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Policar Ferrari 312B modifications

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  • Policar Ferrari 312B modifications

    I built this for someone whose club has fairly loose rules,..so,....they may or not be usable in your particular club, but, if you can use them, they do help the car considerably

    Cheers

    Chris Walker


    The chassis was straightened, edges sanded for body clearance, silicone washers used between the pod mount/front chassis plate, weight added, rear wheels replaced with the Policar aluminum ones, new trued tyres, the transmission bushings aligned, with "thrust washers" installed, lead wires re routed, and front axle bushings installed to minimize fore aft movement of the axle etc. etc.


    The completed chassis......................





    The lead wires fouled on the front axle, causing excess front axle friction, and they affected the front axle vertical height..............so,.....a couple of small dia. pieces of styrene tubing were glued to the chassis plate just under the front axle, with the leads routed through.....both problems solved !!

    I initially used a reduced dia. axle, and while this helped, it did not fully resolve the issue.......the styrene tubes eliminated the need for this axle,..but, I left in in.

    You can see the styrene bits of tubing (white), under the front axle. I did use some lead wire with a thinner coating, as they are more flexible , but, the stock ones work just fine.

    You can also see the silicone washers between the pod lug and the front chassis plate....these quiet things down , but, offer a more controlled and progressive torsional flex.






    While vertical travel of the front axle is easily and effectively controlled via the top/bottom grub screws......on mine, there was a fair amount of for/aft movement of the axle which create a bit of "steering" at the front end. This oscillation or "steering" of the front axle is not great on the straights....as it cause some wandering which results in excess friction on the sides of the slot, and in corners, it leads to erratic handling.

    A few of the commercial track car manufacturers produce some very thin wall axle bushings (3/32 id.) and when I tried them they fit the openings of the front axle uprights on the Ferrari.

    The particular bushings I used are from MRSlotcar, but, a few different manufacturers produce them.

    A couple of quick strokes with a round file, and the bushing slipped right in......just loose enough to move vertically, to allow for front end axle vertical adjustments for different track, but snug enough to mostly eliminate for /aft axle movement.

    Here is the stock front upright...lots of room for axle movement.





    The reduced diameter axle bushings on the left.......typical 3/16 x 3/32 oilites on the right.





    And popped into the front uprights.....not glued !!






    While the gearbox/transmission is a delight, it can be improved, particularly with some thin (.005 thou) washers between any fixed and rotating surface...if two washers are used they will slip against each other instead of the rotating surface grinding against the fixed (stationary one),.....this reduces friction, improves precision, and greatly reduces wear.

    Not the easiest to see, but, I have used 2 thin washers between all fixed/rotating surfaces.....you can just make the out between the"stopper" and the axle bushing, and between the final drive spur and the bushing.





    While not performance related , I did do some cosmetic stuff........I could not stand looking at Jacky's eyeballs, so I put some clear smoke paint on his visor, took apart the exhausts, and re glued/painted them, a bit of flat/matt varnish on Jacky's suit, a bit of molotow chrome on the susp. bits, and as there were some little holes already in the valve covers, spark plug leads were added.

    The wheels were fully painted gold...(they did not have chrome edges) , and front tyres from the Slot-it Alfa T33 were glued/trued/profiled.....these just look a tad more realistic to me.




    Plug leads........and a bit semi gloss on the valve covers

    I am a bit annoyed at the factory bleed through the roundels, but it is a minor complaint........and really a bonus not to see Jacky's goofy eyeballs anymore.



    And a bit of paint on the engine..........

    Last edited by chrisguyw; January 2, 2021, 05:21 PM.

  • #2
    Nice work Chris as usual the attention to detail excellent
    But if this car goes into the wall what happens, does he have to send it back for a tuneup

    Comment


    • #3
      Originally posted by 4424ever View Post
      Nice work Chris as usual the attention to detail excellent
      But if this car goes into the wall what happens, does he have to send it back for a tuneup
      If you make these mods., the car just will not crash !!

      Cheers
      Chris Walker

      Comment


      • Brumos RSR
        Brumos RSR commented
        Editing a comment
        With a no crash guarantee!!! Great work Sir ChrisGuyW
        Last edited by Brumos RSR; January 2, 2021, 11:36 PM.

