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+--- Thread: Speedo threads (/showthread.php?tid=9443)
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Speedo threads - Alan - 28-06-2024
Does anyone know the thread size on input to a PA type governor speedo? Thanks.
RE: Speedo threads - Austin in the Shed - 28-06-2024
3/4”x26.
RE: Speedo threads - Alan - 28-06-2024
Thanks Dave
RE: Speedo threads - JonE - 28-06-2024
Are you also trying to find a die after a mazac failure repair, Alan?!
RE: Speedo threads - Alan - 28-06-2024
No, I’m thinking about a reduction gearbox to correct speedo inaccuracy
RE: Speedo threads - Dave Mann - 29-06-2024
You could fit a bicycle speedo which is probably easier and cheaper to fit, I fitted them to our cars and found that two PA speedos read correctly and one 3 mph fast.
RE: Speedo threads - Alan - 29-06-2024
I’ve got a bike speedo on the RL but I want the original speedo on the chummy to read correctly. It’s a belt drive that provides 3360 turns per mile into a 2240 instrument.
RE: Speedo threads - Dave Mann - 30-06-2024
If the chummy has it's original speedo why is the belt drive incompatible?
RE: Speedo threads - Alan - 30-06-2024
I used original in the sense that I wanted the speedo that’s fitted to read correctly not to replace it with a bike speedo. The problem is it’s a belt driven system- that outputs 3360 turns per mile. The rather nice speedo head I have takes 2240tpm so it over reads somewhat. Options as I see it are new pulleys, a corrector box or just get better at mental arithmetic.
RE: Speedo threads - Ivor Hawkins - 30-06-2024
My speedo works but it it so inaccurate I ignore it anyway. Top speed so far downhill with the win£ behind me is 57 mph.