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Speedo threads

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Speedo threads
Parazine Offline
Advanced Fettler
*****
Joined: Aug 2017 Posts: 860 Threads: 47
Reputation: 4
Location: North Wiltshire
Car type: 1927 Chummy, 1926 Top Hat 1938 Big Seven 1/2 a Trials Chummy
#11
Yesterday, 03:00 PM
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.
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Howard Wright Offline
Grey Mag editor
*****
Joined: May 2018 Posts: 1,956 Threads: 103
Reputation: 21
Location: Llandrindod Wells
Car type: 29 Special, 30 RK, 28 C Cab
#12
Yesterday, 05:31 PM
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
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Alan Online
Legend
*****
Joined: Aug 2017 Posts: 1,285 Threads: 34
Reputation: 28
Location: Cheshire
Car type: Race Ulster, 1926 Special, 1927 Chummy, 1930 Box
#13
Yesterday, 05:38 PM
The PA is 2240tpm. Another option would be to put in a gearbox with a speedo drive. I’ve. Got plenty.
Alan Fairless
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