Torque Converter Conversion

[Kartman01]

Folks:

I am converting a minibike from a centrifugal clutch to a 20 series torque converter. I need to weld tabs on the frame for the jackshaft.

My question: what is the center to center distance from the engine crankshaft to where the jackshaft needs to be placed for a 20 series torque converter.

Thanks!

 

[panchothedog]

You can buy many sizes of belts to accommodate for different distances. Most kart part sellers have charts that show which belt works with which distance. 30 series converters are a lot more common and if you were to buy the complete set up with mounting plate it is a simple bolt on to the engine and no welding needed. Distance is fixed as Jack shaft is mounted to the
plate and they come with the right size belt.

 

[mustangfrank]

Folks:

I am converting a minibike from a centrifugal clutch to a 20 series torque converter. I need to weld tabs on the frame for the jackshaft.

My question: what is the center to center distance from the engine crankshaft to where the jackshaft needs to be placed for a 20 series torque converter.

Thanks!

Whatever works, you just have to stay within the C2C range of available belts. Is a TAV not an option to avoid adding a jackshaft to the frame?

Comet Drive Belts | Comet Torque Converter Belts | Go Kart Belts (gokartsupply.com)

 

[delray]

Folks:

I am converting a minibike from a centrifugal clutch to a 20 series torque converter. I need to weld tabs on the frame for the jackshaft.

My question: what is the center to center distance from the engine crankshaft to where the jackshaft needs to be placed for a 20 series torque converter.

Thanks!

just add one more thing to your question and you may already know? 20 series driven unit needs to face in..

 

[Kartman01]

You can buy many sizes of belts to accommodate for different distances. Most kart part sellers have charts that show which belt works with which distance. 30 series converters are a lot more common and if you were to buy the complete set up with mounting plate it is a simple bolt on to the engine and no welding needed. Distance is fixed as Jack shaft is mounted to the
plate and they come with the right size belt.

Thanks, much appreciated. I wanted to go with a 20 series as I’m only working with 3 hp.

I’ve not been able to find the belt chart you mention… I’ll keep looking for that. Thanks!

 

[Kartman01]

just add one more thing to your question and you may already know? 20 series driven unit needs to face in.. View attachment 286601

 

[Kartman01]

Thanks delray. When you say the 20 Series ‘needs to face in’, what does that mean? How does that differ from a 30 series? Thanks!

 

[Kartman01]

Whatever works, you just have to stay within the C2C range of available belts. Is a TAV not an option to avoid adding a jackshaft to the frame?

Comet Drive Belts | Comet Torque Converter Belts | Go Kart Belts (gokartsupply.com)

Hi Frank… what is a TAV? Newbie question! Thanks

 

[mustangfrank]

Hi Frank… what is a TAV? Newbie question! Thanks

Torque-a-verter...clutches, backing plate, cover and jackshaft all in one.

 

[ole4]

When Delray said face in he means the ramp mechanism that operated the expanding pulley. Here is a picture of one face in on the frame and below is a tav driven on the plate face out.

 

[Kartman01]

Torque-a-verter...clutches, backing plate, cover and jackshaft all in one.

Ah, got it. Unfortunately I’m doing a restoration and I’m trying to put the bike back to original condition. Thanks for educating me on TAV!

 

[mustangfrank]

Ah, got it. Unfortunately I’m doing a restoration and I’m trying to put the bike back to original condition. Thanks for educating me on TAV!

I'm lost, you are welding tabs on the frame for a jackshaft? Were they cut off the frame at some point?

 

[Kartman01]

I'm lost, you are welding tabs on the frame for a jackshaft? Were they cut off the frame at some point?

Yes, that is correct. This thing has had a hard life…