Section : Dashboard and Instruments

Speedo Calibration

Posted By : John Ticehurst, 06-Apr-2007, 04:17pm

I have just taken delivery of a replacement speedo from my 66 Spitfire Mk2 and notice it goes up to 120 MPH instead of 110MPH of the old (broken) one. Does anybody know whether any Mk2's did go up to 120mph - maybe I have been sent one for a mk3 instead. Also I am unsure whether I will experience calibration problems if it is for the wrong mark. Can anyone help please?

Followups :

Speedo Calibration

Posted By : Peter & Mick Lewis, 06-Apr-2007, 06:31pm

look at the small printed numbers on the face down by the oddometer something in the 1000 region its the number of turns of the cable per mile, if both speedo's have similar then alls ok,,, there are many different ones to cope with tyre size,gearbox drive worm and pinion , diff ratio etc. peter
- Speedo Calibration
  
  Posted By : John Ticehurst, 06-Apr-2007, 10:21pm
  
  Just been out to the garage to check. They both show the same number, so all is well. Thanks for your advice Peter.
  - Speedo Calibration
    
    Posted By : Peter & Mick Lewis, 07-Apr-2007, 09:59pm
    
    Nice to know when things on this message board give a solution ,,,happy motoring peter
    - Speedo Calibration
      
      Posted By : Stephen Weblin, 08-Apr-2007, 02:39pm
      
      The number will indicate the factory setting. If the speedo has been refurbished at some point in the past it may have been recalibrated as well.
      
      I had the speedo in my Vitesse recalibrated to allow for the 3.63 diff, 5.5 rims and 70 section tyres but the number on the instrument fascia stayed the same.
      
      Check this out http://www.mintylamb.co.uk/gearspeed/ for details of how changes to wheels and tyres etc effects the speedo.