RS2 vs S2 cambelt

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  • audiman
    S2Forum Freak
    • Jul 2003
    • 4827
    • Country: United Kingdom

    #1

    RS2 vs S2 cambelt

    I seem to remember a discussion ages ago (maybe on old forum) about the differences between the rs2 and s2 belt. From memory, you have to use rs2 belt if you are using rs2 water pump. IF you use S2 belt with rs2 water pump, doesnt the timing go out after a while???

    Had a quick search but couldnt find anything about it.

    Im sure someone here will able to tell me.
    sigpic
    Tom C - www.rcmr.co.uk
    Audi UR Quattro
    Audi 100 C3 2.0 5 cyl 115ps
    Audi S2 - 07k engine project aiming for 800ps
    Audi B5 RS4 645ps 911nm
  • Rusty
    Super Moderator
    • Jun 2004
    • 18953
    • Country: United Kingdom

    #2
    RS2 water pump has a few less teeth on it so is smaller diameter. I assume (as I never checked when I fitted it) that the RS2 item is shorter to take up the difference between S2 and RS2 WP pulleys and so allow correct use of the tensioner. I don't see why the timing would alter at all unless the tensioner was on the limit and so it slipped. This would be fairly
    Cheers'en, AndyC
    1994 ABY Coupe - Projekt Alpinweiss

    Comment

    • audiman
      S2Forum Freak
      • Jul 2003
      • 4827
      • Country: United Kingdom

      #3
      i have a feeling one of the belts is different by 1 tooth, but cant remember which way round it is? and i cant see why 1 tooth would make that much difference on the tensioner??

      i might be wrong, thats why im asking
      sigpic
      Tom C - www.rcmr.co.uk
      Audi UR Quattro
      Audi 100 C3 2.0 5 cyl 115ps
      Audi S2 - 07k engine project aiming for 800ps
      Audi B5 RS4 645ps 911nm

      Comment

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

        #4
        Yeah, RS2 would be shorter. 1 Tooth could make a fair bit of difference, Audi wouldn't have made our lives more complicated for no reason now would they...
        Cheers'en, AndyC
        1994 ABY Coupe - Projekt Alpinweiss

        Comment

        • Audi_CQ
          S2Forum Maniac
          • Mar 2004
          • 940
          • Country: Norway

          #5
          RS2(ADU) = 150 teeth
          S2/S4(ABY/AAN) = 151
          3B / 7A = 147

          Comment

          • Bram
            S2Forum Fiend
            • Aug 2006
            • 2582
            • Country: Netherlands

            #6
            correct. 1 tooth difference. The timing wil stay the same when you use a different timing belt as the individual tooth distances remains the same. When one tooth passes the crank pulley it will also turns the camwheel by 1 tooth.

            Comment

            • Audi_CQ
              S2Forum Maniac
              • Mar 2004
              • 940
              • Country: Norway

              #7
              BTW: the RS2 belt fits perfect when building a tall block 2.5 with 3B type adjustable waterpump.

              Comment

              • MidnightBlueS2
                S2Forum Extremist
                • Jul 2005
                • 1653
                • Home: United States Current: Belgium

                #8
                Originally posted by Andy_Casey
                RS2 water pump has a few less teeth on it so is smaller diameter. I assume (as I never checked when I fitted it) that the RS2 item is shorter to take up the difference between S2 and RS2 WP pulleys and so allow correct use of the tensioner. I don't see why the timing would alter at all unless the tensioner was on the limit and so it slipped. This would be fairly

                Midnight Blue S2 - SOLD - 1993 S2 Avant

                Comment

                • AndyP
                  S2Forum Zealot
                  • Feb 2004
                  • 6049
                  • Country: England

                  #9
                  Originally posted by Audi_CQ
                  BTW: the RS2 belt fits perfect when building a tall block 2.5 with 3B type adjustable waterpump.
                  Cool, thanks for that
                  sigpic
                  1991 Audi S2 3B - 2.5 Stroker engine
                  1997 A6 2.5TDi quattro avant - C4
                  1976 RD250E / 350LC cafe racer

                  Comment

                  • Billman
                    S2Forum Freak
                    • Nov 2004
                    • 4129

                    #10
                    How is this WP adjustable? Does the 3B has a tensioner?
                    Go Holset or Go RS4

                    Comment

                    • Jamo
                      Retired OG Mod
                      • Mar 2004
                      • 21750
                      • Country: United Kingdom

                      #11
                      The waterpump is the tensioner on a 3B engine.

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