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Which Crown gear? - Printable Version

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Which Crown gear? - Tibbs - 7th-Mar-22

Hi all,
I'm building my next car and have this motor with 9 tooth pinion.
https://www.pendleslotracing.co.uk/scalextric-s-can-motor-drive-shaft-w9848.html

Is there a preference for Crown gear? ie how many teeth to go with 9 tooth pinion?
Cheers

Tony

RE: Which Crown gear? - Kevan - 7th-Mar-22

I'd be starting at 26 but depends on the diameter of your drive tyres as it can drastically affect 'rollout'.

RE: Which Crown gear? - Tibbs - 7th-Mar-22

(7th-Mar-22, 07:04 PM)Kevan Wrote:  I'd be starting at 26 but depends on the diameter of your drive tyres as it can drastically affect 'rollout'.

They will be 20mm x 12mm tyres Kevan

RE: Which Crown gear? - Kevan - 7th-Mar-22

Normal default gear ratios are 3:1 so 27:9 but I always start with longer ratios as it calms a motor down.  26:10 is my preferred start point for any motor really then empirical tuning after that.

RE: Which Crown gear? - Qman - 8th-Mar-22

Depends on the nature of the circuit, long straights = long gearing, tight & twisty = short gearing, raise ratio if track is a slippery one.

So many variables it is impossible to give an answer

RE: Which Crown gear? - Kevan - 8th-Mar-22

I don't change ratios between racing on the circuit and going round our permanent Rally stage.  On a tight/twisty track the car's never going to reach top speed anyway so gearing down doesn't really have any benefit.

RE: Which Crown gear? - Tibbs - 8th-Mar-22

(8th-Mar-22, 03:32 PM)Qman Wrote:  Depends on the nature of the circuit, long straights = long gearing, tight & twisty = short gearing, raise ratio if track is a slippery one.

So many variables it is impossible to give an answer

Sorry, I should of said it's for a home Sport track and a bit of fun.
I don't want it to be a donkey though. Rofl

RE: Which Crown gear? - Savage GT - 16th-Mar-22

As stated, to be similar to most other scalextric/carrera a 27 tooth would be perfect.
To match the likes of Inline slot.it cars, a 28 tooth.

It ia also worth knowing what the motor is, as braking can be effected, but generally a 27/9 is adequate and common for home use.

RE: Which Crown gear? - Savage GT - 16th-Mar-22

As stated, to be similar to most other scalextric/carrera a 27 tooth would be perfect.
To match the likes of Inline slot.it cars, a 28 tooth.