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Nominal

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    Tech Spam thread - because 1/4" BSP gets 5 hand spans to the jiggawatt

    in Tech Talk

    Posted

    4 hours ago, VitesseEFI said:

    Doesn’t mean the face (with the Tpm marking) left the factory with the same mech it has now…..

    Vitesse has a misleading number on the face (which is original) as the workings are from a Dolly 1850 to match the previous gearbox and diff.  As it turns out, the speedo gearing was absolutely identical on the Toyota W58 - which was unusually serendipitous!

    The gods clearly remembered though as the MX5 box speedo gearing is VERY different from GT6 (reads 40% low), so I really ought to do something about that….

    It's possible I suppose that it was modded when NZ changed from mph to kph limits on the road in the 76/77 or so. 

    In the old Holden there were a couple of stickers on the speedo to mark the main limits, but those have worn off now.

    We are only the second owners of the Morrie and it's pretty original.

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    Nominal's Wooden (Wood knot) Car

    in Projects and Build Ups

    Posted

    Morris is still here so I'm doing a few little fix-ups before trying to sell it again.

    WOF man mentioned the speedo accuracy last time (it's been awful for many years) and since it's due for a WOF again I thought I better get it sorted.

    So distinguished!

    image.thumb.jpeg.99ade49bd50a1390d66b3251b9a987e4.jpeg

    The mechanic recommended Auto Instrument Services in New Plymouth so I gave them a call.

    The instructions were to pull the gauge and tape a 'flag' onto the cable drive, then count the turns over a measured 50m distance.

    So it came out without too much bother.

    image.thumb.jpeg.89395650ace6347b2eb22f90a8ae1246.jpeg

     

    Worked out as 44 turns for 50m, so 1416 per mile, speedo spec is 1376 turns per mile.

    It's way less accurate in practice though, about 45% out.

    So I packed it up and sent it out

    image.thumb.jpeg.030175e071ecb62504b7fab4a28b21dd.jpeg

    • Like 12

    Tech Spam thread - because 1/4" BSP gets 5 hand spans to the jiggawatt

    in Tech Talk

    Posted

    7 hours ago, RUNAMUCK said:

    Place in christchurch had a machine that would count the turns while the the vehicle was driven a mile/km.

    Marked  out 50m on the road and counted 44 turns of the cable which works out to 1416  turns per mile, speedo is marked as 1376 tpm so pretty close, it should read about 3% fast, probably due to radial vs crossply.

    Actually reads about 45% fast so will send it off for a lookey-loo

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