The following warnings occurred:
Warning [2] Undefined variable $search_thread - Line: 60 - File: showthread.php(1617) : eval()'d code PHP 8.1.31 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/showthread.php(1617) : eval()'d code 60 errorHandler->error_callback
/showthread.php 1617 eval



Austinsevenfriends › Austin Seven Friends Forum › Forum chat... v
Speedo threads

Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Threaded Mode
Speedo threads
Parazine Offline
Advanced Fettler
*****
Joined: Aug 2017 Posts: 882 Threads: 48
Reputation: 4
Location: North Wiltshire
Car type: 1927 Chummy, 1938 Big Seven 1/2 a Trials Chummy
#11
01-07-2024, 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.
Reply
Howard Wright Online
Grey Mag editor
*****
Joined: May 2018 Posts: 2,108 Threads: 110
Reputation: 22
Location: Llandrindod Wells
Car type: 29 Special, 30 RK, 28 C Cab
#12
01-07-2024, 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
Reply
Alan Offline
Legend
*****
Joined: Aug 2017 Posts: 1,337 Threads: 34
Reputation: 30
Location: Cheshire
Car type: Race Ulster, 1926 Special, 1927 Chummy, 1930 Box
#13
01-07-2024, 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
Reply


Forum Jump:


Users browsing this thread: 2 Guest(s)