[Fot] Gear ratios?

[Ted Schumacher]

Bud, this works for all manual trans. but will use a 4 speed for 
illustration. Lay gear(cluster gear) 4th divided by main shaft 4th X 
whatever main shaft gear you choose divided by laygear equivalent = 
ratio for that gear. Example - laygear 4th is 33 teeth, main shaft 4th 
is 22 teeth. Main shaft 3rd is 27 teeth and lay gear is 29 teeth. So 33 
divided by 22 = 1.5 x 29 divided by 27 (1.08) = 1.61(3rd gear ratio)

Lay gear (direct) divided by main shaft gear (direct)  X what main shaft 
gear you choose divided by equivalent lay gear = ratio for that gear

On 1/10/2018 5:41 PM, Bud R via Fot wrote:
> Listerati,
>
> I’ve been trying to figure out what gear ratios I have in the gearbox that came with my race car but don’t know how to  do the proper math. The PO told me it was a close ratio GT6 gearbox but one never knows until you actual check.
>
> I at least took some “data” while it was out so I’m hoping someone can tell me how to figure out the gear ratios and if it is indeed close ratio GT6 gears or whatever it might be.
>
> When the input shaft was turned one full rotation the output shaft turned the following amount.
>
> 1st gear it turned 1/4 turn
> 2nd gear it  turned 1 1/8 turns
> 3rd gear it turned 1 5/8 turns
> 4th gear it turned 1 3/4 turns
>
> Any help on how I should do the math is appreciated.
>
> Also does anyone know what happened to the minty lamb gearspeed website? It does not appear to be up any longer and I used to play with it a lot. Very useful site that now appears gone.  Waaahhhh.
>
> Thanks
> Bud Rolofson
>
> Extreme Parts Racing (more than just a haircut)
>
> 71TR6 CC57365 (Good 6)
> 71 Spitfire MK IV Race Car #3
> 69 Spitfire MK III (back up FE engine/dinghy car)
> 93 Minnie Winnie Race Support Vehicle
> 77 Z-50A Hardly Davidson Honda Mini-Trail Bike (Triumph Pit Bike)
>
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-- 
Ted Schumacher
tedtsimx at bright.net
http://www.tsimportedautomotive.com
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