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CR102 gearing?


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#1 40degreerake

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Posted 01 October 2022 - 08:57 AM

Can someone please give me a solid starting point for Can-Am gearing on a King?

 

Thanks in advance.


Rick Peller




#2 Racer36

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Posted 01 October 2022 - 09:56 AM

You can’t go too far wrong starting at 12/28. Some flatter kings might want an 11 tooth pinion.


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#3 Bill Seitz

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Posted 01 October 2022 - 01:15 PM

I hear you can burn up a motor with that gearing, so be careful of long runs.



#4 MSwiss

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Posted 01 October 2022 - 01:49 PM

As Dennis alluded to, the style of King and power level has a lot to do with the preferred gearing.

Note, I didn't say voltage, as depending on wiring and available amperage, the voltage number might be a misnomer.

What King do you plan to run the car on?


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#5 Dan Ebert

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Posted 06 October 2022 - 01:55 PM

I have yet to burn up a Motor because of gearing it 12/28.  I have raced CR102's on Chicagoland's King, Port Jeff's King, Mark Model World's King, Speedy's Fastlane's King, Speedzone and NESCR's Orange track.   Probably 2 dozen races or more since the Motor was made Legal. 


GallerymanDan

#6 Tampabay racer

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Posted 17 October 2022 - 02:41 PM

At the Sano 14 I won both can am and pro Gt coupe with a 11-27
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Brian Ambrose


#7 MSwiss

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Posted 17 October 2022 - 06:34 PM

Brian,
Thanks for posting and coming to the race.

I intended to try 11-27, but the car was still 12-28 from the Coupe race and I decided to invest my limited time on cutting out, and mounting a fresh Can Am body for the race.

For those not on FB, here are the results from the two races Brian won;

Mike Swiss
 
Inventor of the Low CG guide flag 4/20/18
IRRA® Components Committee Chairman
Five-time USRA National Champion (two G7, one G27, two G7 Senior)
Two-time G7 World Champion (1988, 1990), eight G7 main appearances
Eight-time G7 King track single lap world record holder

17B West Ogden Ave., Westmont, IL 60559, (708) 203-8003, mikeswiss86@hotmail.com (also my PayPal address)

Note: Send all USPS packages and mail to: 692 Citadel Drive, Westmont, Illinois 60559


#8 MSwiss

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Posted 17 October 2022 - 08:53 PM

My phone battery died in the middle of posting.

Here are the 2 races Brian won 11-27 over Howie, running 12-28.

GTC-PRO (results were unable to be seen long enough to print)
Brian - 310, (almost 311)
Howie - 309

20221015_230638.jpg
Can Am
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Mike Swiss
 
Inventor of the Low CG guide flag 4/20/18
IRRA® Components Committee Chairman
Five-time USRA National Champion (two G7, one G27, two G7 Senior)
Two-time G7 World Champion (1988, 1990), eight G7 main appearances
Eight-time G7 King track single lap world record holder

17B West Ogden Ave., Westmont, IL 60559, (708) 203-8003, mikeswiss86@hotmail.com (also my PayPal address)

Note: Send all USPS packages and mail to: 692 Citadel Drive, Westmont, Illinois 60559


#9 kuni123456

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Posted 23 October 2022 - 08:03 PM

I use 12:27 gear ratio for retro CanAm but I might try 11:27 for running on purple and black lanes. The car is faster using 12:27 gear ratio but the car is slower on purple and black lanes. I race at Piranha Speedway which is a fast king track and have not burned any CR102 motors which are faster than Retro Hawk motors.


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John K. Wakamatsu

#10 MSwiss

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Posted 24 October 2022 - 08:46 AM

John,
Thanks for posting.

In yesterday's race you were in, Duran won running 11-27.

At the weekly Retro race at Port Jeff, last Tuesday, Pat Skeggs won, also running 11-27.

It would seem, on these super-fast tracks, with wide, fast turns, one could take advantage of the higher numeric ratio, across all 8 lanes.

PS - looks like you achieved your dream of 370 laps.

I guess your next dream will be 380 laps. Lol

20221024_083342.jpg
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Mike Swiss
 
Inventor of the Low CG guide flag 4/20/18
IRRA® Components Committee Chairman
Five-time USRA National Champion (two G7, one G27, two G7 Senior)
Two-time G7 World Champion (1988, 1990), eight G7 main appearances
Eight-time G7 King track single lap world record holder

17B West Ogden Ave., Westmont, IL 60559, (708) 203-8003, mikeswiss86@hotmail.com (also my PayPal address)

Note: Send all USPS packages and mail to: 692 Citadel Drive, Westmont, Illinois 60559






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