Comet 40 Series

[robin]

ime thinking about getting a Comet 40 Series to go on my gokart i hace an 11hp
b&s flathead engine would like about 40mph flat out what sort of size sprockets would i need on the axle and the jack shaft is 40mph a good speed or should i expect more or less ?

 

[crazycart]

i'd say 12 tooth on the js and a 60 on the axle,thats what i have on my cart with a 8hp b&s and comet centrifugal and it goes around 35 mph by gps.

 

[robin]

just ordered it am i right in thinking that i need another set of bearings for the jackshaft ? making of road go kart so i would like allot of torque what ratio dose the torque converter make when its flat out ?

 

[crazycart]

not sure about the ratio but i know youll have plenty of torque.

 

[2or3wheels]

is the 40 seriers a cent or torque converter? Id aim for 30 if its an off- road cart.

 

[crazycart]

Its a torque converter.

 

[robin]

yeah i would like bout 35 40 tops but i dunno what ratio the thing is at its hiest geer ?
its an 11hp flat head to

 

[2or3wheels]

i think on the others, the 3-8 hp ones, it was like .9875 to 1 or something like that.

 

[kibble]

Dang, that's almost one to one. I have been wanting to get a torque converter too but didn't want to spend the money. I scored a torque converter off of a scooter at an auto dismantling yard today for $50!!! It probably would have been cheaper but I couldn't remove it completely from the casing and I had to take the whole casing with me.

 

[2or3wheels]

snap where do you find all there deals?

 

[kibble]

I know this is kinda fftopic: but I'm just answering 2 or 3's question.

There's quite a few auto wrecking yards not too far from where I live. Some about 45 minutes away but they sell the parts that you take out for dirt cheap. My friend was looking for a fender for a car that he's fixing up and he got it at the yard for like $25, in really good condition.

This past saturday, we got two 90mm throttle bodies off of some Q45's and an intake manifold to play with and only paid a little over $60 for all. Some of them have motorcycles too, which is where I found the scooter that I took the TC off of. My friend asked how much for a motorcycle engine and tranny, (which would need some work) about $150, they said. The more useless stuff you can take off of what you need, the less you pay. We were thinking of getting a 4 cylinder motorcycle engine sometime and using that for a future kart project. You guys should look into finding auto wrecking yards nearby. You can find some pretty good stuff for using in your karts.

 

[robin]

i can see one big problem with using a TC of a ped the engines turn at 8k pluss, and unles you have acsess to a lathe i think you will have problem mounting it ?

 

[robin]

i can see one big problem with using a TC of a ped the engines turn at 8k pluss, and unles you have acsess to a lathe i think you will have problem mounting it ?

 

[kibble]

Yeah, it is a little different, but I kept the shafts that they attach to so they will require some slight modification to apply them to something.

 

[2or3wheels]

wow talk about thinking ahead.

 

[Pa and Corby]

Tav/ ratios

You will have to go to a series 40 comet Tav , with a 11 hp motor, the series 30 is rated for 8hp max, as far as gear ratio, search the forunms here someone listed ratio info, I found out that I was running a 10 tooth sprocket on my tav and a 60 tooth on my axle, and wanted more torque, I now run a nine tooth sprocket and the 60 on the axle, this combo is a 1.66:1 ratio and she runs nice on the hills around here, and I don't think I lost much top end speed either! try checking comet or hoffcos web sites, they may have some formulas for ya!