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Gearing for Group 12


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#1 Ralph Middaugh

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Posted 07 February 2016 - 08:05 AM

I am looking for gearing  starting point for group 12 motor on a 155 ft. king track ?






#2 W. J. Dougherty

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Posted 07 February 2016 - 08:15 AM

10/44
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#3 gmpower

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Posted 07 February 2016 - 11:10 AM

Ralph are they going to start G12 wings at Marks?


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#4 86ed once again

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Posted 07 February 2016 - 02:09 PM

10/44
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#5 garyvmachines

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Posted 07 February 2016 - 03:20 PM

It might be nice to tell him what pitch gears you are running ?????

I don't have any 44t - 64p gears in my box....... & I don't think they will tec. ........  

 

GAV


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#6 W. J. Dougherty

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Posted 07 February 2016 - 03:28 PM

Sorry but almost all wing cars except some 27s and open cars run 72 pitch gears. I don't even think you can get 44s in anything but 72p, except maybe in drag gears... Will try to do better next time...
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#7 Bill from NH

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Posted 07 February 2016 - 04:12 PM

Bill, I have 44-46T, 64 pitch Fass spurs from the 70s before we went to 13/16" rears. :)


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#8 W. J. Dougherty

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Posted 07 February 2016 - 04:16 PM

That's ok but won't work for .750s on modern wing cars...
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#9 Ralph Middaugh

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Posted 07 February 2016 - 05:05 PM

no Greg ,  but if we have 5 or more that want to race them on Sunday he would race them. just  playing around with a motor that I got in a buyout  , Mark don't have any 64p gears above 40 , so I will have to try something else.



#10 Taylor Davis

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Posted 07 February 2016 - 06:17 PM

You can try 9 39 in 64p or 10 44 in 72p. Is this a 72g box car?

#11 Samiam

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Posted 07 February 2016 - 07:17 PM

Is 9/40 64p different in performance from 10/44 72p? Both are 4.4:1 


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#12 Taylor Davis

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Posted 07 February 2016 - 08:23 PM

Is 9/40 64p different in performance from 10/44 72p? Both are 4.4:1 

Good question, really hard to test, some say 72 is faster others say no definite answer.

#13 The Number of

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Posted 08 February 2016 - 09:01 AM

Roll  out with a .765 tire at 10/44 is 5.75 ,at 9/40 5.81/at 8/35 5.72 the 72p gears seem to be better  able to obtain a smoother gear mesh for me.  Bill


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#14 Fast Freddie

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Posted 08 February 2016 - 10:44 AM

Try 9x43 @72P you'll love spinning that small arm up into it's better rpm range, at least I do.  Whether 72P is faster than 64P is a toss up but they are smoother.  I think the reason a lot of racers use the 10x44 @72P is most run on Gerding King tracks and there's virtually no blipping the trigger if you car is set up correctly.  With the 9x43 you generate more rpm and that increases the gyro effect the motor contributes to the cars handling. It also increases the air flow through the motor for better cooling. I usually start out with .770 dia. WX-WXX tires and they'll usually do the whole race.  Mostly use Koford .318 @ 40* arm .535 ag in a Koford Ultra Feather with T-5 magnets. Just my 2 cents worth.


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#15 NY Nick

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Posted 08 February 2016 - 04:45 PM

Fred what body are you using?

I have used 11X44 that was with proslot 38*.


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