rallyingden
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| posted on 8/10/09 at 10:43 AM |
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Pro active
Right
Up to now I have had to react to all my problems  so for a change I am going to be pro active.......
I have a smiths mechanical speedo, origin unknown and a ford four speed type E gearbox. I'm guessing that the speedo will not be matched to the
box. I know this can be re calibrated but my questions are :-
1.... Who does it near lancashire
2.... What will they need, the speedo obvoiusly but will I need to count teeth on speedo drive, diff etc.
Anyone had to do this ?
Cheers
RD 
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Daddylonglegs
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| posted on 8/10/09 at 10:45 AM |
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I watch this with interest, as I have a VDO speedo to mate to my Type 9 5-speed box and I'm sure I'll have similar questions (except the
Lancashire bit, 'cos I'm in Wiltshire ).....
It looks like the Midget is winning at the moment......
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blakep82
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| posted on 8/10/09 at 10:53 AM |
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theyd need to know about the gearbox speedo drive, diff, and tyre size i'd imagine. best place to send it is probably going to be caerbont
instruments since they make them. www.caigauge.com i think
maybe wait til the cars all finished, try it, see how far out it is, then tell them the shown speed and actual speed, and they could probably sort it
that way too
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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matt_claydon
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| posted on 8/10/09 at 10:54 AM |
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You will need to know:
The circumference of the tyre (mark tyre and ground, roll forward one revolution, mark ground again, measure length). You can also look up typical
values based on tyre size - bear in mind tyre wear affects this.
Number of turns of speedo cable for 1 turn of the wheels (both wheels need to be turned the same, you can do this by rolling the car). Best to do 10
turns of the wheel for better accuracy and stick a cardboard pointer on the end of the speedo cable.
If the gearbox isn't in the car then do the same for turns of the gearbox output shaft but you will need to tell the calibrator your diff ratio
as well.
[Edited on 8/10/09 by matt_claydon]
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iank
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| posted on 8/10/09 at 10:56 AM |
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Speedy cables calibrates them, their webpage tells you what they need to know.
http://www.speedycables.com/calibration.html
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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