[Spridgets] Speedo Repair

uniquelittlecars at yahoo.com uniquelittlecars at yahoo.com
Thu Feb 21 15:58:47 MST 2008


Tim,
   
  Thank You for the copy.
   
  Strange comment on the data  - Now i am really confused - What is the correct aspect ratio?  Why the big difference? Anyone?
   
  "I can not explain the rather significant deviation of the calculated speedometer calibration from the speedometers that were used in the cars. If I use their Rolling Radius, the 165 radials and bias tires would have aspect ratios of 77 and 74 respectively. Under that circumstance the calculated calibration is even further away from the supplied speedometers. If I work backward from the stock speedometers, I get an aspect ratio of 90 and 85 respectively!"
   
  165/83-15 (RADIAL) 807 1:3.7 2985 2.5:1 1194 (1152) 3.6%
  165/78-15 (BIAS)     819 1:3.7 3031 2.5:1 1212 (1184) 3.5%
   
  
Vigil
   
  
"Timothy H. Collins" <thcollin at mtu.edu> wrote:
  Virgil,
Here's a copy.
Tim

At 10:20 PM 2/20/2008, you wrote:
  i would like a copy -----
 
thanks,
 
Vigil

"Timothy H. Collins" <thcollin at mtu.edu> wrote:
    
   Somewhere along the way I snagged a .PDF file titled; "Repairing 
  
   Jaeger & Smiths Speedometers" by Anthony Rhodes. It discusses the 
  
   ratio numbers (turns per mile) issue in the appendix and may be of 
  
   help. It's well written and includes pictures. Search for the doc by 
  
   the title and author or contact me for a copy.

  
   Tim Collins
  
   http://www.flickr.com/photos/12702006@N07/ 
  
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http://www.flickr.com/photos/12702006@N07/ 


       
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