Gear ratio for a newbie

[danick006]

hey guys completly new to this page so i will make it short. Im building an off road go kart with a 19 hp i rebuilded last month. I got my comet 40 torque converter ready and all im missing is my gear ratio, what should i get for such a big engine? thanks

 

[itsid]

what weight will you move (kart PLUS passengers) and what wheels will you have mounted?
(Wheel diameter of the driven axle)?

'sid

 

[Half-breeder]

what weight will you move (kart PLUS passengers) and what wheels will you have mounted?
(Wheel diameter of the driven axle)?

'sid

... also, what is the top speed you are wanting to be able to have(remember is a go kart), and whats the normal terrain that you'll be wanting to traverse w/ it? Evidently the more treacherous the terrain, the better to have alot more torque, which eats away at the 'topspeed'... but who wants to hit a bump at 40mph?...

 

[danick006]

i have a frame that is around 150 pounds and the wheels are 18 inch ill be the only passenger, im 150, the terrain will be in the open field at my farm so bumpy terrain but im looking to reach around 40 mph if possible

 

[itsid]

If you're sure it's 19hp... 4.6:1 might work

KartInfo by kartcalc.net:

[FONT="Verdana"]
[B][U]KART[/U][/B]
[INDENT][I]RW diameter[/I]: [B] 45.72 cm | 18 in[/B]
[I]Total weight[/I]: [B] 165 kg | 363.76 lbs[/B]
[/INDENT]
[B][U]ENGINE[/U][/B]
[INDENT][I]Original HP[/I]: [B] 19[/B]
[I]Asummed HP[/I]: [B] ~19[/B]
[I]Torque[/I]: [B] 37.58 Nm | 27.72 ft lbf[/B]
[I]RPM[/I]: [B] 3600[/B]
[/INDENT]
[B][U]TRANSMISSION[/U][/B]
[INDENT][I]Final ratio[/I]: [B] 4.6:1[/B]
[I]TC type[/I]: [B]  series 40[/B]
[I]Lowest ratio[/I]: [B] 11.18:1[/B]
[I]Highest ratio[/I]: [B] 4.6:1[/B]
[/INDENT]
[B][U]PERFORMANCE[/U][/B]
[INDENT][I]Max Wheel Torque[/I]: [B] 420.14 Nm | 309.88 ft lbf[/B]
[I]Min Wheel Torque[/I]: [B] 172.87 Nm | 127.5 ft lbf[/B]
[I]Acceleration[/I]: [B] 6.77 m/s² | 22.21 ft/s²[/B]
[I]Top Speed[/I]: [B] 67.45 km/h | 41.91 mph[/B]
[/INDENT]
[/FONT]

barely enough to get you slightly beyond 40mph...
but a lower ratio would cause too much troubles, no matter how big the engine (it's about engagement speed then )

'sid

 

[danick006]

wow thank you will try it out

 

[landuse]

40mph on bumpy terrain is not going to be pleasant at all