[Tigers] speedo nylon gear

Fri Dec 2 17:55:10 MST 2016

I use my GPS as it shows my actual speed- more so than for where I am going- as out of my mind is a short trip! Tony Lang (TtT)

      From: Ron Fraser via Tigers <tigers at autox.team.net>
 To: 'Jerry Mo Christopherson' <JCMC2006 at suddenlink.net>; tigers at Autox.Team.Net 
 Sent: Friday, December 2, 2016 4:40 PM
 Subject: Re: [Tigers] speedo nylon gear

Jerry                The 16T gear works very well with today’s radial tires which are not as tall as the original bias ply tire.  Yes you can work back from the tires, gears combo you have to see what is needed.  Your tire circumference – ft in a mile – tire revs / mile – rear axle gears – engine revs/ mileEngine revs/ mile – trans gear to speedo cable gear – revs/ mile at speedo.  Ron Fraser  From: Jerry Mo Christopherson [mailto:JCMC2006 at suddenlink.net] 
Sent: Friday, December 02, 2016 5:13 PM
To: 'Ron Fraser' <rfraser at bluefrog.com>
Subject: RE: [Tigers] speedo nylon gear  Ya, I was just thinking one could work it backwards, i.e. I have this wheel/tire combo and this rear end ratio so what combination of “gears” would I need to get close to something that was as “accurate” as the original.  To me the speedometer is just something relative anyway.  If we are all having to live with a 16 tooth gear any way we just accept that it’s wrong.  Jerry  From: Ron Fraser [mailto:rfraser at bluefrog.com] 
Sent: Friday, December 02, 2016 3:01 PM
To: 'Jerry Mo Christopherson'; CoolVT at aol.com; Rollright at aol.com; tigers at autox.team.net
Subject: RE: [Tigers] speedo nylon gear  Jerry                I think you’re looking at this the wrong way.  The different gears and ratios are designed to make the tire sizes of the day work fairly accurately with the speedometer.  Original 15T to 6T and a 980 revs/ mile speedo needs a tire with a circumference around 75”Has anyone ever measured the circumference of an Original Tiger Tire to verify this calculation?  A 16T to 6T with 980 speedo needs a tire C around 70.5”  These are just a mechanical calculation from the speedo to the tire circumference with all the original gear ratios.  Sunbeam had other speedos available – 1000 and 1020 revs/ mile and different axle ratios; any of these will change the accuracy of the speedo and thus require a different cable gear.  It’s probably easier to convert to a GPS speedometer then play with all these gear ratios if you’re looking for a totally accurate speedo.  Ron Fraser  From: Jerry Mo Christopherson [mailto:JCMC2006 at suddenlink.net] 
Sent: Friday, December 02, 2016 1:31 PM
To: CoolVT at aol.com; rfraser at bluefrog.com; Rollright at aol.com
Subject: RE: [Tigers] speedo nylon gear  This video is very informative, which leads me to this question.  Not knowing the number of the drive gear on the Tiger trans, is it possible to get a different drive gear to better match the original ratio using the only driven gear that is now available (i.e. 16t)??  Just wondering.  Jerry Christopherson9473187TAC insp. #58  From: Tigers [mailto:tigers-bounces at autox.team.net] On Behalf Of CoolVT--- via Tigers
Sent: Thursday, December 01, 2016 2:47 PM
To: rfraser at bluefrog.com; Rollright at aol.com; tigers at Autox.Team.Net
Subject: Re: [Tigers] speedo nylon gear  This tutorial on speedo gears is taken from a Mustang site (sorry I can't give the proper credit).  It's for Mustangs, but much is the same on a Tiger.Mark L https://www.youtube.com/watch?v=WDQyhhPNyKc&feature=youtu.be    In a message dated 12/1/2016 2:14:14 P.M. Eastern Standard Time, tigers at autox.team.net writes:
Jim                The original Mk I speedometer cable gear is C3OA-17271-A  15 teethMark on the gear is 15R – pictures are an original 15R gear – very worn.16R is what is available now  The different colors are for different teeth count; makes them easy to ID.Took me years at work to convince R&D design teams to change the color of gears when different gear sets were being evaluated.   I hated getting 5 bags of black gears that I then had to count the teeth.  Ron Fraser  From: Tigers [mailto:tigers-bounces at autox.team.net] On Behalf Of Rollright--- via Tigers
Sent: Wednesday, November 30, 2016 6:01 PM
To: tigers at autox.team.net
Subject: [Tigers] speedo nylon gear  Hello, How many teeth does the Tiger speedo gear have and what do the colors mean?  Mustangs Unltd. have so many......... I recall some years back the correct one for a Tiger went out of print. Perhaps they are in print again?  Jim Armstrong
382002083
Mk 1A
code 86
TAC # 0763

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