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Re: [Tigers] Speed Driven Gear Questions have...

To: Larry Mayfield <drmayf@mayfco.com>
Subject: Re: [Tigers] Speed Driven Gear Questions have...
From: "e.coiner--- via Tigers" <tigers@autox.team.net>
Date: Tue, 6 Dec 2016 14:42:35 -0800
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You misunderstood.
The speedo takes 980 revolutions of the speedo cable to indicate one mile on 
the odometer.
Not 980 revs of the tire for a mile.  
---- Larry Mayfield <drmayf@mayfco.com> wrote: 
> Hello, Thanks for the info and reply! 
> I went to David Kee top loader pages and found this:
> A black drive gear with 7 teeth pn C4DZ-17285A  NOT for Tiger
> A  pink gear with 6 Teeth pn C5ZZ-17285A  NOT for tiger
> A Yellow gear with  7 Teeth  pn DK296-YSG  FOR Tiger
> A Brown gear with 8 teeth  pn DK286-BSG FOT Tiger
> There are no 6T drive gears for the top loader, at least available anyway.  
> With the plethora of driven gears and a pair of drive gears and knowing the 
> dire diameter for the revolutions per mile calculation then one should be 
> able to come pretty dang close to reality I think.  That 8=980 revs per  mile 
> is a high number due to the dinky OEM tire size sold with the cars. I think 
> the overall diameter of the Dunlop 5.90 tires was 20.5 inches which would be 
> about right for the 980 res per mile. Tires today are larger and a 205 x 15 
> is 23 inches or so in diameter and that results in a lower of revs per mile 
> to run the speedo. So, the drive and driven gears need to be selected  to get 
> that tire back to a pseudo 980 revs per mile.  And the rear gear needs to be 
> added in as well if it has been changed. Not a terrifically involved process 
> but stuff has to be accounted for in order to get a good reading speedo. 
> Final fiddling can be achieved internally to the speedo although I have never 
> ever tried that. 
> Or purchase a GPS unit, lol. Plug and play....  add power, turn on....
> mayf
> -----Original Message-----
> From: e.coiner@cox.net [mailto:e.coiner@cox.net] 
> Sent: Tuesday, December 6, 2016 6:09 AM
> To: Larry Mayfield <drmayf@mayfco.com>
> Cc: Larry Mayfield via Tigers <tigers@autox.team.net>
> Subject: Re: [Tigers] Speed Driven Gear Questions have...
> I believe the Tiger is 6 teeth. 7 is the other common size.
> Other useful info is the Tiger speedo takes 980 revolutions to rack up 1 mile 
> on the odometer. Its printed on the face of the speedo in a really small font.
> ---- Larry Mayfield via Tigers <tigers@autox.team.net> wrote: 
> > 
> > 
> > sparked one from me. What is the number of teeth on the drive gear itself?
> > The one that is on the actual output shaft of the transmission?  I 
> > suspect there can be a couple of them that could be used.  With that 
> > gear count and the driven gears available it becomes fairly easy to 
> > determine which speedo cable driven gear is best for the car 
> > parameters, like tire size, final drive rations etc.
> > 
> > mayf
> > 
> >  
> > 
> > _________________________
> > drmayf
> > Worlds Fastest Sunbeam, period.
> > 204.913 mph flying mile
> > 210.779 mph exit (not top)  speed
> > 
> >  
> > 



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