      • ZackM
        ZackM commented
        Editing a comment
        Note he said the car, but makes no mention of the driver!

        Zack

    • #4
      Very nice. Lots of good info here and a few tweaks that wouldn't have occurred to me. Thanks!

      Comment


      • #5
        Hi Chris thanks for the post.
        Could you give me a part number or alternative options for the 'bushings from MRSlotcar, but, a few different manufacturers produce them'

        thanks
        David

        Dangermouse to the rescue.

        Comment


        • #6
          Originally posted by GT40 Racer (DM) View Post
          Hi Chris thanks for the post.
          Could you give me a part number or alternative options for the 'bushings from MRSlotcar, but, a few different manufacturers produce them'

          thanks
          David
          Hi David, As well as MRSlotcar, .......Slick7, Kelley, and JK all make reduced wall thickness bushings for 3/32 axles that will likely do the job. I do not have part numbers handy but if you call your local (or not so local ) commercial track, they will (or should ) know what you are looking for.

          If you get stuck, let me know.

          Cheers
          Chris Walker

          Comment


          • #7
            These Slick 7 works for me.

            Click image for larger version

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            "I don't make mistakes. I make prophecies which immediately turn out to be wrong "
            "And that just shows you how important the car is in Formula One Racing"

            Murray Walker

            Comment


            • #8
              Originally posted by F1Fan View Post
              These Slick 7 works for me.

              Click image for larger version  Name:	PXL_20210103_215618887.jpg Views:	13 Size:	1.65 MB ID:	72969


              I am sure they do Chris, but they are still a 3/16 x 3/32 bushing,......not the reduced diameter bushings from Slick7. Kelley, MRSlotcar, as posted above.

              The reduced wall thickness ones are on the left, the standard 3/16 wall thickness on the right........your pictured Slick7 bushings are still 3/16 wall thickness. but, with a chamfered edge......you would need to take a significant amount of material off of the front uprights of the Policar 312B2, to fit these, to the point where the integrity/strength of the upright would be compromised

              Cheers
              Chris Walker

              Click image for larger version

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              Attached Files
              Last edited by chrisguyw; January 3, 2021, 05:29 PM.

              Comment


              • #9
                I love neat lead-work

                I shape my lead with a small grinding vice and pair of parallels to make sure the pieces are dead flat and parallel before Shoe-Goo'ing in.
                Print It, Build It, Race It, Improve It, Repeat...

                Comment


                • #10
                  I went back to check what I used, the OD for these bushings are 4mm, the S7 I showed above are 4.75.

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                  "I don't make mistakes. I make prophecies which immediately turn out to be wrong "
                  "And that just shows you how important the car is in Formula One Racing"

                  Murray Walker

                  Comment


                  • #11
                    The tip about making wire keepers to prevent motor wires from fouling on the front axle is great. We do it all the time on scratchbuilt brass chassis, but I never thought about it for a plastic chassis. I was having this trouble with an NSR based build and this took care of it. Gave myself a dope slap for not figuring out on my own. Thanks again, Chris.

                    Comment


                    • #12
                      Originally posted by Mickey thumbs View Post
                      The tip about making wire keepers to prevent motor wires from fouling on the front axle is great. Gave myself a dope slap for not figuring out on my own. Thanks again, Chris.

                      Like this ??


                      Cheers , and, a Happy New Year

                      Chris Walker
                      Last edited by chrisguyw; January 4, 2021, 11:47 PM.

                      Comment


                      • #13
                        Wow, great build you've fixed most the Policar problems right here! Agreed on the goofy eyeballs and the bleed through on the roundels.

                        Comment


                        • #14
                          Thanks Chris. Highly detailed and informative as usual. Source for these silicone washers you use on many of your builds?

                          Cheers

                          Comment


                          • #15
                            Looks like possibly RC car red silicone shock absorber o-rings, but what manufacturer, part number and/or size?

                            Comment


                            • chrisguyw
                              chrisguyw commented
                              Editing a comment
                              These have been specifically designed/produced (size and shore) for use with current "plastic" based slot cars.........see next post(s) for details
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