My Mk. 1 RS1600 race car

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  • wdavies39
    Tyre Kicker
    • May 2006
    • 21

    #16
    Re: My Mk. 1 RS1600 race car

    Tom - thanks. I've got a clearance from eligibility to race on the 15's for this season until I get new 13's over the winter. When we get them, we'll work on steering geometry as Retromotorsport said and bend a few steering arms.

    The diff is still at Grandma's in Yorkshire - somebody will be coming to England later this year, I hope, so they can bring it back. If not, we'll post it.

    By my calcs, not allowing for any loss in the system, with the 4.1 the top speed at 8500 revs will be about 139 - based on a 13 in wheel and 205mm 60% ratio I get a wheel diameter of 22.6 inches - Yoko racing tyres are 22.7 so I'm pretty close. I think 139 is probably fast enough - the Elva goes much faster but it has a basic aero design so it does clamp down to the track at high speed - you can't say that about a RS1600.

    Young Walt's (he's 25 by the way so hardly "young") video is good, isn't it. The track was really flooded so the first lap they all went crazy - you saw the spinning Ginettas. Then they all scared themselves and slowed down a bit. It then rained for 18 hours more and I went out, without camera, on the Sunday morning - I'll swear the guys at the back of the grid were in canoes!

    Walt

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    • steveo_mex
      Mechanic
      • Feb 2004
      • 545

      #17
      Re: My Mk. 1 RS1600 race car

      VERY NICE

      good to see another Mk1 hurtling round a track. keep up the good work
      Ta

      Steve

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      • glenn666
        Spanner Monkey
        • Oct 2006
        • 323

        #18
        Re: My Mk. 1 RS1600 race car

        lovely car.does it still have the original shell?

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        • mike105e
          Spanner Monkey
          • Aug 2006
          • 461

          #19
          Re: My Mk. 1 RS1600 race car

          Thats awesome mate. nice work.
          sigpic

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          • youngracer
            Tyre Kicker
            • Jan 2007
            • 48

            #20
            Re: My Mk. 1 RS1600 race car

            nice car

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            • Hoogi
              Pit Crew
              • Jul 2008
              • 1590

              #21
              Re: My Mk. 1 RS1600 race car

              Just read this one..............I do like a MKI with the Bubbles..........so much better looking than a MKII. Well that's what I think anyway

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              • rallyladgaz
                Spanner Monkey
                • Nov 2008
                • 398

                #22
                Re: My Mk. 1 RS1600 race car

                very nice bit of kit you got there

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                • SHIFTYrs2k
                  Spanner Monkey
                  • Feb 2007
                  • 444

                  #23
                  Re: My Mk. 1 RS1600 race car

                  Sounds and looks sweet mate
                  Just watched your vid...was itching to see that course car move over ....lucky with the wee slide
                  sigpic
                  S.A.S Motorsport

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                  • Med
                    Spanner Monkey
                    • Aug 2005
                    • 317

                    #24
                    Re: My Mk. 1 RS1600 race car

                    nice ride... great motor!!! sounds awesome 2...
                    sigpic

                    +-+-+-+-+- -+-+-+-+-+

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                    • MK1_Oz
                      Pit Crew
                      Decade Plus User
                      • Nov 2008
                      • 1331

                      #25
                      Re: My Mk. 1 RS1600 race car

                      Originally posted by FOSSIE
                      have you tried it on 13" wheels? Would look more "period" and (from my experience) probably handle better too...
                      fossie, why would a car handle better on 13's rather than 15's? Might be a gumbie question but I'm asking it anyway!
                      Last edited by Retromotorsport; 23-09-2009, 08:15.
                      1970 Mk1 Escort Tarmac Rally Car

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                      • Retromotorsport
                        Part of the furniture
                        Decade Plus User
                        • Mar 2004
                        • 14285

                        #26
                        Re: My Mk. 1 RS1600 race car

                        Originally posted by RS_Hopefull
                        fossie, why would a car handle better on 13's rather than 15's? Might be a gumbie question but I'm asking it anyway!
                        Take a 13" wheel, stick a tyre on it and measure the center height ... around 10"
                        Take a 15 or larger, tyre it and measure it .. the center heights now 12"

                        Thats a 2 inch difference on hub center height.

                        Now look at the parts that are fitted, Gp4 RALLY CAR equipment, designed for a car on 13" wheels and running a ride height of standard or plus 1 inch ..

                        On a road/race car you lower it 2-3 inches, we'll say 2 for now, and then add the bigger wheels and thats make a 4 inch difference to the designed hub center to chassis height, so the geometry that the Rally stuff is designed for is now out. by 4 inches ...

                        All cars should be built with the rolling radius known. or built from the wheels up, that way the supension geometry can be set for that wheel/ride height.

                        Why use larger diameter wheels.. brakes and footprint ..
                        Larger brakes can absorb and loose more heat and give more stopping power due to the larger footprint and grip.
                        You get a larger tyre footprint because of the larger rolling radius, put a pencil in your palm.. thin footprint, put a mug in your palm, big footprint ( contact patch )
                        Gary

                        Don't be mean, become green and support Turbosport - Click here

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                        • MK1_Oz
                          Pit Crew
                          Decade Plus User
                          • Nov 2008
                          • 1331

                          #27
                          Re: My Mk. 1 RS1600 race car

                          Thanks Gary - brilliant answer as always!

                          I was thinking about 15" wheels to get the big brakes in there (tarmac rally) but having read your reply I need to carefully think about their impact when purchasing other components.

                          My specs allow me to go as low as 40 profile tyres - I have not done any sums but I had in the back of my mind that the overall wheel diameter might not change that much.

                          Thanks again.
                          1970 Mk1 Escort Tarmac Rally Car

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