock rods with an RS2 turbo if there is a problem.

                                I decided they were cheap insurance whilst the engine was in bits, and future proof.
                                Current-2004 Impreza PPP wagon

                                Sold-92 3B coupe-RS2+, 996s, konis, rear torsen, forged rods........
                                Sold ABY-stock

                                Comment

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