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Austinsevenfriends
Speedo threads - Printable Version

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RE: Speedo threads - Parazine - 01-07-2024

I had the opposite problem, a 3360 instrument, driven from the gearbox at 2240 tpm. I rebuilt the speedo with a 2240 tpm governor from another instrument and it now reads accurately.

RE: Speedo threads - Howard Wright - 01-07-2024

Hi All

I think the PA speedo was used in the Chummy (4.99 ratio axle) and also the RN (5.125 ratio axle). The speedo in my Special was way out until I fitted the later axle but now it is surprisingly accurate. I’m not sure of the numbers but they probably correspond to Parazine’s post.

Cheers

Howard

RE: Speedo threads - Alan - 01-07-2024

The PA is 2240tpm. Another option would be to put in a gearbox with a speedo drive. I’ve. Got plenty.