Jim, et Listers,
Based on a 7 tooth drive gear, the correct speedo gear for a 980 calib
factor speedo would be 18 teeth (0.3% error), and for your 1020 speedo it's
17 teeth (2% error). Where did the 22 tooth gear come from? Not original I
presume. Perhaps you changed it to compensate for smaller diameter tires?
Bob
At 07:26 PM 3/26/99 -0500, James Barrett wrote:
>>Date: Fri, 26 Mar 1999 18:16:32 -0500
>>To: laifman@flash.net
>>From: James Barrett <jamesbrt@mindspring.com>
>>Subject: Re: Gear Ratios Speedometer gear eyeballed
>>
>>At 03:02 PM 3/26/99 -0800, you wrote:
>>>Jim,
>>>
>>>While your in there counting teeth on Top Loaders, would you
>>>have a look at that helical speedo drive gear and tell us
>>>whether it is directly on the output shaft, or gear driven
>>>from it. Can you tell how many teeth? Do you see a
>>>difference between the close and wide ratio, or know if
>>>there is a difference between the Tiger versions and the
>>>other Ford runs?
>>>
>>>I am not even that certain of the material of the gear,
>>>although I believe it is steel against the nylon speedo
>>>cable gear.
>>>
>>>Steve
>> Just counted the teeth. On the HEH CF ( the wide
>>ratio Tiger II transmission) there are 7 teeth . The
>>gear appears to be a white plastic. It is directly
>>on the output shaft.
>> Previously I did note that the teeth of the HEH CF driven
>>gear are much courser than the SROD driven gear. The SROD
>>driven gear had 22 teeth an the HEH CF had (15 to 17? can't find
>>it at the moment). I assume that with finer teeth the SROD
>>drive gear has more than 7 teeth on it.
>>
>>
>>
>James Barrett Tiger II 351C and others
>
>
Robert L. Palmer
Dept. of AMES, Univ. of Calif., San Diego
rpalmer@ames.ucsd.edu
rpalmer@cts.com
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