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johny

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johny last won the day on April 27 2020

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About johny

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  1. Hi, can I ask what are you trying to power and what makes you think the dynamo isnt up to it?
  2. I think you'll be lucky to see much difference unless the cars on a rolling road and really doing some work so the butterflies are well open...
  3. Think Iain wants weaker on constant running and richer on acceleration so need to work out which is the standard spring and find a weaker one?
  4. yes its interesting. I wonder if you can estimate the length of the spring when its installed and then take it out to put weights on it. When its compressed to the same length thats the equivalent weight youd have to start with on the piston when driving without a spring....
  5. yes a bit complicated as it needs to be matched to the right needle profile as well. The weight of the piston should have the same effect as the spring so it might be possible to remove your spring and try different weights to adjust the mixture...
  6. to make the mixture richer on acceleration you could try a thicker oil...
  7. I think the spring strength determines the piston position for a given vacuum and the oil thickness changes how quickly the piston gets there...
  8. Sorry, yes that sounds more like it...
  9. Cliff, I would seriously recommend downloading a free manual from that site as this information is common to many cars and would help you learn a lot.....
  10. I know youve set the mixture with the pins but its not an exact science so you could richening the mixture a half turn to see if that improves the hot starts. Also have you got recent cylinder compression readings?
  11. I think you need to identify the diff either by cleaning off the painted serial number or if that isnt possible by counting the actual wheel turns. To do the latter, with the car raised, you have to accurately mark the position of both wheels and diff input flange then lock one of the wheels solidly. An assistant has to turn the free wheel exactly two revolutions while you count the turns of the input flange and mark where it ends up. Your flange will have rotated 3 times plus some which you have to work out is 0.27, 0.63 or 0.89 of a turn...
  12. I think we've agreed on here that the variation for diff ratios isnt corrected in the gearbox but in the actual speedo. The correct one for yours should show 1000 (revs/mile) on the face...
  13. Not sure as perhaps where the washer and circlip sit is the same size in all MC and also the pushrod is universal so that just the bore/piston size varies. That seems logical and then one pushrod can be used for all... It would be interesting to see if anything is already in place on the new MC? Although I dont think a workshop manual specific to the 1500 Spitfire is available you might find some of the others available free from vitessesteve.co.uk useful...
  14. Sorry I think we might have misled you a bit as looking in the Vitesse online workshop manual the MC has an internal circlip that retains a washer which allows the pushrod to move but not come out. When the pedal is released the internal spring traps the pushrod between the piston and washer/circlip so it cant move. You might be able to rotate it with your fingers but there shouldnt be any back and forward play. The only possible play will be between the clevis and brake pedal which of course then does indicate that the MC isnt under pressure and all is correct. I think if the clevis
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