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+--- Thread: Smiths mechanical govenor speedometers (/showthread.php?tid=2299)
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Smiths mechanical govenor speedometers - Austin in the Shed - 27-01-2019
I know information is rather scarce on these but does anyone know if they made a PN 100 mph version ?
This is the one with the 45 degree drive as fitted to Ulsters,earlier Chummies etc
The reason I ask is I have just bought one but suspect it might just be a clapped 60 fitted with a new 100 face.
Any advise please
RE: Smiths mechanical govenor speedometers - Alan - 27-01-2019
As a supplementary question, is it possible to recalibrate these. I have a good PA @ 2240 turns per mile, which I’d much rather worked at 3360.
RE: Smiths mechanical govenor speedometers - Austin in the Shed - 27-01-2019
Is that for a belt driven speedo drive,I think they are an A and not too uncommon.
RE: Smiths mechanical govenor speedometers - Alan - 27-01-2019
Yes it is.
RE: Smiths mechanical govenor speedometers - Mark McKibbin - 28-01-2019
(27-01-2019, 11:00 PM)Alan Wrote: As a supplementary question, is it possible to recalibrate these. I have a good PA @ 2240 turns per mile, which I’d much rather worked at 3360.
I think a TN is pretty close to that, they seems to come up regularly.
RE: Smiths mechanical govenor speedometers - "Slack Alice" Simon - 28-01-2019
The standard reply to the question of changing the range of a governor speedo is "make a gearbox".
Which, I am sure, is the best solution.
On mine, I changed the spring that the weights move against, trying different springs made from whatever wire I had around.
It has worked, reasonably well, for a long time.
Simon
RE: Smiths mechanical govenor speedometers - Alan - 28-01-2019
Thanks, Simon, but I really need the mileage to be correct as well. Speedograph Richfield will sell me a correction box for about £100. That will do the job but I’d rather have the speedo recalibrated if it’s possible. I suspect the economics might rule it out though.
RE: Smiths mechanical govenor speedometers - Austin in the Shed - 28-01-2019
How about changing the pulley sizes instead
RE: Smiths mechanical govenor speedometers - Charles P - 28-01-2019
Dave/Alan
Have you seen this?
http://www.magnetic-speedometer-repair.com/gov-howSpeedometerWorks.php
It would seem that much is possible, if you're brave.
Charles
RE: Smiths mechanical govenor speedometers - Austin in the Shed - 28-01-2019
I spoke to him a year or more ago.He would only recondition not recalibrate.A recon was I believe about £250.