[Trident]

Hi All,

May I have your suggestions on how to determine the best size of gears for a high speed track and a technical one?
I believe the rule of thumb is larger gears for high-torque and smaller gears for high-speed, but is there a definite formula I can follow?

Thanks for any help given.

[JohnKing6]

Hi All,

May I have your suggestions on how to determine the best size of gears for a high speed track and a technical one?
I believe the rule of thumb is larger gears for high-torque and smaller gears for high-speed, but is there a definite formula I can follow?

Thanks for any help given.

There's no general rule of thumb - it varies on the track layout, conditions, engine etc. The best thing to do is ask around the people that drive the same track and engine for a starting point. After that, gauge changes based on the max RPM the engine should be doing and change the ratio accordingly - normally you want the engine to be getting up to a little bit below the maximum revs is capable of. It also depends of if you're talking about racing or just driving for fun. If you're just "playing, use a lower gearing to keep stress off the engine, it will last a lot longer

[bong]

Hi All,

May I have your suggestions on how to determine the best size of gears for a high speed track and a technical one?
I believe the rule of thumb is larger gears for high-torque and smaller gears for high-speed, but is there a definite formula I can follow?

Thanks for any help given.

This might be helpful. i used this to correlate my max speed at backstraight at kartright thus 85 is my preference allowing good overtaking at end of straight.Carmona is a high speed track probably guys there might be using 78. cheers

28hp peak at 11500 rpm , max=13,600rpm
rem rpm pinion sproket km per hr
recommended rated rev 12500 11 78 93.7
recommended rated rev 12500 11 82 89.1
recommended rated rev 12500 11 85 86.0
recommended rated rev 12500 11 87 84.0
recommended rated rev 12500 12 78 102.2
recommended rated rev 12500 12 82 97.3
recommended rated rev 12500 12 85 93.8
recommended rated rev 12500 12 87 91.7

rated 28hp peak 11500 11 78 86.2
rated 28hp peak 11500 11 82 82.0
rated 28hp peak 11500 11 85 79.1
rated 28hp peak 11500 11 87 77.3
rated 28hp peak 11500 12 78 94.1
rated 28hp peak 11500 12 82 89.5
rated 28hp peak 11500 12 85 86.3
rated 28hp peak 11500 12 87 84.3


15hp peak at 10,000 , rpm max= 11,500
rem rpm pinion sproket km per hr
yamaha 11000 12 78 90.0
yamaha 11000 12 82 85.6
yamaha 11000 12 85 82.6
yamaha 11000 12 87 80.7
yamaha 11000 11 78 82.5
yamaha 11000 11 82 78.5
yamaha 11000 11 85 75.7
yamaha 11000 11 87 73.9

[Trident]

Thank you Bong and JohnKing6 for the helpful tips!