Scratch Build

[redsox985]

Obviously. People are scooping up the last remaining REAL Comet parts like it's black Friday.

 

[r97]

i cant believe people on black Friday, guys get killed/trampled at walll mart after opening the doors, its senseless, get a job and earn the extra cash instead of going to jail for trampling people.

 

[redsox985]

Welcome to America. We'll trample you to death for a tv if it means saving a buck.

 

[r97]

pretty much

 

[aspock]

Roughed out the rear end this afternoon

 

[r97]

is there a key-way for that sprocket to fit into

 

[aspock]

Brake, hubs and sprcket all have keyways

Aidan

 

[r97]

oh, ok i was just saying cause the axle has a key through the left bearing the brake rotor, then the key-way on the axle stops, then about 3" from that you have the sprocket.

 

[dpaxson]

that's just a split keyway. the other one is probably 90º around the shaft

 

[r97]

thats what i figured, but i wasnt sure cause i hant seen a "split key-way" as you say

 

[aspock]

Morning Chaps,

Got a little bit more done yesterday. We re did the engine mount as the motor would have been offset with where it was and we were worried about the torque converter catching on the chassis bars when it spun up and moved inwards.

With that done the chain drive was connected and the engine added and tested - all seems to spin freely, and the motor drives it ok.

Then started on the triangulation and started on the A frame to give rigidity to the rear. Mmmmm............... compound angles, complicated by the fact that the box section isn't square but 30x15mm.

I intend to remove the governer to get more power later but i presune i could also get more speed by increasing the size of the sprocket attached to the first layshaft and or the rear sprocket? is that corrrect?

Aidan

 

[r97]

nice, increasing the size of one of the very small sprockets will increase speed, or you could decrease the size of one of the larger sprockets for more speed.

 

[aspock]

Cool, cheers.

The sprocket mounted to the other end of the torque coverter lay shaft would seem the obivous choice as it is a single and available in a number of sizes at a reasonable cost.

I had fancied doing a mini bike as the next project so using the 6.5hp motor for that and bunging in a 13hp job might be another way

Aidan

 

[redsox985]

Why the extra jack shaft if the TC has one built in?

 

[aspock]

Not sure what you mean Redsox? Are you asking why I have an extra layshaft?

Aidan

 

[fowler]

u have a shaft coming from the tc to a sprocket then a chain to a chain to anouther sprocket on a differant shaft.
why do u have the extra shaft.
i guess u are droping the ratio more?

 

[Silvergrizz]

u have a shaft coming from the tc to a sprocket then a chain to a chain to anouther sprocket on a differant shaft.
why do u have the extra shaft.
i guess u are droping the ratio more?

Fowler, you are correct. That unit is called a reduction unit, used with small engines (under 7HP) pushing rear tires 16" and larger. Using different sprockets will vary the rate of reduction.

 

[r97]

its basically there so off-road karts with big gear reductions don't bottom-out on stuff with a 2' dia sprocket. i have a tc with jack-shaft, then chain comes of of that to second jack-shaft, then to the axle sprocket, i did this so i could re-position where my chain went to the axle sprocket because otherwise i would prob pop a hole in my tires side wall from the chain rubbing it.

 

[Hendersonjk]

Just a thought

I wouldnt say its a have to thing but it probably wouldnt hurt to run another set of bearing clost to the center sprocket also. the torque from the chain might be ruff on the axle with the sprocket in the center. once again just a suggestion. looking great though. waiting on the next post pics already

 

[theo]

I also think that chain will jump teeth without a support bearing.