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Re: [Spridgets] Speedo Repair

To: "Timothy H. Collins" <thcollin@mtu.edu>, spridgets
Subject: Re: [Spridgets] Speedo Repair
From: <uniquelittlecars@yahoo.com>
Date: Thu, 21 Feb 2008 14:58:47 -0800 (PST)
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@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@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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